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AZ91A (AZ91A-F, M11910) Magnesium

AZ91A magnesium is a magnesium alloy. It is typically furnished in the as-fabricated (no temper or treatment) condition. AZ91A is the ASTM designation for this material. M11910 is the UNS number. It has a moderately low electrical conductivity and a moderately low melting temperature relative to other magnesium alloys. The graph bars on the material properties cards below compare AZ91A magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Brinell Hardness

63

Compressive (Crushing) Strength

160 MPa 23 x 103 psi

Elastic (Young's, Tensile) Modulus

46 GPa 6.7 x 106 psi

Elongation at Break

5.0 %

Fatigue Strength

99 MPa 14 x 103 psi

Poisson's Ratio

0.29

Resilience: Ultimate (Unit Rupture Work)

11 MJ/m3

Resilience: Unit (Modulus of Resilience)

280 kJ/m3

Rockwell F Hardness

75

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

140 MPa 20 x 103 psi

Strength to Weight Ratio

140 kN-m/kg

Tensile Strength: Ultimate (UTS)

240 MPa 35 x 103 psi

Tensile Strength: Yield (Proof)

160 MPa 23 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

600 °C 1100 °F

Melting Onset (Solidus)

470 °C 880 °F

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

73 W/m-K 42 BTU/h-ft-°F

Thermal Diffusivity

42 m2/s

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

10 % IACS

Electrical Conductivity: Equal Weight (Specific)

52 % IACS

Otherwise Unclassified Properties

Base Metal Price

12 % relative

Density

1.7 g/cm3 110 lb/ft3

Embodied Carbon

22 kg CO2/kg material

Embodied Energy

160 MJ/kg 68 x 103 BTU/lb

Embodied Water

990 L/kg 120 gal/lb

Alloy Composition

Magnesium (Mg) 88.2 to 91.2
Aluminum (Al) 8.3 to 9.7
Zinc (Zn) 0.35 to 1.0
Manganese (Mn) 0.13 to 0.5
Silicon (Si) 0 to 0.5
Copper (Cu) 0 to 0.1
Nickel (Ni) 0 to 0.030
Iron (Fe) 0 to 0.0050
Residuals 0 to 0.010

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

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.

Welding and Joining of Magnesium Alloys, Liming Liu ed., 2010

ISO 16220: Magnesium and magnesium alloys - Magnesium alloy ingots and castings