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AZ91A Magnesium vs. Nickel 686

AZ91A magnesium belongs to the magnesium alloys classification, while nickel 686 belongs to the nickel alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 nickel 686.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
220
Elongation at Break, % 5.0
51
Fatigue Strength, MPa 99
410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
77
Shear Strength, MPa 140
560
Tensile Strength: Ultimate (UTS), MPa 240
780
Tensile Strength: Yield (Proof), MPa 160
350

Thermal Properties

Latent Heat of Fusion, J/g 360
320
Maximum Temperature: Mechanical, °C 130
980
Melting Completion (Liquidus), °C 600
1380
Melting Onset (Solidus), °C 470
1340
Specific Heat Capacity, J/kg-K 990
420
Thermal Conductivity, W/m-K 73
9.8
Thermal Expansion, µm/m-K 26
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
1.4
Electrical Conductivity: Equal Weight (Specific), % IACS 52
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
70
Density, g/cm3 1.7
9.0
Embodied Carbon, kg CO2/kg material 22
12
Embodied Energy, MJ/kg 160
170
Embodied Water, L/kg 990
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
320
Resilience: Unit (Modulus of Resilience), kJ/m3 280
280
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
22
Strength to Weight: Axial, points 38
24
Strength to Weight: Bending, points 49
21
Thermal Diffusivity, mm2/s 42
2.6
Thermal Shock Resistance, points 14
21

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.010
Chromium (Cr), % 0
19 to 23
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0
0 to 5.0
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.75
Molybdenum (Mo), % 0
15 to 17
Nickel (Ni), % 0 to 0.030
49.5 to 63
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.080
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0
0.020 to 0.25
Tungsten (W), % 0
3.0 to 4.4
Zinc (Zn), % 0.35 to 1.0
0