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AZ91A Magnesium vs. AWS E320

AZ91A magnesium belongs to the magnesium alloys classification, while AWS E320 belongs to the iron alloys. There are 20 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 AZ91A magnesium and the bottom bar is AWS E320.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Elongation at Break, % 5.0
34
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
77
Tensile Strength: Ultimate (UTS), MPa 240
620

Thermal Properties

Latent Heat of Fusion, J/g 360
300
Melting Completion (Liquidus), °C 600
1410
Melting Onset (Solidus), °C 470
1360
Specific Heat Capacity, J/kg-K 990
460
Thermal Expansion, µm/m-K 26
14

Otherwise Unclassified Properties

Base Metal Price, % relative 12
38
Density, g/cm3 1.7
8.2
Embodied Carbon, kg CO2/kg material 22
6.5
Embodied Energy, MJ/kg 160
91
Embodied Water, L/kg 990
220

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
21
Strength to Weight: Bending, points 49
20
Thermal Shock Resistance, points 14
16

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
19 to 21
Copper (Cu), % 0 to 0.1
3.0 to 4.0
Iron (Fe), % 0
31.8 to 43.5
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.5 to 2.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0 to 0.030
32 to 36
Niobium (Nb), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 0.6
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0.35 to 1.0
0