AZ91B (AZ91B-F, M11912) Magnesium
Magnesium Alloys
Property Overview
Density1.7g/cm³
Elastic Modulus46GPa
Tensile Strength240MPa
Yield Strength160MPa
Brinell Hardness63HB
Maximum Service Temperature130°C
Chemical Composition
NI
0 to 0.030%
MN
0.13 to 0.5%
SI
0 to 0.5%
CU
0 to 0.35%
AL
8.3 to 9.7%
MG
87.9 to 91.2%
ZN
0.35 to 1.0%
Mechanical
Compressive (Crushing) Strength
160 MPa
Elastic (Young's, Tensile) Modulus
46 GPa
Elongation at Break
5.0 %
Fatigue Strength
79 MPa
Poisson's Ratio
0.29
Shear Modulus
18 GPa
Shear Strength
140 MPa
Tensile Strength: Ultimate (UTS)
240 MPa
Tensile Strength: Yield (Proof)
160 MPa
Hardness
Brinell Hardness
63
Rockwell F Hardness
75
Physical
Density
1.7 g/cm 3
Thermal
Latent Heat of Fusion
360 J/g
Maximum Temperature: Mechanical
130 °C
Melting Completion (Liquidus)
600 °C
Melting Onset (Solidus)
470 °C
Specific Heat Capacity
990 J/kg-K
Thermal Conductivity
73 W/m-K
Thermal Diffusivity
42 mm 2 /s
Thermal Expansion
26 µm/m-K
Thermal Shock Resistance
14 points
Electrical
Electrical Conductivity: Equal Volume
11 % IACS
Electrical Conductivity: Equal Weight (Specific)
58 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
11 MJ/m 3
Resilience: Unit (Modulus of Resilience)
280 kJ/m 3
Stiffness to Weight: Axial
15 points
Stiffness to Weight: Bending
69 points
Strength to Weight: Axial
38 points
Strength to Weight: Bending
49 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 67 x 10 3 BTU/lb
Embodied Water
990 L/kg
Embodied Water
990 L/kg 120 gal/lb
Registered Designations & Aliases
AZ91B (AZ91B-F, M11912) MagnesiumAZ91B-FM11912
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