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AZ91D-T6 Magnesium

AZ91D-T6 magnesium is AZ91D magnesium in the T6 temper. To achieve this temper, the metal is solution heat-treated and artificially aged until it meets standard mechanical property requirements. It has the lowest ductility compared to the other variants of AZ91D magnesium.

The graph bars on the material properties cards below compare AZ91D-T6 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

80

Compressive (Crushing) Strength

430 MPa 62 x 103 psi

Elastic (Young's, Tensile) Modulus

46 GPa 6.7 x 106 psi

Elongation at Break

2.3 %

Fatigue Strength

74 MPa 11 x 103 psi

Impact Strength: V-Notched Charpy

2.7 J 2.0 ft-lb

Poisson's Ratio

0.29

Rockwell F Hardness

75

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

120 MPa 17 x 103 psi

Tensile Strength: Ultimate (UTS)

210 MPa 30 x 103 psi

Tensile Strength: Yield (Proof)

130 MPa 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

350 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

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 MJ/m3

Resilience: Unit (Modulus of Resilience)

170 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

69 points

Strength to Weight: Axial

33 points

Strength to Weight: Bending

45 points

Thermal Diffusivity

45 mm2/s

Thermal Shock Resistance

12 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

Further Reading

ASTM B94: Standard Specification for Magnesium-Alloy Die Castings

Essential Readings in Magnesium Technology, Suveen N. Mathaudhu et al. (editors), 2014

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

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