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AZ91E (M11919) Magnesium

AZ91E magnesium is a magnesium alloy. AZ91E is the ASTM designation for this material. M11919 is the UNS number.

The properties of AZ91E magnesium include three common variations. This page shows summary 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 AZ91E 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

75

Compressive (Crushing) Strength

310 to 410 MPa 45 to 60 x 103 psi

Elastic (Young's, Tensile) Modulus

46 GPa 6.7 x 106 psi

Elongation at Break

2.5 to 6.2 %

Fatigue Strength

81 to 85 MPa 12 x 103 psi

Fracture Toughness

13 MPa-m1/2 12 x 103 psi-in1/2

Impact Strength: V-Notched Charpy

0.79 to 2.8 J 0.58 to 2.0 ft-lb

Poisson's Ratio

0.29

Shear Modulus

18 GPa 2.6 x 106 psi

Shear Strength

89 to 150 MPa 13 to 21 x 103 psi

Tensile Strength: Ultimate (UTS)

160 to 260 MPa 23 to 38 x 103 psi

Tensile Strength: Yield (Proof)

96 to 130 MPa 14 to 19 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)

500 °C 930 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

990 J/kg-K 0.24 BTU/lb-°F

Thermal Conductivity

84 W/m-K 49 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

10 to 12 % IACS

Electrical Conductivity: Equal Weight (Specific)

52 to 60 % 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)

3.4 to 12 MJ/m3

Resilience: Unit (Modulus of Resilience)

100 to 190 kJ/m3

Stiffness to Weight: Axial

15 points

Stiffness to Weight: Bending

69 points

Strength to Weight: Axial

25 to 42 points

Strength to Weight: Bending

37 to 53 points

Thermal Diffusivity

49 mm2/s

Thermal Shock Resistance

9.0 to 15 points

Alloy Composition

Magnesium (Mg) 88.8 to 91.3
Aluminum (Al) 8.1 to 9.3
Zinc (Zn) 0.4 to 1.0
Manganese (Mn) 0.17 to 0.35
Silicon (Si) 0 to 0.2
Copper (Cu) 0 to 0.015
Iron (Fe) 0 to 0.0050
Nickel (Ni) 0 to 0.0010
Residuals 0 to 0.3

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

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

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