Magnesium alloy AJ62 AJ62
Die-casting alloy, Mg-Al-Sr-Mn: Mg balance, Al 6.3, Sr 2.5, Mn 0.36 wt% (composition of the commercial AJ62 supplied by Magnesium Elektron, Wang et al. 2007)
Also known as AJ62
AJ62 is a die-casting magnesium alloy with about 6 wt% aluminium, 2 to 2.5 wt% strontium and about 0.35 wt% manganese.
Evidence level
2 of 5
Lab-measured
- 0Predicted only. No one has made it, or no measurement exists.
- 1Calculated. Only calculated or predicted values from sources.
- 2Lab-measured. Measured properties with their conditions stated.
- 3Space-relevant tests. Measured in conditions relevant to space, such as vacuum or atomic oxygen.
- 4Ground-qualified. Qualified for an application on the ground.
- 5Flown or field-proven. Flight or field results exist.
Heat treatment
257.6 MPa
Recipe, share of the weight
- Mg balance (the rest)Magnesium
- Al 6.1 wt% in the 2007 sand-cast analysis (mse-aj62-2007); about 6 wt% nominal (Wikipedia)Aluminium
- Sr 2.1 wt% in the 2007 sand-cast analysis; about 2 wt% nominal (Wikipedia)Strontium
- Mn 0.34 wt% in the 2007 sand-cast analysis and on WikipediaManganese
Best for
Die-cast engine and power-train parts that run warm, such as crankcases, transmission cases and oil pans, where creep resistance and castability matter more than the highest strength (the sources name these uses)
Weakest at
Corrosion data are qualitative only (no corrosion rate read for AJ62), and the strength figures come from one 2007 study of one melt rather than a supplier datasheet
Risk at a glance
- People No data. No hazard data recorded
- If it fails Low. Heat-treatment coarsening of the eutectic
- Corrosion No data. No corrosion data recorded
Quick facts: AJ62
| Property | Value | Basis |
|---|---|---|
| Yield strength | 121 to 130 MPa | 3 sourced values across conditions |
| Tensile strength | 225 to 258 MPa | 3 sourced values across conditions |
What is the yield strength of Magnesium alloy AJ62?
Magnesium alloy AJ62 has a yield strength of 121 to 130 MPa. The range covers 3 sourced values across the tempers, forms and test conditions the sources report; room-temperature values are used where a source states a temperature.
What is the tensile strength of Magnesium alloy AJ62?
Magnesium alloy AJ62 has a tensile strength of 225 to 258 MPa. The range covers 3 sourced values across the tempers, forms and test conditions the sources report; room-temperature values are used where a source states a temperature.
What is Magnesium alloy AJ62 used for?
Uses recorded in the sources include Automotive engine crankcase and power-train components; Transmission cases and oil pans (named for AJ62x, the variant the SAE paper describes); Magnesium-aluminium composite engine block (BMW).
Why it exists
AJ62 is a die-casting magnesium alloy whose strontium gives it creep resistance at engine temperatures and good castability. Its strength is modest: as-cast tensile strength is about 225 to 244 MPa in the 2007 study. What it offers is light weight and creep resistance at 150 to 175 °C, which is the reason the sources name engine and transmission parts as its uses.
Where it's used
Engine crankcases and power-train parts
The 2007 sand-cast study says AJ62 is typically used in the automotive industry for engine crankcases and power-train components.
Transmission cases and oil pans
The SAE paper of 2003 positions AJ62x, the variant it describes, for transmission cases and oil pans.
Engine block (with AJ52)
Wikipedia says that AJ52 and AJ62 are both used in the BMW magnesium-aluminium composite engine block.
Recipe
Die-casting alloy, Mg-Al-Sr-Mn: Mg balance, Al 6.3, Sr 2.5, Mn 0.36 wt% (composition of the commercial AJ62 supplied by Magnesium Elektron, Wang et al. 2007); a 2007 sand-cast study measured Al 6.1, Mn 0.34, Sr 2.1 wt%; the Wikipedia nominal is Mg-6Al-2Sr
AJ62 is a magnesium alloy with about 6 wt% aluminium, 2 to 2.5 wt% strontium and about 0.35 wt% manganese. The strontium forms Al4Sr eutectic lamellae, and the 2007 study also found other intermetallic particles in the as-cast structure. The commercial alloy studied in 2007 was made by semisolid rheo-diecasting, and it was also cast by high-pressure die casting for comparison.
| Ingredient | Share of the weight | What it does |
|---|---|---|
| Magnesium Mg | balance (the rest) | The base metal and the balance of the alloy. |
| Aluminium Al | 6.1 wt% in the 2007 sand-cast analysis (mse-aj62-2007); about 6 wt% nominal (Wikipedia) | Main alloying addition; forms the Al4Sr and Mg-Al-Sr phases and sets the solid solution. |
| Strontium Sr | 2.1 wt% in the 2007 sand-cast analysis; about 2 wt% nominal (Wikipedia) | Creep-resistance addition. It forms the Al4Sr eutectic, which the study says is extremely stable up to 450 °C. |
| Manganese Mn | 0.34 wt% in the 2007 sand-cast analysis and on Wikipedia | Minor addition. It forms Al8Mn5 particles, found in the as-cast structure. |
Weight shares are as printed in the sources.
What it can do
Creep at temperature
The SAE abstract says Mg-Al-Sr alloys show superior creep performance at 150 to 175 °C and stress levels of 50 to 70 MPa. The number is qualitative in the abstract; no creep rate for AJ62 was read.
Castability
In a sand-cast spiral test the flow length rose from 38 cm at 695 °C to 57 cm at 755 °C (2007 study).
Heat treatment
257.6 MPa
After 2 h at 450 °C, the rheo-diecast alloy reached 257.6 MPa tensile strength and 12.01 % elongation, against 243.9 MPa and 9.05 % as cast.
How it compares
AJ62 is compared here only with its own process variants. The 2007 study found that rheo-diecasting gave higher strength and much higher ductility than high-pressure die casting of the same alloy (9.05 % against 7.43 % elongation as cast). No other magnesium alloy was compared with AJ62 in a source read in this run.
The same measurements for each material, so you can compare them. Each row names the key condition under the value; the full conditions and methods are in the numbered notes under Technical details. Other materials are shown beside it; each was measured under its own conditions, so open its page before comparing closely. Compare every grade in the family.
| Measurement | AJ62 | AZ31B | Mg | AZ61 | EV31A |
|---|---|---|---|---|---|
| Other measurements | |||||
| Tensile strength, HPDC as cast (F condition) | 225.3 MPa1 | 290 MPa | 140 to 160 MPa | 310 MPa | 248 MPa |
| Yield strength, HPDC as cast (F condition) | 123.5 MPa2 | no data | no data | > 151.7 MPa | 145 MPa |
| Elongation, HPDC as cast (F condition) | 7.43 %3 | 15 % | no data | 16 % | no data |
| Tensile strength, rheo-diecast as cast (F condition) | 243.9 MPa4 | 290 MPa | 140 to 160 MPa | 310 MPa | 248 MPa |
| Yield strength, rheo-diecast as cast (F condition) | 129.8 MPa5 | no data | no data | > 151.7 MPa | 145 MPa |
| Elongation, rheo-diecast as cast (F condition) | 9.05 %6 | 15 % | no data | 16 % | no data |
| Tensile strength, rheo-diecast after heat treatment (2 h at 450 °C) | 257.6 MPa7 | 290 MPa | 140 to 160 MPa | 310 MPa | 248 MPa |
| Yield strength, rheo-diecast after heat treatment (2 h at 450 °C) | 121.4 MPa8 | no data | no data | > 151.7 MPa | 145 MPa |
| Elongation, rheo-diecast after heat treatment (2 h at 450 °C) | 12.01 %9 | 15 % | no data | 16 % | no data |
| Fluidity, sand-cast spiral test, pour at 695 °C | 38 cm10 | no data | no data | no data | no data |
| Fluidity, sand-cast spiral test, pour at 755 °C | 57 cm11 | no data | no data | no data | no data |
Why choose it, and why not
Good for
- Warm engine and power-train castings. The sources name crankcases, transmission cases and oil pans.
- Thin-walled die castings where castability matters. The 2007 study says AJ62 offers good castability and the SAE paper reports hot-tear resistance.
Watch out for
- Strength is modest: 225 to 244 MPa as cast in the 2007 study, with a yield strength of 123.5 to 129.8 MPa.
- Corrosion data are qualitative only. No AJ62 corrosion rate was read.
- Creep figures are qualitative in the abstract; no creep rate or stress exponent was read from a page in this run.
AJ62 is a creep-resistant die-casting magnesium alloy that the sources name for engine and transmission parts. The strength and elongation figures come from one 2007 study, and the properties a designer needs most (density, thermal and corrosion rates) were not found in a page read in this run.
Technical details
For scientists and researchers. Everything above comes from the record below: every number with its method, its conditions and its source.
Other names and standards
The same grade under other systems, as datasheets and standards print them. Each code was checked against the page it comes from.
| System | Codes |
|---|---|
| Name | AJ62 |
Notes
The method, full conditions and any caveat for the numbered rows above.
| # | Measurement | Method | Conditions | Caveat |
|---|---|---|---|---|
| 1 | Tensile strength, HPDC as cast (F condition) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper F (as cast, high-pressure die cast)process high-pressure die casting (HPDC), same alloy lot as the rheo-diecast samplesspread ± 11.3 MPa (printed as mean ± standard deviation)temperature not stated | — |
| 2 | Yield strength, HPDC as cast (F condition) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper F (as cast, high-pressure die cast)process high-pressure die casting (HPDC)spread ± 4.0 MPa (printed as mean ± standard deviation)temperature not stated | — |
| 3 | Elongation, HPDC as cast (F condition) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper F (as cast, high-pressure die cast)process high-pressure die casting (HPDC)spread ± 1.49 % (printed as mean ± standard deviation)temperature not stated | — |
| 4 | Tensile strength, rheo-diecast as cast (F condition) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper F (as cast, rheo-diecast)process semisolid rheo-diecasting (RDC), one-step process from the BCAST groupspread ± 10.4 MPa (printed as mean ± standard deviation)temperature not stated | — |
| 5 | Yield strength, rheo-diecast as cast (F condition) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper F (as cast, rheo-diecast)process semisolid rheo-diecasting (RDC)spread ± 3.4 MPa (printed as mean ± standard deviation)temperature not stated | — |
| 6 | Elongation, rheo-diecast as cast (F condition) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper F (as cast, rheo-diecast)process semisolid rheo-diecasting (RDC)spread ± 1.01 % (printed as mean ± standard deviation)temperature not stated | — |
| 7 | Tensile strength, rheo-diecast after heat treatment (2 h at 450 °C) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper heat treated, 2 h at 450 °C after rheo-diecasting (the paper's row label is "Heat treated")process semisolid rheo-diecasting (RDC)spread ± 7.7 MPa (printed as mean ± standard deviation)temperature not stated | — |
| 8 | Yield strength, rheo-diecast after heat treatment (2 h at 450 °C) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper heat treated, 2 h at 450 °C after rheo-diecastingprocess semisolid rheo-diecasting (RDC)spread ± 5.2 MPa (printed as mean ± standard deviation)temperature not stated | — |
| 9 | Elongation, rheo-diecast after heat treatment (2 h at 450 °C) | Tensile tests on standard test samples in an Instron machine (authors' own runs, this work) | temper heat treated, 2 h at 450 °C after rheo-diecastingprocess semisolid rheo-diecasting (RDC)spread ± 1.06 % (printed as mean ± standard deviation)temperature not stated | — |
| 10 | Fluidity, sand-cast spiral test, pour at 695 °C | Spiral fluidity test, sand mould, flow length read from the spiral casting (not a standard property; snake_case name used, see gaps) | pour temperature 695 °Cmould sand (spiral test) | Not in spores/property-canon.yaml; the snake_case name fluidity_spiral_length is used. |
| 11 | Fluidity, sand-cast spiral test, pour at 755 °C | Spiral fluidity test, sand mould, flow length read from the spiral casting (not a standard property; snake_case name used, see gaps) | pour temperature 755 °Cmould sand (spiral test) | Not in spores/property-canon.yaml; the snake_case name fluidity_spiral_length is used. |
Corrosion and compatibility
What happens when it meets other materials and environments.
| Environment | Concern | What happens |
|---|---|---|
| Salt solutions and engine coolant, potentiodynamic polarization (permanent-mould cast AJ62, fine- and coarse-grained sections) | not rated | Fine-grained AJ62 resisted corrosion better than coarse-grained AJ62 in the same test.1 |
| # | Environment | Details | Test conditions |
|---|---|---|---|
| 1 | Salt solutions and engine coolant, potentiodynamic polarization (permanent-mould cast AJ62, fine- and coarse-grained sections) | The abstract says the permanent-mould cast AJ62 has a fine-grained thin section and a coarse-grained thick section, and that the fine-grained alloy shows enhanced corrosion resistance in the salt solutions and engine coolant tested. The abstract gives no corrosion rate, and the full text was not open, so no number is given here. | method potentiodynamic polarization (electrochemical), not immersion mass losssolutions salt solutions and engine coolant (named in the abstract; concentrations not in the abstract) |
Risks and side effects
Hazards to people, what happens when a cell overheats, and how the material is handled and stored.
For people
No safety data sheet or hazard classification for AJ62 was read in this run, so no hazard statement is given here.
If it fails
The sources read here give little failure data for AJ62 in service.
- Heat treatment
- Annealing at 450 °C coarsens the Al4Sr eutectic. The study reports little change in hardness up to 12 h at 450 °C, and tensile elongation rose from 9.05 % to 12.01 % after 2 h.
- Corrosion
- The one corrosion study read here is qualitative. It reports that a fine-grained AJ62 casting resisted corrosion better than a coarse-grained one in salt solutions and engine coolant.
Test details
The original wording and numbers from the sources, for readers who want them.
Failure risks
| Failure | Trigger and consequence |
|---|---|
| Heat-treatment coarsening of the eutecticlow severity | Annealing at 450 °C (the rheo-diecast study used 2 h at 450 °C, and tested up to 12 h)The Al4Sr eutectic lamellae break up, spheroidise and coarsen; the study reports little change in hardness up to 12 h at 450 °C, while elongation rose to 12.01 %. |
Supply and geography
How common the raw materials are and where they come from.
Magnesium (the base metal), world primary smelter production
USGS: resources for magnesium range from large to virtually unlimited and are globally widespread; magnesium-bearing brines are estimated to be a resource in the billions of tons.
- Top producers (2025)
- China 87.7%, Russia 5.5%, Brazil 1.8%, Israel 1.8%, Turkey 1.4%
- Recycling
- USGS: in 2025 about 26,000 tons of secondary magnesium was recovered from old scrap and 82,000 tons from new scrap (United States figures).
- Substitutes
- USGS: aluminium and zinc may substitute for magnesium in castings and wrought products; magnesium's light weight is an advantage over them in most applications, but its high cost is a disadvantage.
Documents
Datasheets, safety data sheets, papers and standards you can open.
Full record
The complete spore, as stored. Free to reuse under CC-BY-4.0. Images keep the licence shown with each one.
Show the full YAML
spore: profile
id: magnesium-aj62
spore_version: 0.2
family: magnesium-alloys
name: Magnesium alloy AJ62
abbreviation: AJ62
role: die-cast structural alloy
category: metals
type: magnesium
summary: |
AJ62 is a die-casting magnesium alloy with about 6 wt% aluminium, 2 to 2.5 wt% strontium and about 0.35 wt% manganese. Its strontium gives it creep resistance at temperatures up to about 150 to 175 °C, and the alloy is known for castability and hot-tear resistance. A 2007 rheo-diecasting study measured as-cast tensile strength of 225 to 244 MPa and elongation of 7 to 9 %, and 258 MPa and 12 % after a 2 h anneal at 450 °C. The main gap is corrosion: the only corrosion study read here is qualitative, and no density, melting range or thermal property was read from a page in this run.
best_for: Die-cast engine and power-train parts that run warm, such as crankcases, transmission cases and oil pans, where creep resistance and castability matter more than the highest strength (the sources name these uses)
weakest_at: Corrosion data are qualitative only (no corrosion rate read for AJ62), and the strength figures come from one 2007 study of one melt rather than a supplier datasheet
identity:
formula: 'Die-casting alloy, Mg-Al-Sr-Mn: Mg balance, Al 6.3, Sr 2.5, Mn 0.36 wt% (composition of the commercial AJ62 supplied by Magnesium Elektron, Wang et al. 2007); a 2007 sand-cast study measured Al 6.1, Mn 0.34, Sr 2.1 wt%; the Wikipedia nominal is Mg-6Al-2Sr'
designations:
- system: Name
code: AJ62
source: wikipedia-aj-alloys
where: AJ alloys table, AJ62 row (Mg Balance, Al 6, Sr 2, Mn 0.34)
source: wang-2007-rdc-aj62
where: 'Section 2 (Experimental): composition Mg-6.3Al-2.5Sr-0.36Mn; the 2007 sand-cast study (mse-aj62-2007) prints Table 1 with Al 6.1, Mn 0.34, Sr 2.1'
tags:
environments: []
applications:
- structures
properties:
- benchmark: ultimate_tensile_strength
label: Tensile strength, HPDC as cast (F condition)
value: 225.3
unit: MPa
scope: material
conditions:
temper: F (as cast, high-pressure die cast)
process: high-pressure die casting (HPDC), same alloy lot as the rheo-diecast samples
spread: ± 11.3 MPa (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row HPDC (F condition), this work, UTS column
- benchmark: yield_strength
label: Yield strength, HPDC as cast (F condition)
value: 123.5
unit: MPa
scope: material
conditions:
temper: F (as cast, high-pressure die cast)
process: high-pressure die casting (HPDC)
spread: ± 4.0 MPa (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row HPDC (F condition), this work, Yield Strength column
- benchmark: elongation
label: Elongation, HPDC as cast (F condition)
value: 7.43
unit: '%'
scope: material
conditions:
temper: F (as cast, high-pressure die cast)
process: high-pressure die casting (HPDC)
spread: ± 1.49 % (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row HPDC (F condition), this work, Elongation column
- benchmark: ultimate_tensile_strength
label: Tensile strength, rheo-diecast as cast (F condition)
value: 243.9
unit: MPa
scope: material
conditions:
temper: F (as cast, rheo-diecast)
process: semisolid rheo-diecasting (RDC), one-step process from the BCAST group
spread: ± 10.4 MPa (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row RDC (F condition), this work, UTS column
- benchmark: yield_strength
label: Yield strength, rheo-diecast as cast (F condition)
value: 129.8
unit: MPa
scope: material
conditions:
temper: F (as cast, rheo-diecast)
process: semisolid rheo-diecasting (RDC)
spread: ± 3.4 MPa (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row RDC (F condition), this work, Yield Strength column
- benchmark: elongation
label: Elongation, rheo-diecast as cast (F condition)
value: 9.05
unit: '%'
scope: material
conditions:
temper: F (as cast, rheo-diecast)
process: semisolid rheo-diecasting (RDC)
spread: ± 1.01 % (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row RDC (F condition), this work, Elongation column
- benchmark: ultimate_tensile_strength
label: Tensile strength, rheo-diecast after heat treatment (2 h at 450 °C)
value: 257.6
unit: MPa
scope: material
conditions:
temper: heat treated, 2 h at 450 °C after rheo-diecasting (the paper's row label is "Heat treated")
process: semisolid rheo-diecasting (RDC)
spread: ± 7.7 MPa (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row RDC (Heat treated, 2 hrs at 450 °C), UTS column
- benchmark: yield_strength
label: Yield strength, rheo-diecast after heat treatment (2 h at 450 °C)
value: 121.4
unit: MPa
scope: material
conditions:
temper: heat treated, 2 h at 450 °C after rheo-diecasting
process: semisolid rheo-diecasting (RDC)
spread: ± 5.2 MPa (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row RDC (Heat treated, 2 hrs at 450 °C), Yield Strength column
- benchmark: elongation
label: Elongation, rheo-diecast after heat treatment (2 h at 450 °C)
value: 12.01
unit: '%'
scope: material
conditions:
temper: heat treated, 2 h at 450 °C after rheo-diecasting
process: semisolid rheo-diecasting (RDC)
spread: ± 1.06 % (printed as mean ± standard deviation)
temperature: not stated
method: Tensile tests on standard test samples in an Instron machine (authors' own runs, this work)
status: ground
source: wang-2007-rdc-aj62
where: Table 1, row RDC (Heat treated, 2 hrs at 450 °C), Elongation column
- benchmark: fluidity_spiral_length
label: Fluidity, sand-cast spiral test, pour at 695 °C
value: 38
unit: cm
scope: material
conditions:
pour_temperature: 695 °C
mould: sand (spiral test)
method: Spiral fluidity test, sand mould, flow length read from the spiral casting (not a standard property; snake_case name used, see gaps)
status: ground
source: mse-aj62-2007
where: 'Fig. 4 caption: Fluidity length is equal 38 cm (pouring from 695 °C)'
note: Not in spores/property-canon.yaml; the snake_case name fluidity_spiral_length is used.
- benchmark: fluidity_spiral_length
label: Fluidity, sand-cast spiral test, pour at 755 °C
value: 57
unit: cm
scope: material
conditions:
pour_temperature: 755 °C
mould: sand (spiral test)
method: Spiral fluidity test, sand mould, flow length read from the spiral casting (not a standard property; snake_case name used, see gaps)
status: ground
source: mse-aj62-2007
where: 'Fig. 5 caption: Fluidity length is equal 57 cm (pouring from 755 °C); text says flow length rises with pouring temperature'
note: Not in spores/property-canon.yaml; the snake_case name fluidity_spiral_length is used.
corrosion:
- environment: Salt solutions and engine coolant, potentiodynamic polarization (permanent-mould cast AJ62, fine- and coarse-grained sections)
headline: Fine-grained AJ62 resisted corrosion better than coarse-grained AJ62 in the same test.
effect: The abstract says the permanent-mould cast AJ62 has a fine-grained thin section and a coarse-grained thick section, and that the fine-grained alloy shows enhanced corrosion resistance in the salt solutions and engine coolant tested. The abstract gives no corrosion rate, and the full text was not open, so no number is given here.
rating: unknown
conditions:
method: potentiodynamic polarization (electrochemical), not immersion mass loss
solutions: salt solutions and engine coolant (named in the abstract; concentrations not in the abstract)
source: li-aj62-amm-2015
where: Abstract (Scientific.net record, Applied Mechanics and Materials Vol. 865, pp. 9-14)
risks:
hazards: []
failure_risks:
- mode: Heat-treatment coarsening of the eutectic
trigger: Annealing at 450 °C (the rheo-diecast study used 2 h at 450 °C, and tested up to 12 h)
consequence: The Al4Sr eutectic lamellae break up, spheroidise and coarsen; the study reports little change in hardness up to 12 h at 450 °C, while elongation rose to 12.01 %.
severity: low
source: wang-2007-rdc-aj62
where: Abstract; Section 3.3 and Table 1
side_effects: []
handling: []
mitigations: []
uses:
- application: structures
device: Automotive engine crankcase and power-train components
example: The 2007 sand-cast study says AJ62 is typically used in the automotive industry for engine crankcase and power-train components.
source: mse-aj62-2007
where: Abstract (Purpose)
- application: structures
device: Transmission cases and oil pans (named for AJ62x, the variant the SAE paper describes)
example: The SAE paper says that AJ62x, which it describes as the most recent formulation with about 6 % Al and 2 % Sr, is positioned for transmission cases and oil pans.
source: pekguleryuz-saeaj62x-2003
where: Abstract
- application: structures
device: Magnesium-aluminium composite engine block (BMW)
example: Wikipedia says AJ52 and AJ62 are both used in the BMW magnesium-aluminium composite engine block.
source: wikipedia-aj-alloys
where: Last paragraph of the article
supply:
- subject: Magnesium (the base metal), world primary smelter production
abundance: 'USGS: resources for magnesium range from large to virtually unlimited and are globally widespread; magnesium-bearing brines are estimated to be a resource in the billions of tons.'
producers:
- country: China
share_percent: 87.7
year: 2025
- country: Russia
share_percent: 5.5
year: 2025
- country: Brazil
share_percent: 1.8
year: 2025
- country: Israel
share_percent: 1.8
year: 2025
- country: Turkey
share_percent: 1.4
year: 2025
recycling: 'USGS: in 2025 about 26,000 tons of secondary magnesium was recovered from old scrap and 82,000 tons from new scrap (United States figures).'
substitutes:
- 'USGS: aluminium and zinc may substitute for magnesium in castings and wrought products; magnesium''s light weight is an advantage over them in most applications, but its high cost is a disadvantage.'
source: usgs-mcs2026-magnesium-metal
where: World Primary Production and Reserves table, 2025 column (shares calculated by Space Mushroom against the 1,083 thousand t sum of the listed countries, as for AZ31B; world total printed as 1,100 rounded); Recycling; Substitutes
documents:
- title: 'Wang, Liu, Wang and Fan: Microstructural characterisation and thermal stability of an Mg-Al-Sr alloy prepared by rheo-diecasting (Proc. 5th Decennial Int. Conf. on Solidification Processing, Sheffield, 2007)'
type: paper
url: https://bura.brunel.ac.uk/bitstream/2438/2682/1/18-sp07-2.pdf
year: 2007
- title: 'Archives of Materials Science and Engineering, vol. 28, issue 6 (2007): AJ62 casting temperature, fluidity and structure (Wayback copy of the PDF)'
type: paper
url: https://web.archive.org/web/2011/http://www.archivesmse.org/vol28_6/2865.pdf
year: 2007
- title: 'Pekguleryuz, Labelle and Argo: Magnesium Die Casting Alloy AJ62x with Superior Creep Resistance, Ductility and Die Castability (SAE 2003-01-0190)'
type: paper
url: https://saemobilus.sae.org/content/2003-01-0190/
year: 2003
- title: Corrosion Behaviors of Permanent Mold Cast Mg Alloy AJ62 with Varying Grain Structures in Automotive-Related Environments (Applied Mechanics and Materials, vol. 865)
type: paper
url: https://www.scientific.net/AMM.865.9
year: 2015
- title: 'USGS Mineral Commodity Summaries 2026: Magnesium Metal'
type: report
url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-magnesium-metal.pdf
year: 2026
gaps:
- No density, melting range, specific heat, thermal conductivity, thermal expansion or elastic modulus for AJ62 was found in a page read in this run. Search snippets for these were not used.
- No AJ62 creep numbers were read. The SAE 2003 abstract gives only qualitative creep performance (150 to 175 °C, 50 to 70 MPa). The 2020 Journal of Magnesium and Alloys creep paper on AJ62 (DOI 10.1016/j.jma.2020.03.001) was blocked by a bot check on ScienceDirect.
- No AJ62 corrosion rate was read. The 2015 Applied Mechanics and Materials abstract is qualitative and the full text needs institutional access. Chloride immersion data for AJ62 were not found.
- No safety data sheet or PubChem GHS entry for AJ62 or for magnesium was read in this run (PubChem returned a browser check). risks.hazards is therefore empty. Search results on general magnesium and aluminium SDSs were not used as values.
- No UNS, ASTM, AMS or EN designation for AJ62 was found on a page read in this run. The ASTM B951 codification practice was only seen in search results. Variants AJ62x and AJ62Lx are different grades and are not listed as designations.
- Strontium and aluminium supply (USGS) were not read in this run, and the magnesium critical-mineral listing was not checked in this run.
- Failure modes other than heat-treatment coarsening (for example creep failure in service or fatigue) were not found in a source read in this run.
- Fluidity is a sand-cast spiral test, not a standard property; it is kept under the snake_case name fluidity_spiral_length and is not compared with other alloys.
sources:
wang-2007-rdc-aj62:
title: Microstructural characterisation and thermal stability of an Mg-Al-Sr alloy prepared by rheo-diecasting (Wang, Liu, Wang, Fan; BCAST, Brunel University)
id: Proc. 5th Decennial International Conference on Solidification Processing, Sheffield, July 2007, pp. 603 onward
url: https://bura.brunel.ac.uk/bitstream/2438/2682/1/18-sp07-2.pdf
year: 2007
kind: paper
license: Brunel University repository copy, cited and not reproduced
mse-aj62-2007:
title: 'AJ62 magnesium alloy: influence of pouring temperature on fluidity and structure (Archives of Materials Science and Engineering, vol. 28, issue 6)'
id: Archives of Materials Science and Engineering 28(6), June 2007
url: https://web.archive.org/web/2011/http://www.archivesmse.org/vol28_6/2865.pdf
year: 2007
kind: paper
license: Journal copy (Wayback), cited and not reproduced
pekguleryuz-saeaj62x-2003:
title: Magnesium Die Casting Alloy AJ62x with Superior Creep Resistance, Ductility and Die Castability (SAE 2003-01-0190)
id: DOI 10.4271/2003-01-0190; Pekguleryuz, Labelle and Argo, Noranda Inc.
url: https://saemobilus.sae.org/content/2003-01-0190/
year: 2003
kind: paper
license: SAE abstract page read, cited and not reproduced
li-aj62-amm-2015:
title: Corrosion Behaviors of Permanent Mold Cast Mg Alloy AJ62 with Varying Grain Structures in Automotive-Related Environments
id: Applied Mechanics and Materials Vol. 865 (Trans Tech Publications)
url: https://www.scientific.net/AMM.865.9
year: 2015
kind: paper
license: Scientific.net abstract page read, cited and not reproduced
wikipedia-aj-alloys:
title: 'Wikipedia: AJ alloys (composition table, AJ62 row; BMW engine block)'
url: https://en.wikipedia.org/wiki/AJ_alloys
kind: web
license: CC BY-SA (Wikipedia), cited for composition and uses only
usgs-mcs2026-magnesium-metal:
title: 'USGS Mineral Commodity Summaries 2026: Magnesium Metal'
id: USGS MCS 2026, February 2026
url: https://pubs.usgs.gov/periodicals/mcs2026/mcs2026-magnesium-metal.pdf
year: 2026
kind: report
license: US Government work, public domain
license: CC-BY-4.0
updated: '2026-10-26'
review:
status: draft
method: assistant
checked_values: 11
unreachable: 4
caveats: 6
note: 'Written 2026-10-26 from pages fetched in this run. 11 values are sourced: 9 tensile values from one 2007 table (HPDC and rheo-diecast, as cast and heat treated), 2 fluidity values from one 2007 paper. Four pages were blocked (ScienceDirect, PubChem, a Springer record and a DOI redirect). Density and thermal properties were not found.'
story:
recipe:
line: AJ62 is a magnesium alloy with about 6 wt% aluminium, 2 to 2.5 wt% strontium and about 0.35 wt% manganese. The strontium forms Al4Sr eutectic lamellae, and the 2007 study also found other intermetallic particles in the as-cast structure. The commercial alloy studied in 2007 was made by semisolid rheo-diecasting, and it was also cast by high-pressure die casting for comparison.
parts:
- name: Magnesium
symbol: Mg
share_note: balance (the rest)
role: The base metal and the balance of the alloy.
source: wang-2007-rdc-aj62
where: Section 2 (composition Mg-6.3Al-2.5Sr-0.36Mn)
- name: Aluminium
symbol: Al
share_percent: 6.3
share_note: 6.1 wt% in the 2007 sand-cast analysis (mse-aj62-2007); about 6 wt% nominal (Wikipedia)
role: Main alloying addition; forms the Al4Sr and Mg-Al-Sr phases and sets the solid solution.
source: wang-2007-rdc-aj62
where: Section 2 (composition)
- name: Strontium
symbol: Sr
share_percent: 2.5
share_note: 2.1 wt% in the 2007 sand-cast analysis; about 2 wt% nominal (Wikipedia)
role: Creep-resistance addition. It forms the Al4Sr eutectic, which the study says is extremely stable up to 450 °C.
source: wang-2007-rdc-aj62
where: Section 2 (composition); Discussion of heat treatment, before Section 3.3
- name: Manganese
symbol: Mn
share_percent: 0.36
share_note: 0.34 wt% in the 2007 sand-cast analysis and on Wikipedia
role: Minor addition. It forms Al8Mn5 particles, found in the as-cast structure.
source: mse-aj62-2007
where: Table 1 (chemical composition); Findings in abstract
risk_groups:
- title: For people
lead: No safety data sheet or hazard classification for AJ62 was read in this run, so no hazard statement is given here.
points: []
- title: If it fails
lead: The sources read here give little failure data for AJ62 in service.
points:
- label: Heat treatment
line: Annealing at 450 °C coarsens the Al4Sr eutectic. The study reports little change in hardness up to 12 h at 450 °C, and tensile elongation rose from 9.05 % to 12.01 % after 2 h.
- label: Corrosion
line: The one corrosion study read here is qualitative. It reports that a fine-grained AJ62 casting resisted corrosion better than a coarse-grained one in salt solutions and engine coolant.
why: 'AJ62 is a die-casting magnesium alloy whose strontium gives it creep resistance at engine temperatures and good castability. Its strength is modest: as-cast tensile strength is about 225 to 244 MPa in the 2007 study. What it offers is light weight and creep resistance at 150 to 175 °C, which is the reason the sources name engine and transmission parts as its uses.'
uses:
- where: Engine crankcases and power-train parts
line: The 2007 sand-cast study says AJ62 is typically used in the automotive industry for engine crankcases and power-train components.
- where: Transmission cases and oil pans
line: The SAE paper of 2003 positions AJ62x, the variant it describes, for transmission cases and oil pans.
- where: Engine block (with AJ52)
line: Wikipedia says that AJ52 and AJ62 are both used in the BMW magnesium-aluminium composite engine block.
can_do:
- label: Creep at temperature
line: The SAE abstract says Mg-Al-Sr alloys show superior creep performance at 150 to 175 °C and stress levels of 50 to 70 MPa. The number is qualitative in the abstract; no creep rate for AJ62 was read.
- label: Castability
line: In a sand-cast spiral test the flow length rose from 38 cm at 695 °C to 57 cm at 755 °C (2007 study).
- label: Heat treatment
value: 257.6 MPa
line: After 2 h at 450 °C, the rheo-diecast alloy reached 257.6 MPa tensile strength and 12.01 % elongation, against 243.9 MPa and 9.05 % as cast.
compare: AJ62 is compared here only with its own process variants. The 2007 study found that rheo-diecasting gave higher strength and much higher ductility than high-pressure die casting of the same alloy (9.05 % against 7.43 % elongation as cast). No other magnesium alloy was compared with AJ62 in a source read in this run.
compare_rows:
- label: Tensile strength, as cast
benchmark: ultimate_tensile_strength
- label: Yield strength, as cast
benchmark: yield_strength
- label: Elongation, as cast
benchmark: elongation
handling:
- Read a supplier safety data sheet before machining. No AJ62 SDS was read in this run, and magnesium alloy chips and fines are flammable.
- Keep it away from chloride solutions. The one corrosion source read here is qualitative, so no rate is given.
good_for:
- Warm engine and power-train castings. The sources name crankcases, transmission cases and oil pans.
- Thin-walled die castings where castability matters. The 2007 study says AJ62 offers good castability and the SAE paper reports hot-tear resistance.
watch_out:
- 'Strength is modest: 225 to 244 MPa as cast in the 2007 study, with a yield strength of 123.5 to 129.8 MPa.'
- Corrosion data are qualitative only. No AJ62 corrosion rate was read.
- Creep figures are qualitative in the abstract; no creep rate or stress exponent was read from a page in this run.
verdict: AJ62 is a creep-resistant die-casting magnesium alloy that the sources name for engine and transmission parts. The strength and elongation figures come from one 2007 study, and the properties a designer needs most (density, thermal and corrosion rates) were not found in a page read in this run.
References
Every number above carries a reference number. Click one to see the source and where in it the value comes from.