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AZ91A Magnesium vs. ASTM A182 Grade F122

AZ91A magnesium belongs to the magnesium alloys classification, while ASTM A182 grade F122 belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 ASTM A182 grade F122.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
220
Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 5.0
23
Fatigue Strength, MPa 99
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
76
Shear Strength, MPa 140
450
Tensile Strength: Ultimate (UTS), MPa 240
710
Tensile Strength: Yield (Proof), MPa 160
450

Thermal Properties

Latent Heat of Fusion, J/g 360
270
Maximum Temperature: Mechanical, °C 130
600
Melting Completion (Liquidus), °C 600
1490
Melting Onset (Solidus), °C 470
1440
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 73
24
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
10
Electrical Conductivity: Equal Weight (Specific), % IACS 52
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
12
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 22
3.0
Embodied Energy, MJ/kg 160
44
Embodied Water, L/kg 990
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
140
Resilience: Unit (Modulus of Resilience), kJ/m3 280
520
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 38
25
Strength to Weight: Bending, points 49
22
Thermal Diffusivity, mm2/s 42
6.4
Thermal Shock Resistance, points 14
19

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.020
Boron (B), % 0
0 to 0.0050
Carbon (C), % 0
0.070 to 0.14
Chromium (Cr), % 0
10 to 11.5
Copper (Cu), % 0 to 0.1
0.3 to 1.7
Iron (Fe), % 0
81.3 to 87.7
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.7
Molybdenum (Mo), % 0
0.25 to 0.6
Nickel (Ni), % 0 to 0.030
0 to 0.5
Niobium (Nb), % 0
0.040 to 0.1
Nitrogen (N), % 0
0.040 to 0.1
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.5
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Tungsten (W), % 0
1.5 to 2.5
Vanadium (V), % 0
0.15 to 0.3
Zinc (Zn), % 0.35 to 1.0
0
Zirconium (Zr), % 0
0 to 0.010