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AM100A (M10100) Magnesium

AM100A magnesium is a magnesium alloy. AM100A is the ASTM designation for this material. M10100 is the UNS number. It has a moderately low melting temperature relative to other magnesium alloys in the database.

The properties of AM100A magnesium include five common variations. The property values on this page show ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare AM100A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Elastic (Young's, Tensile) Modulus

46 GPa 6.7 x 106 psi

Elongation at Break

1.0 to 6.8 %

Fatigue Strength

48 to 70 MPa 7.0 to 10 x 103 psi

Poisson's Ratio


Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

150 MPa 22 x 103 psi

Tensile Strength: Ultimate (UTS)

160 to 270 MPa 23 to 39 x 103 psi

Tensile Strength: Yield (Proof)

78 to 140 MPa 11 to 20 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

590 °C 1100 °F

Melting Onset (Solidus)

460 °C 870 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

73 W/m-K 42 BTU/h-ft-°F

Thermal Expansion

25 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

12 % relative


1.7 g/cm3 110 lb/ft3

Embodied Carbon

22 kg CO2/kg material

Embodied Energy

160 MJ/kg 68 x 103 BTU/lb

Embodied Water

1000 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

1.3 to 15 MJ/m3

Resilience: Unit (Modulus of Resilience)

66 to 210 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

70 points

Strength to Weight: Axial

25 to 44 points

Strength to Weight: Bending

38 to 54 points

Thermal Diffusivity

43 m2/s

Thermal Shock Resistance

9.7 to 17 points

Alloy Composition

Magnesium (Mg) 87.9 to 90.6
Aluminum (Al) 9.3 to 10.7
Manganese (Mn) 0.1 to 0.35
Silicon (Si) 0 to 0.3
Zinc (Zn) 0 to 0.3
Copper (Cu) 0 to 0.1
Nickel (Ni) 0 to 0.010
Residuals 0 to 0.3

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

Followup Questions

Similar Alloys

Further Reading

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

Welding and Joining of Magnesium Alloys, Liming Liu ed., 2010

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

ASTM B199: Standard Specification for Magnesium-Alloy Permanent Mold Castings

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