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AS41B (AS41B-F, M10412) Magnesium

AS41B magnesium is a magnesium alloy. It is typically furnished in the as-fabricated (no temper or treatment) condition. AS41B is the ASTM designation for this material. M10412 is the UNS number.

It has a moderately high melting temperature among magnesium alloys. In addition, it has a moderately low tensile strength and a moderately low thermal conductivity.

The graph bars on the material properties cards below compare AS41B magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Elastic (Young's, Tensile) Modulus

45 GPa 6.6 x 106 psi

Elongation at Break

6.0 %

Fatigue Strength

97 MPa 14 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

18 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)

140 MPa 20 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

620 °C 1150 °F

Melting Onset (Solidus)

570 °C 1050 °F

Specific Heat Capacity

1000 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

68 W/m-K 39 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

980 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

11 MJ/m3

Resilience: Unit (Modulus of Resilience)

220 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

72 points

Strength to Weight: Axial

35 points

Strength to Weight: Bending

47 points

Thermal Diffusivity

41 m2/s

Thermal Shock Resistance

13 points

Alloy Composition

Magnesium (Mg) 92.7 to 95.7
Aluminum (Al) 3.5 to 5.0
Silicon (Si) 0.5 to 1.5
Manganese (Mn) 0.35 to 0.7
Zinc (Zn) 0 to 0.12
Copper (Cu) 0 to 0.020
Iron (Fe) 0 to 0.0035
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

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