Magnesium Alloy AZ92A-T4
Temper
ASTM AZ92A · UNS M11920
T4 = solution heat treated and naturally aged
Choose when maximum ductility, toughness and shock resistance are needed from an AZ92A casting.
Values for the T4 condition
Other AZ92A tempers and conditions
AZ92A is listed in 5 conditions; see the grade overview at AZ92A.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As fabricated | Lowest-cost as-cast condition for lightly stressed, dimensionally stable parts; low ductility. | 97 | 172 | 2 | 65 HB | 73 W/m·K |
T4This page Solution heat treated and naturally aged | Choose when maximum ductility, toughness and shock resistance are needed from an AZ92A casting. | 97 | 275 | 10 | 63 HB | 63 W/m·K |
Cooled from hot working and artificially aged | Cheap stabilising age straight from the mould: slightly higher yield and hardness than F, minimal distortion, but very low elongation. | 103 | 172 | 1 | 69 HB | 75 W/m·K |
T6Default Solution heat treated and artificially aged | Standard high-strength condition: best combination of yield strength, hardness and pressure tightness for structural AZ92A castings. | 145 | 275 | 3 | 84 HB | 72 W/m·K |
T6 variant, underaged | Quench-assisted T6 variant used when a faster ageing cycle and slightly higher hardness are required on thick sand castings. | 150 | 275 | 2 | 84 HB | 11.5 % IACS |
What is AZ92A-T4?
AZ92A-T4 is AZ92A in the T4 temper — choose when maximum ductility, toughness and shock resistance are needed from an AZ92A casting. AZ92A-T4 has a yield strength of 97 MPa (14.1 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 90% of magnesium alloy grades. Elongation at break is 10% and the elastic modulus is 45 GPa (6.53 Msi). AZ92A-T4 has a density of 1.82 g/cm³ (0.0658 lb/in³), heavier than 74% of magnesium alloy grades. It melts at 443°C (829 °F). T6 is the default condition FabDigit quotes; T4 is available on request or by drawing note.
Limitations
- Low electrical conductivity — 11.5 % IACS, worse than 92% of magnesium alloy grades
- Low strength — 97 MPa (14.1 ksi), worse than 90% of magnesium alloy grades
- Poor heat conductor — 63 W/m·K (36.4 BTU/hr·ft·°F), worse than 86% of magnesium alloy grades
- Limited service temperature — 120°C (248 °F), worse than 78% of magnesium alloy grades
AZ92A-T4 properties
Typical room-temperature values for AZ92A-T4; 12 are specific to this condition. Other listed values are AZ92A reference data and may not represent this condition. Bars are the position among magnesium alloy grades.
Physical3
AZ92A-T4 has a density of 1.82 g/cm³ (0.0658 lb/in³), heavier than 74% of magnesium alloy grades. It melts at 443°C (829 °F).
Mechanical13
AZ92A-T4 has a yield strength of 97 MPa (14.1 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 90% of magnesium alloy grades. Elongation at break is 10% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
AZ92A-T4 is rated for continuous service to 120°C (248 °F). It conducts heat at 63 W/m·K (36.4 BTU/hr·ft·°F), worse than 86% of magnesium alloy grades. Thermal expansion is 26 µm/m·K (14.4 µin/in·°F).
Electrical3
AZ92A-T4 conducts electricity at 11.5 % IACS, worse than 92% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (22/100), worse than 57% of magnesium alloy grades.
Sustainability4
Producing a kilogram of AZ92A-T4 takes about 350 MJ of energy and emits 30 kg of CO₂ — more than 74% of magnesium alloy grades. Typical recycled content is 25%.
Manufacturability8
AZ92A-T4's machinability is excellent (96/100, better than 87% of magnesium alloy grades); weldability good (65/100); formability not recommended (10/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with AZ92A-T4
Is AZ92A easy to machine?
Outstanding machinability at high speed with sharp positive-rake tools and light or no coolant — but fine chips/dust are a fire hazard, keep dry (never water-based mist), collect chips in covered steel bins and have Class D extinguisher on hand.
Can AZ92A be welded?
GTAW/GMAW in argon with AZ92A filler (also the standard filler for AZ91/AZ63 repairs); preheat thick sections, avoid restraint to prevent hot cracking and stress-relieve or re-age after welding.
Can AZ92A be formed, bent or molded?
A casting alloy only — sand, permanent-mould and plaster casting with good fluidity and pressure tightness; use SF6-free cover gas (SO₂/HFC-134a), generous risering because of high solidification shrinkage; not cold formable.
What surface finishes work on AZ92A?
Not sulphuric-anodizable: apply chromate/chrome-free conversion coat, Dow 17/HAE or PEO anodic coating, then epoxy primer and topcoat; electrically isolate from steel, aluminium and copper fasteners to prevent galvanic attack.
AZ92A chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Al | 8.3 – 9.7 | 9 |
| Zn | 1.6 – 2.4 | 2 |
| Mn0.10 % min required for corrosion control | 0.1 – 0.35 | 0.15 |
| Si | ≤ 0.3 | — |
| Cu | ≤ 0.25 | — |
| Ni | ≤ 0.01 | — |
| Fehigh-purity limit; older specs allow more | ≤ 0.01 | — |
| Others (each)total 0.30 % max | ≤ 0.1 | — |
| Mg | balance | — |
AZ92A-T4 — frequently asked
What is AZ92A-T4 used for?
AZ92A-T4 is typically used for pressure-tight sand castings, industrial gearbox and pump housings, filler rod for AZ91 and AZ63 weld repair, permanent-mold machine components, plaster-cast tooling and prototype hardware and load-bearing equipment brackets. In short: hardest AZ-series casting alloy; pressure-tight sand castings; standard magnesium filler alloy.
What is the yield strength of AZ92A-T4?
AZ92A-T4 has a typical yield strength of 97 MPa (14.1 ksi) and a tensile strength of 275 MPa (39.9 ksi) — weaker than 90% of magnesium alloy grades. Strength varies by condition: see the 5 listed tempers.
Is AZ92A-T4 easy to machine?
Yes — machinability is rated excellent (96/100, better than 87% of magnesium alloy grades). Outstanding machinability at high speed with sharp positive-rake tools and light or no coolant — but fine chips/dust are a fire hazard, keep dry (never water-based mist), collect chips in covered steel bins and have Class D extinguisher on hand.
Can AZ92A-T4 be welded?
Yes — weldability is rated good (65/100). GTAW/GMAW in argon with AZ92A filler (also the standard filler for AZ91/AZ63 repairs); preheat thick sections, avoid restraint to prevent hot cracking and stress-relieve or re-age after welding.
What surface finishes work on AZ92A-T4?
Not sulphuric-anodizable: apply chromate/chrome-free conversion coat, Dow 17/HAE or PEO anodic coating, then epoxy primer and topcoat; electrically isolate from steel, aluminium and copper fasteners to prevent galvanic attack.
Can AZ92A-T4 be formed, bent or molded?
A casting alloy only — sand, permanent-mould and plaster casting with good fluidity and pressure tightness; use SF6-free cover gas (SO₂/HFC-134a), generous risering because of high solidification shrinkage; not cold formable.
What is the maximum service temperature of AZ92A-T4?
AZ92A-T4 is rated for continuous use to about 120°C (248 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between AZ92A-T6 and AZ92A-F?
T6 is the default condition — standard high-strength condition: best combination of yield strength, hardness and pressure tightness for structural AZ92A castings. F: lowest-cost as-cast condition for lightly stressed, dimensionally stable parts; low ductility. Yield strength is 145 MPa in T6 versus 97 MPa in F.
Sources
- ASTM B80 — Magnesium-Alloy Sand Castings — ASTM International (2015)
- ASTM B199 — Magnesium-Alloy Permanent Mold Castings — ASTM International (2019)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- ASM Specialty Handbook: Magnesium and Magnesium Alloys — ASM International (1999)
- ASTM D1732 — Preparation of Magnesium Alloy Surfaces for Painting — ASTM International (2019)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.