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AZ91B Magnesium vs. R05240 Alloy

AZ91B magnesium belongs to the magnesium alloys classification, while R05240 alloy belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (15, 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 R05240 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
150
Elongation at Break, % 5.0
25
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 18
57
Tensile Strength: Ultimate (UTS), MPa 240
270
Tensile Strength: Yield (Proof), MPa 160
170

Thermal Properties

Latent Heat of Fusion, J/g 360
210
Specific Heat Capacity, J/kg-K 990
190
Thermal Expansion, µm/m-K 26
6.8

Otherwise Unclassified Properties

Density, g/cm3 1.7
14
Embodied Water, L/kg 990
460

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
59
Resilience: Unit (Modulus of Resilience), kJ/m3 280
90
Stiffness to Weight: Axial, points 15
6.3
Stiffness to Weight: Bending, points 69
13
Strength to Weight: Axial, points 38
5.4
Strength to Weight: Bending, points 49
6.8
Thermal Shock Resistance, points 14
18

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.010
Copper (Cu), % 0 to 0.35
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 0
0 to 0.010
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Molybdenum (Mo), % 0
0 to 0.020
Nickel (Ni), % 0 to 0.030
0 to 0.010
Niobium (Nb), % 0
35 to 42
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.0050
Tantalum (Ta), % 0
57.9 to 65
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
0 to 0.050
Zinc (Zn), % 0.35 to 1.0
0