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AZ91A (AZ91A-F, M11910) Magnesium

AZ91A magnesium is a magnesium alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. AZ91A is the ASTM designation for this material. M11910 is the UNS number.

It has a very low electrical conductivity and a moderately low melting temperature among magnesium alloys.

The graph bars on the material properties cards below compare AZ91A 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

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

Rockwell F Hardness

75

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

140 MPa 20 x 103 psi

Tensile Strength: Ultimate (UTS)

240 MPa 35 x 103 psi

Tensile Strength: Yield (Proof)

160 MPa 23 x 103 psi

Thermal Properties

Latent Heat of Fusion

360 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

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 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

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

11 MJ/m3

Resilience: Unit (Modulus of Resilience)

280 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

69 points

Strength to Weight: Axial

38 points

Strength to Weight: Bending

49 points

Thermal Diffusivity

42 mm2/s

Thermal Shock Resistance

14 points

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

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

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

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.

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