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AZ91B Magnesium vs. K93500 Alloy

AZ91B magnesium belongs to the magnesium alloys classification, while K93500 alloy belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (14, 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 K93500 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 18
72
Tensile Strength: Ultimate (UTS), MPa 240
490 to 810

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Melting Completion (Liquidus), °C 600
1430
Melting Onset (Solidus), °C 470
1380
Specific Heat Capacity, J/kg-K 990
460
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
30
Density, g/cm3 1.7
8.2
Embodied Carbon, kg CO2/kg material 22
4.7
Embodied Energy, MJ/kg 160
65
Embodied Water, L/kg 990
130

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
23
Strength to Weight: Axial, points 38
17 to 27
Strength to Weight: Bending, points 49
17 to 23
Thermal Shock Resistance, points 14
15 to 25

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.1
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0
0 to 0.25
Cobalt (Co), % 0
5.0
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
61.4 to 63
Magnesium (Mg), % 87.9 to 91.2
0 to 0.1
Manganese (Mn), % 0.13 to 0.5
0 to 0.6
Nickel (Ni), % 0 to 0.030
32
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 0.25
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0.35 to 1.0
0
Zirconium (Zr), % 0
0 to 0.1