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AM50A (AM50A-F, M10500) Magnesium

AM50A magnesium is a magnesium alloy. It is typically furnished in the as-fabricated (no temper or treatment) condition. AM50A is the ASTM designation for this material. M10500 is the UNS number. It has a fairly high ductility among magnesium alloys. In addition, it has a moderately high melting temperature and a moderately low thermal conductivity. The graph bars on the material properties cards below compare AM50A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Brinell Hardness

58

Elastic (Young's, Tensile) Modulus

45 GPa 6.5 x 106 psi

Elongation at Break

11 %

Fatigue Strength

70 MPa 10 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

17 GPa 2.5 x 106 psi

Shear Strength

120 MPa 18 x 103 psi

Tensile Strength: Ultimate (UTS)

210 MPa 30 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 17 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

620 °C 1140 °F

Melting Onset (Solidus)

570 °C 1050 °F

Specific Heat Capacity

1000 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

65 W/m-K 38 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

1.7 g/cm3 100 lb/ft3

Embodied Carbon

23 kg CO2/kg material

Embodied Energy

160 MJ/kg 68 x 103 BTU/lb

Embodied Water

990 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

19 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

71 points

Strength to Weight: Axial

35 points

Strength to Weight: Bending

47 points

Thermal Diffusivity

39 m2/s

Thermal Shock Resistance

13 points

Alloy Composition

Magnesium (Mg) 93.7 to 95.3
Aluminum (Al) 4.4 to 5.4
Manganese (Mn) 0.26 to 0.6
Zinc (Zn) 0 to 0.22
Silicon (Si) 0 to 0.1
Copper (Cu) 0 to 0.010
Iron (Fe) 0 to 0.0040
Nickel (Ni) 0 to 0.0020

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

Followup Questions

Similar Alloys

Further Reading

ASTM B94: Standard Specification for Magnesium-Alloy Die Castings

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

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