Magnesium Alloy AS41A
ASTM AS41A · UNS M10410
AS41A is an Mg-Al-Si high-pressure die-casting alloy (UNS M10410) in which Mg2Si precipitates raise creep resistance above the AZ and AM series at moderate temperature.
Reference datasheet — AS41A is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the F condition
AS41A tempers and conditions
AS41A is supplied in one standard condition, F. F is the default FabDigit quotes; the values on this page are for it.
What is AS41A?
AS41A is an Mg-Al-Si high-pressure die-casting alloy (UNS M10410) in which Mg2Si precipitates raise creep resistance above the AZ and AM series at moderate temperature. As cast (F) it provides about 140 MPa yield, 225 MPa tensile, 6% elongation and 75 HB, with 68 W/m·K thermal conductivity and service to about 150 °C, and it machines at magnesium speeds (score 95). The silicon addition lowers fluidity, so minimum walls are thicker and cycles slower than AZ91D; weldability is poor (35) on porous castings and bare corrosion resistance is low (25). Rare-earth alloys such as AE42 are the usual step up for hotter creep duty. AS41A has a density of 1.77 g/cm³ (0.0639 lb/in³), lighter than 86% of magnesium alloy grades. It melts at 565°C (1,049 °F). AS41A has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 225 MPa (32.6 ksi) — weaker than 61% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi).
What is AS41A used for?
- Engine components
- Transmission housings
- Oil pans and sumps
- Air-cooled engine crankcase covers
- Powertrain brackets near heat sources
- Compressor housings
Limitations
- Poor heat conductor — 68 W/m·K (39.3 BTU/hr·ft·°F), worse than 81% of magnesium alloy grades
- Difficult to weld — 35/100, worse than 80% of magnesium alloy grades
AS41A properties
Typical room-temperature values for AS41A-F; bars are the position among magnesium alloy grades.
Physical3
AS41A has a density of 1.77 g/cm³ (0.0639 lb/in³), lighter than 86% of magnesium alloy grades. It melts at 565°C (1,049 °F).
Mechanical13
AS41A has a yield strength of 140 MPa (20.3 ksi) and a tensile strength of 225 MPa (32.6 ksi) — weaker than 61% of magnesium alloy grades. Elongation at break is 6% and the elastic modulus is 45 GPa (6.53 Msi).
Thermal6
AS41A is rated for continuous service to 150°C (302 °F). It conducts heat at 68 W/m·K (39.3 BTU/hr·ft·°F), worse than 81% of magnesium alloy grades. Thermal expansion is 26.1 µm/m·K (14.5 µin/in·°F).
Electrical3
AS41A conducts electricity at 19 % IACS, better than 53% of magnesium alloy grades.
Chemical & Environmental3
Corrosion resistance is poor (25/100), better than 64% of magnesium alloy grades.
Sustainability4
Producing a kilogram of AS41A takes about 320 MJ of energy and emits 27 kg of CO₂ — less than 74% of magnesium alloy grades. Typical recycled content is 30%.
Manufacturability8
AS41A's machinability is excellent (95/100, better than 54% of magnesium alloy grades); weldability fair (35/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the magnesium alloy family
Yield strength against density for every magnesium alloy grade FabDigit runs. AS41A is highlighted; hover a dot for its name, or open the interactive family chart.
Working with AS41A
Is AS41A easy to machine?
Cuts extremely fast at high speed with low power and sharp positive-rake tools; keep chips coarse, avoid fine dry dust and use non-aqueous coolant to control fire risk.
Can AS41A be welded?
GTAW with AZ61/AZ92 filler is possible on clean sections, but die-cast porosity causes gas blowout — mechanical fastening or adhesive bonding is preferred for repairs.
Can AS41A be formed, bent or molded?
Hot-chamber/cold-chamber HPDC only; the Mg2Si-forming Si reduces fluidity and die soldering tolerance, so expect slightly slower cycles and thicker minimum walls than AZ91D.
AS41A 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 | 3.7 – 4.8 | 4.2 |
| Siforms Mg2Si for creep resistance | 0.6 – 1.4 | 1 |
| Mn | 0.22 – 0.48 | 0.35 |
| Zn | ≤ 0.1 | |
| CuAS41B high-purity limits Cu to 0.015 | ≤ 0.06 | |
| NiAS41B: 0.001 max | ≤ 0.03 | |
| FeAS41B: 0.0035 max | ≤ 0.04 | |
| Others (each) | ≤ 0.01 | |
| Mg | balance |
What surface finishes work on AS41A?
Chromate-free conversion coat or anodize (Dow 17/HAE/PEO) plus an epoxy or powder topcoat is mandatory for corrosion service; insulate stainless/steel fasteners to prevent galvanic attack.
Equivalent designations
Standards and trade names that resolve to Magnesium Alloy AS41A in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- M10410
- Also called
- AS41A-F
How much does AS41A cost?
AS41A is a standard-cost magnesium alloy ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
AS41A — frequently asked
What is AS41A used for?
AS41A is typically used for engine components, transmission housings, oil pans and sumps, air-cooled engine crankcase covers, powertrain brackets near heat sources and compressor housings. In short: creep-resistant die-cast magnesium; service to 150 °C; fills slower than AZ91D.
What is the yield strength of AS41A?
AS41A has a typical yield strength of 140 MPa (20.3 ksi) and a tensile strength of 225 MPa (32.6 ksi) — weaker than 61% of magnesium alloy grades.
Is AS41A easy to machine?
Yes — machinability is rated excellent (95/100, better than 54% of magnesium alloy grades). Cuts extremely fast at high speed with low power and sharp positive-rake tools; keep chips coarse, avoid fine dry dust and use non-aqueous coolant to control fire risk.
Can AS41A be welded?
With care — weldability is rated fair (35/100). GTAW with AZ61/AZ92 filler is possible on clean sections, but die-cast porosity causes gas blowout — mechanical fastening or adhesive bonding is preferred for repairs.
What surface finishes work on AS41A?
Chromate-free conversion coat or anodize (Dow 17/HAE/PEO) plus an epoxy or powder topcoat is mandatory for corrosion service; insulate stainless/steel fasteners to prevent galvanic attack.
Can AS41A be formed, bent or molded?
Hot-chamber/cold-chamber HPDC only; the Mg2Si-forming Si reduces fluidity and die soldering tolerance, so expect slightly slower cycles and thicker minimum walls than AZ91D.
What is the maximum service temperature of AS41A?
AS41A is rated for continuous use to about 150°C (302 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does AS41A cost?
AS41A is a standard-cost magnesium alloy ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASTM B94 – Standard Specification for Magnesium-Alloy Die Castings — ASTM International (2018)
- ASTM B93/B93M – Magnesium Alloys in Ingot Form for Sand, Permanent Mold, and Die Castings — ASTM International (2020)
- ASM Specialty Handbook: Magnesium and Magnesium Alloys — ASM International (1999)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.