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AZ91A Magnesium vs. R05255 Alloy

AZ91A magnesium belongs to the magnesium alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (13, 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 AZ91A magnesium and the bottom bar is R05255 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
20
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
70
Tensile Strength: Ultimate (UTS), MPa 240
540
Tensile Strength: Yield (Proof), MPa 160
450

Thermal Properties

Latent Heat of Fusion, J/g 360
140
Specific Heat Capacity, J/kg-K 990
140
Thermal Conductivity, W/m-K 73
59
Thermal Expansion, µm/m-K 26
6.6

Otherwise Unclassified Properties

Density, g/cm3 1.7
17
Embodied Water, L/kg 990
630

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
100
Resilience: Unit (Modulus of Resilience), kJ/m3 280
530
Stiffness to Weight: Axial, points 15
6.3
Stiffness to Weight: Bending, points 69
11
Strength to Weight: Axial, points 38
9.1
Strength to Weight: Bending, points 49
8.9
Thermal Diffusivity, mm2/s 42
25
Thermal Shock Resistance, points 14
31

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.010
Copper (Cu), % 0 to 0.1
0
Hydrogen (H), % 0
0 to 0.0015
Iron (Fe), % 0
0 to 0.010
Magnesium (Mg), % 88.2 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
0 to 0.5
Nitrogen (N), % 0
0 to 0.010
Oxygen (O), % 0
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.0050
Tantalum (Ta), % 0
95.9 to 98
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
2.0 to 3.5
Zinc (Zn), % 0.35 to 1.0
0