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AZ61A Magnesium vs. ASTM A387 Grade 91 Class 2

AZ61A magnesium belongs to the magnesium alloys classification, while ASTM A387 grade 91 class 2 belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 AZ61A magnesium and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 11
20
Fatigue Strength, MPa 130
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 17
75
Shear Strength, MPa 150
420
Tensile Strength: Ultimate (UTS), MPa 280
670
Tensile Strength: Yield (Proof), MPa 170
470

Thermal Properties

Latent Heat of Fusion, J/g 350
270
Maximum Temperature: Mechanical, °C 120
600
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 530
1420
Specific Heat Capacity, J/kg-K 990
470
Thermal Conductivity, W/m-K 79
26
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 62
10

Otherwise Unclassified Properties

Base Metal Price, % relative 12
7.0
Density, g/cm3 1.7
7.8
Embodied Carbon, kg CO2/kg material 23
2.6
Embodied Energy, MJ/kg 160
37
Embodied Water, L/kg 980
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
120
Resilience: Unit (Modulus of Resilience), kJ/m3 310
580
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 46
24
Strength to Weight: Bending, points 56
22
Thermal Diffusivity, mm2/s 47
6.9
Thermal Shock Resistance, points 17
19

Alloy Composition


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Aluminum (Al), % 5.5 to 7.2
0 to 0.020
Carbon (C), % 0
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.0050
87.3 to 90.3
Magnesium (Mg), % 90.3 to 93.9
0
Manganese (Mn), % 0.15 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0 to 0.0050
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.1
0.2 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 0.4 to 1.5
0
Zirconium (Zr), % 0
0 to 0.010
Residuals, % 0 to 0.3
0