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EV31A (EV31A-T6, M12310) Magnesium

EV31A magnesium is a magnesium alloy. It is typically furnished in the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. EV31A is the ASTM designation for this material. M12310 is the UNS number.

It has a very high melting temperature among magnesium alloys. In addition, it has a moderately low ductility and a moderately high thermal conductivity.

The graph bars on the material properties cards below compare EV31A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Brinell Hardness

70

Compressive (Crushing) Strength

360 MPa 52 x 103 psi

Elastic (Young's, Tensile) Modulus

44 GPa 6.4 x 106 psi

Elongation at Break

3.5 %

Fatigue Strength

120 MPa 17 x 103 psi

Fracture Toughness

15 MPa-m1/2 13650 psi-in1/2

Poisson's Ratio

0.27

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

170 MPa 25 x 103 psi

Tensile Strength: Ultimate (UTS)

260 MPa 38 x 103 psi

Tensile Strength: Yield (Proof)

170 MPa 25 x 103 psi

Thermal Properties

Melting Onset (Solidus)

590 °C 1100 °F

Specific Heat Capacity

1000 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

86 W/m-K 50 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Other Material Properties

Density

1.8 g/cm3 110 lb/ft3

Electrical Conductivity: Equal Volume

18 % IACS

Electrical Conductivity: Equal Weight (Specific)

90 % IACS

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

8.1 MJ/m3

Resilience: Unit (Modulus of Resilience)

330 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

65 points

Strength to Weight: Axial

40 points

Strength to Weight: Bending

50 points

Thermal Diffusivity

47 m2/s

Thermal Shock Resistance

16 points

Followup Questions

Further Reading

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