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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 relative to other magnesium alloys.

The properties of AZ92A magnesium include four 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 AZ92A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Elastic (Young's, Tensile) Modulus

47 GPa 6.8 x 106 psi

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

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

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: 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 m2/s

Thermal Shock Resistance

10 to 16 points

Alloy Composition

Magnesium (Mg) 86.7 to 90
Aluminum (Al) 8.3 to 9.7
Zinc (Zn) 1.6 to 2.4
Manganese (Mn) 0.1 to 0.35
Silicon (Si) 0 to 0.3
Copper (Cu) 0 to 0.25
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 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.