# 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 10 ^{3} psi*

Elastic (Young's, Tensile) Modulus

44 *GPa* 6.4 *x 10 ^{6} psi*

Elongation at Break

3.5 *%*

Fatigue Strength

120 *MPa* 17 *x 10 ^{3} psi*

Fracture Toughness

15 *MPa-m ^{1/2}* 14

*x 10*

^{3}psi-in^{1/2}Poisson's Ratio

0.27

Shear Modulus

17 *GPa* 2.5 *x 10 ^{6} psi*

Shear Strength

170 *MPa* 25 *x 10 ^{3} psi*

Tensile Strength: Ultimate (UTS)

260 *MPa* 38 *x 10 ^{3} psi*

Tensile Strength: Yield (Proof)

170 *MPa* 25 *x 10 ^{3} 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/cm ^{3}* 110

*lb/ft*

^{3}Electrical Conductivity: Equal Volume

18 *% IACS*

Electrical Conductivity: Equal Weight (Specific)

90 *% IACS*

## Common Calculations

Resilience: Ultimate (Unit Rupture Work)

8.1 *MJ/m ^{3}*

Resilience: Unit (Modulus of Resilience)

330 *kJ/m ^{3}*

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 *mm ^{2}/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