AZ81A (M11810) Magnesium

AZ81A magnesium is an alloy of magnesium. AZ81A is the ASTM designation for this material. M11810 is the UNS number.

It has two common variants, each represented as a separate material. The Material Properties section below shows ranges encompassing all variants. For more specific values, follow the links in the Variant Materials section.

Material Properties

Base Metal Price20 % rel

Brinell Hardness55

Compressive (Crushing) Strength310 to 370 MPa (45 to 54 x 103 psi)

Density1.9 g/cm3 (120 lb/ft3)

Elastic (Young's, Tensile) Modulus44 GPa (6.4 x 106 psi)

Electrical Conductivity13 % IACS

Electrical Resistivity Order of Magnitude-7 10x Ω-m

Elongation at Break3.0 to 8.8 %

Fatigue Strength (Endurance Limit)71 to 73 MPa (10 to 11 x 103 psi)

Melting Onset (Solidus)500 °C (930 °F)

Modulus of Resilience (Unit Resilience)80 to 82 kJ/m3

Poisson's Ratio0.29

Solidification (Pattern Maker's) Shrinkage1.3 %

Specific Heat Capacity1000 J/kg-K

Strength to Weight Ratio84 to 130 kN-m/kg

Tensile Strength: Ultimate (UTS)160 to 240 MPa (23 to 35 x 103 psi)

Tensile Strength: Yield (Proof)84 to 85 MPa (12 x 103 psi)

Thermal Conductivity84 W/m-K

Thermal Diffusivity44 m2/s

Thermal Expansion27 µm/m-K

Unit Rupture Work (Ultimate Resilience)4.0 to 4.1 MJ/m3

The length of each bar compares the given value to the highest value in the database.

Alloy Composition

Magnesium (Mg)89.8 to 92.5 %

Aluminum (Al)7.0 to 8.1 %

Zinc (Zn)0.4 to 1.0 %

Manganese (Mn)0.13 to 0.35 %

Residuals0 to 0.3 %

Silicon (Si)0 to 0.3 %

Copper (Cu)0 to 0.1 %

Nickel (Ni)0 to 0.010 %

Further Reading

ASTM B199: Standard Specification for Magnesium-Alloy Permanent Mold Castings

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993

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