AZ92A (M11920) Magnesium
AZ92A magnesium is a magnesium alloy. AZ92A is the ASTM designation for this material. M11920 is the UNS number. It can have a fairly low thermal conductivity and has a very low melting temperature among magnesium alloys.
The properties of AZ92A magnesium include four common variations. This page shows summary 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 AZ92A 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
Elastic (Young's, Tensile) Modulus
47 GPa 6.8 x 106 psi
Elongation at Break
2.1 to 6.8 %
Fatigue Strength
76 to 90 MPa 11 to 13 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
18 GPa 2.6 x 106 psi
Shear Strength
97 to 160 MPa 14 to 23 x 103 psi
Tensile Strength: Ultimate (UTS)
170 to 270 MPa 25 to 39 x 103 psi
Tensile Strength: Yield (Proof)
83 to 140 MPa 12 to 21 x 103 psi
Thermal Properties
Latent Heat of Fusion
350 J/g
Maximum Temperature: Mechanical
130 °C 270 °F
Melting Completion (Liquidus)
590 °C 1100 °F
Melting Onset (Solidus)
440 °C 830 °F
Solidification (Pattern Maker's) Shrinkage
1.3 %
Specific Heat Capacity
980 J/kg-K 0.23 BTU/lb-°F
Thermal Conductivity
44 to 58 W/m-K 26 to 34 BTU/h-ft-°F
Thermal Expansion
26 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
11 to 12 % IACS
Electrical Conductivity: Equal Weight (Specific)
53 to 62 % IACS
Otherwise Unclassified Properties
Base Metal Price
12 % relative
Density
1.8 g/cm3 110 lb/ft3
Embodied Carbon
22 kg CO2/kg material
Embodied Energy
160 MJ/kg 67 x 103 BTU/lb
Embodied Water
980 L/kg 120 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
4.0 to 14 MJ/m3
Resilience: Unit (Modulus of Resilience)
73 to 220 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
67 points
Strength to Weight: Axial
26 to 41 points
Strength to Weight: Bending
38 to 51 points
Thermal Diffusivity
25 to 33 mm2/s
Thermal Shock Resistance
10 to 16 points
Alloy Composition
| Mg | 86.7 to 90 | |
| Al | 8.3 to 9.7 | |
| Zn | 1.6 to 2.4 | |
| Mn | 0.1 to 0.35 | |
| Si | 0 to 0.3 | |
| Cu | 0 to 0.25 | |
| Ni | 0 to 0.010 | |
| res. | 0 to 0.3 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B199: Standard Specification for Magnesium-Alloy Permanent Mold Castings
ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings
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
Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.