Magnesium Alloy AZ92A-T5
Temper
ASTM AZ92A · UNS M11920
T5 = 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.
Values for the T5 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 |
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 |
T5This page 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-T5?
AZ92A-T5 is AZ92A in the T5 temper — cheap stabilising age straight from the mould: slightly higher yield and hardness than F, minimal distortion, but very low elongation. AZ92A-T5 has a yield strength of 103 MPa (14.9 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 87% of magnesium alloy grades. Elongation at break is 1% and the elastic modulus is 45 GPa (6.53 Msi). AZ92A-T5 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; T5 is available on request or by drawing note.
Limitations
- Limited ductility — 1%, worse than 100% of magnesium alloy grades
- Low electrical conductivity — 11.5 % IACS, worse than 92% of magnesium alloy grades
- Low strength — 103 MPa (14.9 ksi), worse than 87% of magnesium alloy grades
AZ92A-T5 properties
Typical room-temperature values for AZ92A-T5; 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-T5 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-T5 has a yield strength of 103 MPa (14.9 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 87% of magnesium alloy grades. Elongation at break is 1% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
AZ92A-T5 is rated for continuous service to 150°C (302 °F). It conducts heat at 75 W/m·K (43.3 BTU/hr·ft·°F), worse than 59% of magnesium alloy grades. Thermal expansion is 26 µm/m·K (14.4 µin/in·°F).
Electrical3
AZ92A-T5 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-T5 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-T5's machinability is excellent (97/100, better than 92% of magnesium alloy grades); weldability good (60/100); 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-T5
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-T5 — frequently asked
What is AZ92A-T5 used for?
AZ92A-T5 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-T5?
AZ92A-T5 has a typical yield strength of 103 MPa (14.9 ksi) and a tensile strength of 172 MPa (24.9 ksi) — weaker than 87% of magnesium alloy grades. Strength varies by condition: see the 5 listed tempers.
Is AZ92A-T5 easy to machine?
Yes — machinability is rated excellent (97/100, better than 92% 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-T5 be welded?
Yes — weldability is rated good (60/100). 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-T5?
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-T5 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-T5?
AZ92A-T5 is rated for continuous use to about 150°C (302 °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.