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AZ91B Magnesium vs. Nickel 690

AZ91B magnesium belongs to the magnesium alloys classification, while nickel 690 belongs to the nickel alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 690.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
90
Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
3.4 to 34
Fatigue Strength, MPa 79
180 to 300
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
79
Shear Strength, MPa 140
420 to 570
Tensile Strength: Ultimate (UTS), MPa 240
640 to 990
Tensile Strength: Yield (Proof), MPa 160
250 to 760

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Maximum Temperature: Mechanical, °C 130
1010
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 470
1340
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
14
Thermal Expansion, µm/m-K 26
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 58
1.6

Otherwise Unclassified Properties

Base Metal Price, % relative 12
50
Density, g/cm3 1.7
8.3
Embodied Carbon, kg CO2/kg material 22
8.2
Embodied Energy, MJ/kg 160
120
Embodied Water, L/kg 990
290

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
31 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 280
160 to 1440
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
21 to 33
Strength to Weight: Bending, points 49
20 to 27
Thermal Diffusivity, mm2/s 42
3.5
Thermal Shock Resistance, points 14
16 to 25

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
27 to 31
Copper (Cu), % 0 to 0.35
0 to 0.5
Iron (Fe), % 0
7.0 to 11
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.5
Nickel (Ni), % 0 to 0.030
58 to 66
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0.35 to 1.0
0