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EV31A (EV31A-T6, M12310) Magnesium

EV31A magnesium is a magnesium alloy. Cited properties are appropriate for 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 and a moderately low ductility among magnesium alloys.

The graph bars on the material properties cards below compare EV31A magnesium to other magnesium alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

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 14 x 103 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

Maximum Temperature: Mechanical

200 °C 390 °F

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

Essential Readings in Magnesium Technology, Suveen N. Mathaudhu et al. (editors), 2014

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015