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AZ91A Magnesium vs. AWS BNi-5a

AZ91A magnesium belongs to the magnesium alloys classification, while AWS BNi-5a belongs to the nickel alloys. There are 19 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 AZ91A magnesium and the bottom bar is AWS BNi-5a.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
72
Tensile Strength: Ultimate (UTS), MPa 240
480

Thermal Properties

Latent Heat of Fusion, J/g 360
420
Melting Completion (Liquidus), °C 600
1150
Melting Onset (Solidus), °C 470
1070
Specific Heat Capacity, J/kg-K 990
500
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
55
Density, g/cm3 1.7
7.9
Embodied Carbon, kg CO2/kg material 22
9.0
Embodied Energy, MJ/kg 160
130
Embodied Water, L/kg 990
260

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
17
Strength to Weight: Bending, points 49
17
Thermal Shock Resistance, points 14
15

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
0 to 0.050
Boron (B), % 0
1.0 to 1.5
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
18.5 to 19.5
Cobalt (Co), % 0
0 to 0.1
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
70.1 to 73.5
Phosphorus (P), % 0
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 0.5
7.0 to 7.5
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Zinc (Zn), % 0.35 to 1.0
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5