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AZ91B Magnesium vs. Type 4 Magnetic Alloy

AZ91B magnesium belongs to the magnesium alloys classification, while Type 4 magnetic alloy belongs to the nickel alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 Type 4 magnetic alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
2.0 to 40
Fatigue Strength, MPa 79
220 to 400
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
73
Shear Strength, MPa 140
420 to 630
Tensile Strength: Ultimate (UTS), MPa 240
620 to 1100
Tensile Strength: Yield (Proof), MPa 160
270 to 1040

Thermal Properties

Latent Heat of Fusion, J/g 360
290
Maximum Temperature: Mechanical, °C 130
900
Melting Completion (Liquidus), °C 600
1420
Melting Onset (Solidus), °C 470
1370
Specific Heat Capacity, J/kg-K 990
440
Thermal Expansion, µm/m-K 26
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 58
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 12
60
Density, g/cm3 1.7
8.8
Embodied Carbon, kg CO2/kg material 22
10
Embodied Energy, MJ/kg 160
140
Embodied Water, L/kg 990
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
22 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 280
190 to 2840
Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
22
Strength to Weight: Axial, points 38
19 to 35
Strength to Weight: Bending, points 49
18 to 27
Thermal Shock Resistance, points 14
21 to 37

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
0 to 0.3
Cobalt (Co), % 0
0 to 0.5
Copper (Cu), % 0 to 0.35
0 to 0.3
Iron (Fe), % 0
9.5 to 17.5
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.8
Molybdenum (Mo), % 0
3.5 to 6.0
Nickel (Ni), % 0 to 0.030
79 to 82
Phosphorus (P), % 0
0 to 0.010
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.020
Zinc (Zn), % 0.35 to 1.0
0