AZ31C (AZ31C-F, M11312) Magnesium

AZ31C magnesium is an alloy of magnesium. It is typically furnished in the as-fabricated (no temper or treatment) condition. AZ31C is the ASTM designation for this material. M11312 is the UNS number.

Material Properties

Base Metal Price20 % rel

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

Elastic (Young's, Tensile) Modulus45 GPa (6.5 x 106 psi)

Elongation at Break11 %

Fatigue Strength (Endurance Limit)120 MPa (17 x 103 psi)

Modulus of Resilience (Unit Resilience)360 kJ/m3

Poisson's Ratio0.29

Shear Strength130 MPa (19 x 103 psi)

Specific Heat Capacity990 J/kg-K

Strength to Weight Ratio130 kN-m/kg

Tensile Strength: Ultimate (UTS)250 MPa (36 x 103 psi)

Tensile Strength: Yield (Proof)180 MPa (26 x 103 psi)

Thermal Conductivity1.3 W/m-K

Thermal Diffusivity0.69 m2/s

Thermal Expansion26 µm/m-K

Unit Rupture Work (Ultimate Resilience)25 MJ/m3

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

Alloy Composition

Magnesium (Mg)93.4 to 97 %

Aluminum (Al)2.4 to 3.6 %

Zinc (Zn)0.5 to 1.5 %

Manganese (Mn)0.15 to 1.0 %

Residuals0 to 0.3 %

Copper (Cu)0 to 0.1 %

Silicon (Si)0 to 0.1 %

Nickel (Ni)0 to 0.030 %

Further Reading

ASTM B107: Standard Specification for Magnesium-Alloy Extruded Bars, Rods, Profiles, Tubes, and Wire

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

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