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AZ91B Magnesium vs. Nickel 684

AZ91B magnesium belongs to the magnesium alloys classification, while nickel 684 belongs to the nickel alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, 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 nickel 684.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
310
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
11
Fatigue Strength, MPa 79
390
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
76
Shear Strength, MPa 140
710
Tensile Strength: Ultimate (UTS), MPa 240
1190
Tensile Strength: Yield (Proof), MPa 160
800

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Maximum Temperature: Mechanical, °C 130
1000
Melting Completion (Liquidus), °C 600
1370
Melting Onset (Solidus), °C 470
1320
Specific Heat Capacity, J/kg-K 990
470
Thermal Expansion, µm/m-K 26
13

Otherwise Unclassified Properties

Base Metal Price, % relative 12
75
Density, g/cm3 1.7
8.3
Embodied Carbon, kg CO2/kg material 22
10
Embodied Energy, MJ/kg 160
140
Embodied Water, L/kg 990
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
120
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1610
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 38
40
Strength to Weight: Bending, points 49
30
Thermal Shock Resistance, points 14
34

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
2.5 to 3.3
Boron (B), % 0
0.0030 to 0.010
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0
15 to 20
Cobalt (Co), % 0
13 to 20
Copper (Cu), % 0 to 0.35
0 to 0.15
Iron (Fe), % 0
0 to 4.0
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.75
Molybdenum (Mo), % 0
3.0 to 5.0
Nickel (Ni), % 0 to 0.030
42.7 to 64
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
2.5 to 3.3
Zinc (Zn), % 0.35 to 1.0
0