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AZ31C (AZ31C-F, M11312) Magnesium

AZ31C magnesium is a magnesium alloy. 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. It has a fairly high ductility and a very high thermal conductivity relative to other magnesium alloys. The graph bars on the material properties cards below compare AZ31C magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Elastic (Young's, Tensile) Modulus

45 GPa 6.5 x 106 psi

Elongation at Break

12 %

Fatigue Strength

150 MPa 22 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

130 MPa 19 x 103 psi

Tensile Strength: Ultimate (UTS)

260 MPa 37 x 103 psi

Tensile Strength: Yield (Proof)

200 MPa 29 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

600 °C 1120 °F

Melting Onset (Solidus)

540 °C 1010 °F

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

130 W/m-K 72 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

19 % IACS

Electrical Conductivity: Equal Weight (Specific)

98 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

1.7 g/cm3 110 lb/ft3

Embodied Carbon

23 kg CO2/kg material

Embodied Energy

160 MJ/kg 67 x 103 BTU/lb

Embodied Water

970 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

28 MJ/m3

Resilience: Unit (Modulus of Resilience)

440 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

70 points

Strength to Weight: Axial

42 points

Strength to Weight: Bending

53 points

Thermal Diffusivity

74 m2/s

Thermal Shock Resistance

16 points

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
Silicon (Si) 0 to 0.1
Copper (Cu) 0 to 0.1
Nickel (Ni) 0 to 0.030
Residuals 0 to 0.3

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

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.

Welding and Joining of Magnesium Alloys, Liming Liu ed., 2010