AZ91D (M11916) Magnesium
Magnesium Alloys
Property Overview
Density1.7g/cm³
Elastic Modulus46GPa
Tensile Strength160 to 220MPa
Yield Strength80 to 130MPa
Brinell Hardness60 to 80HB
Maximum Service Temperature130°C
Chemical Composition
NI
0 to 0.0020%
MN
0.15 to 0.5%
SI
0 to 0.1%
CU
0 to 0.030%
AL
8.3 to 9.7%
MG
88.7 to 91.2%
ZN
0.35 to 1.0%
FE
0 to 0.0050%
Mechanical
Compressive (Crushing) Strength
310 to 430 MPa
Elastic (Young's, Tensile) Modulus
46 GPa
Elongation at Break
2.3 to 4.5 %
Fatigue Strength
74 to 85 MPa
Impact Strength: V-Notched Charpy
2.7 J
Poisson's Ratio
0.29
Shear Modulus
18 GPa
Shear Strength
120 to 140 MPa
Tensile Strength: Ultimate (UTS)
160 to 220 MPa
Tensile Strength: Yield (Proof)
80 to 130 MPa
Hardness
Brinell Hardness
60 to 80
Rockwell F Hardness
75
Physical
Density
1.7 g/cm 3
Thermal
Latent Heat of Fusion
350 J/g
Maximum Temperature: Mechanical
130 °C
Melting Completion (Liquidus)
600 °C
Melting Onset (Solidus)
490 °C
Specific Heat Capacity
990 J/kg-K
Thermal Conductivity
78 W/m-K
Thermal Diffusivity
45 mm 2 /s
Thermal Expansion
27 µm/m-K
Thermal Shock Resistance
9.5 to 13 points
Electrical
Electrical Conductivity: Equal Volume
11 % IACS
Electrical Conductivity: Equal Weight (Specific)
58 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
4.2 to 7.7 MJ/m 3
Resilience: Unit (Modulus of Resilience)
69 to 170 kJ/m 3
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
Environmental
Base Metal Price
12 % relative
Embodied Carbon
22 kg CO 2 /kg material
Embodied Energy
160 MJ/kg
Embodied Energy
160 MJ/kg 68 x 10 3 BTU/lb
Embodied Water
990 L/kg
Embodied Water
990 L/kg 120 gal/lb
Registered Designations & Aliases
AZ91D (M11916) MagnesiumM11916
Standards
ASTM B94 ASTM B94: Standard Specification for Magnesium-Alloy Die Castings
ASTM B94 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. 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