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AZ91D Magnesium vs. K94200 Alloy

AZ91D magnesium belongs to the magnesium alloys classification, while K94200 alloy belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (13, 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 AZ91D magnesium and the bottom bar is K94200 alloy.

AZ91D (M11916) MagnesiumUNS K94200 (FeNi42, 1.3917) Low Expansion Alloy
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
140
Elongation at Break, % 2.3 to 4.5
5.0 to 32
Poisson's Ratio 0.29
0.34
Shear Modulus, GPa 18
54
Shear Strength, MPa 120 to 140
330 to 410
Tensile Strength: Ultimate (UTS), MPa 160 to 220
500 to 710
Tensile Strength: Yield (Proof), MPa 80 to 130
270 to 650

Thermal Properties

Melting Onset (Solidus), °C 490
1440
Specific Heat Capacity, J/kg-K 990
500
Thermal Conductivity, W/m-K 78
15
Thermal Expansion, µm/m-K 27
5.0

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 58
3.0

Otherwise Unclassified Properties

Density, g/cm3 1.7
8.2

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.2 to 7.7
35 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 69 to 170
250 to 1460
Stiffness to Weight: Axial, points 15
9.8
Stiffness to Weight: Bending, points 69
21
Strength to Weight: Axial, points 26 to 34
17 to 24
Strength to Weight: Bending, points 38 to 46
17 to 22
Thermal Diffusivity, mm2/s 45
3.7
Thermal Shock Resistance, points 9.5 to 13
49 to 70