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Nickel 685 vs. ZK51A Magnesium

Nickel 685 belongs to the nickel alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (5, 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 nickel 685 and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 17
4.7
Fatigue Strength, MPa 470
62
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
18
Shear Strength, MPa 770
160
Tensile Strength: Ultimate (UTS), MPa 1250
240
Tensile Strength: Yield (Proof), MPa 850
150

Thermal Properties

Latent Heat of Fusion, J/g 320
340
Maximum Temperature: Mechanical, °C 1000
120
Melting Completion (Liquidus), °C 1380
640
Melting Onset (Solidus), °C 1330
550
Specific Heat Capacity, J/kg-K 460
970
Thermal Conductivity, W/m-K 13
110
Thermal Expansion, µm/m-K 12
26

Otherwise Unclassified Properties

Base Metal Price, % relative 75
13
Density, g/cm3 8.4
1.8
Embodied Carbon, kg CO2/kg material 10
24
Embodied Energy, MJ/kg 140
160
Embodied Water, L/kg 340
940

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
10
Resilience: Unit (Modulus of Resilience), kJ/m3 1820
260
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
64
Strength to Weight: Axial, points 42
36
Strength to Weight: Bending, points 31
47
Thermal Diffusivity, mm2/s 3.3
61
Thermal Shock Resistance, points 37
15

Alloy Composition

Aluminum (Al), % 1.2 to 1.6
0
Boron (B), % 0.0030 to 0.010
0
Carbon (C), % 0.030 to 0.1
0
Chromium (Cr), % 18 to 21
0
Cobalt (Co), % 12 to 15
0
Copper (Cu), % 0 to 0.5
0 to 0.1
Iron (Fe), % 0 to 2.0
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 3.5 to 5.0
0
Nickel (Ni), % 49.6 to 62.5
0 to 0.010
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.75
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 2.8 to 3.3
0
Zinc (Zn), % 0.020 to 0.12
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3