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AZ91C-T4 Magnesium

AZ91C-T4 magnesium is AZ91C magnesium in the T4 temper. To achieve this temper, the metal is solution heat-treated and naturally aged. It has the highest ductility compared to the other variants of AZ91C magnesium. The graph bars on the material properties cards below compare AZ91C-T4 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

Elastic (Young's, Tensile) Modulus

46 GPa 6.7 x 106 psi

Elongation at Break

7.9 %

Fatigue Strength

85 MPa 12 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

160 MPa 23 x 103 psi

Tensile Strength: Ultimate (UTS)

270 MPa 38 x 103 psi

Tensile Strength: Yield (Proof)

83 MPa 12 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)

470 °C 870 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

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

9.9 % 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 67 x 103 BTU/lb

Embodied Water

990 L/kg 120 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

16 MJ/m3

Resilience: Unit (Modulus of Resilience)

75 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

69 points

Strength to Weight: Axial

43 points

Strength to Weight: Bending

53 points

Thermal Diffusivity

43 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Magnesium (Mg) 88.6 to 91.4
Aluminum (Al) 8.1 to 9.3
Zinc (Zn) 0.4 to 1.0
Manganese (Mn) 0.13 to 0.35
Silicon (Si) 0 to 0.3
Copper (Cu) 0 to 0.1
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

Further Reading

ASTM B199: Standard Specification for Magnesium-Alloy Permanent Mold Castings

ASTM B403: Standard Specification for Magnesium-Alloy Investment Castings

ASTM B80: Standard Specification for Magnesium-Alloy Sand Castings

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

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015