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AZ91D (M11916) Magnesium

AZ91D magnesium is a magnesium alloy. AZ91D is the ASTM designation for this material. M11916 is the UNS number. It can have a moderately low tensile strength relative to other magnesium alloys in the database.

The properties of AZ91D magnesium include three 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 AZ91D magnesium to other magnesium alloys (top) and the entire database (bottom).

Mechanical Properties

Brinell Hardness

60 to 80

Compressive (Crushing) Strength

310 to 430 MPa 45 to 62 x 103 psi

Elastic (Young's, Tensile) Modulus

46 GPa 6.7 x 106 psi

Elongation at Break

2.3 to 4.5 %

Fatigue Strength

74 to 85 MPa 11 to 12 x 103 psi

Poisson's Ratio

0.29

Rockwell F Hardness

75

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

120 to 140 MPa 17 to 20 x 103 psi

Tensile Strength: Ultimate (UTS)

160 to 220 MPa 23 to 31 x 103 psi

Tensile Strength: Yield (Proof)

80 to 130 MPa 12 to 18 x 103 psi

Thermal Properties

Melting Completion (Liquidus)

600 °C 1100 °F

Melting Onset (Solidus)

490 °C 920 °F

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

78 W/m-K 45 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

58 % 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)

4.2 to 7.7 MJ/m3

Resilience: Unit (Modulus of Resilience)

69 to 170 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

69 points

Strength to Weight: Axial

26 to 34 points

Strength to Weight: Bending

38 to 46 points

Thermal Diffusivity

45 m2/s

Thermal Shock Resistance

9.5 to 13 points

Alloy Composition

Magnesium (Mg) 88.7 to 91.2
Aluminum (Al) 8.3 to 9.7
Zinc (Zn) 0.35 to 1.0
Manganese (Mn) 0.15 to 0.5
Silicon (Si) 0 to 0.1
Copper (Cu) 0 to 0.030
Iron (Fe) 0 to 0.0050
Nickel (Ni) 0 to 0.0020

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

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.

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993