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 mm2/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