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AZ91B Magnesium vs. ASTM B780 Alloy

AZ91B magnesium belongs to the magnesium alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is AZ91B magnesium and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
83
Elongation at Break, % 5.0
1.1 to 9.1
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 18
30
Shear Strength, MPa 140
200 to 340
Tensile Strength: Ultimate (UTS), MPa 240
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 360
140
Specific Heat Capacity, J/kg-K 990
270
Thermal Expansion, µm/m-K 26
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 58
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 1.7
10

Common Calculations

Stiffness to Weight: Axial, points 15
4.5
Stiffness to Weight: Bending, points 69
14
Strength to Weight: Axial, points 38
9.1 to 16
Strength to Weight: Bending, points 49
11 to 15
Thermal Shock Resistance, points 14
16 to 29

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 0 to 0.35
23.5 to 25.7
Iron (Fe), % 0
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0.35 to 0.65
Silicon (Si), % 0 to 0.5
0
Silver (Ag), % 0
74 to 76
Zinc (Zn), % 0.35 to 1.0
0 to 0.060