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AZ81A-F Magnesium

AZ81A-F magnesium is AZ81A magnesium in the as-fabricated (no temper or treatment) condition. The graph bars on the material properties cards below compare AZ81A-F 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

55

Compressive (Crushing) Strength

310 MPa 45 x 103 psi

Elastic (Young's, Tensile) Modulus

46 GPa 6.6 x 106 psi

Elongation at Break

3.0 %

Fatigue Strength

80 MPa 12 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

91 MPa 13 x 103 psi

Tensile Strength: Ultimate (UTS)

160 MPa 23 x 103 psi

Tensile Strength: Yield (Proof)

84 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

350 J/g

Maximum Temperature: Mechanical

130 °C 260 °F

Melting Completion (Liquidus)

600 °C 1120 °F

Melting Onset (Solidus)

500 °C 940 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

84 W/m-K 49 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

12 % IACS

Electrical Conductivity: Equal Weight (Specific)

65 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

1.7 g/cm3 110 lb/ft3

Embodied Carbon

23 kg CO2/kg material

Embodied Energy

160 MJ/kg 67 x 103 BTU/lb

Embodied Water

990 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

4.0 MJ/m3

Resilience: Unit (Modulus of Resilience)

77 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

70 points

Strength to Weight: Axial

26 points

Strength to Weight: Bending

38 points

Thermal Diffusivity

50 mm2/s

Thermal Shock Resistance

9.1 points

Alloy Composition

Magnesium (Mg)Mg 89.8 to 92.5
Aluminum (Al)Al 7.0 to 8.1
Zinc (Zn)Zn 0.4 to 1.0
Manganese (Mn)Mn 0.13 to 0.35
Silicon (Si)Si 0 to 0.3
Copper (Cu)Cu 0 to 0.1
Nickel (Ni)Ni 0 to 0.010
Residualsres. 0 to 0.3

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

Followup Questions

Further Reading

Welding and Joining of Magnesium Alloys, Liming Liu (editor), 2010

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

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

Advanced Materials in Automotive Engineering, Jason Rowe (editor), 2012

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