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
| Mg | 89.8 to 92.5 | |
| Al | 7.0 to 8.1 | |
| Zn | 0.4 to 1.0 | |
| Mn | 0.13 to 0.35 | |
| Si | 0 to 0.3 | |
| Cu | 0 to 0.1 | |
| Ni | 0 to 0.010 | |
| res. | 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