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AZ91A Magnesium vs. Grade 7 Babbitt Metal

AZ91A magnesium belongs to the magnesium alloys classification, while grade 7 Babbitt Metal belongs to the otherwise unclassified metals. 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 AZ91A magnesium and the bottom bar is grade 7 Babbitt Metal.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
23
Compressive (Crushing) Strength, MPa 160
110
Elastic (Young's, Tensile) Modulus, GPa 46
26
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 18
9.1
Tensile Strength: Yield (Proof), MPa 160
25

Thermal Properties

Latent Heat of Fusion, J/g 360
48
Melting Completion (Liquidus), °C 600
270
Melting Onset (Solidus), °C 470
240
Specific Heat Capacity, J/kg-K 990
150
Thermal Expansion, µm/m-K 26
26

Otherwise Unclassified Properties

Base Metal Price, % relative 12
23
Density, g/cm3 1.7
10
Embodied Carbon, kg CO2/kg material 22
4.4
Embodied Energy, MJ/kg 160
62
Embodied Water, L/kg 990
880

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 280
12
Stiffness to Weight: Axial, points 15
1.4
Stiffness to Weight: Bending, points 69
9.6

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.0050
Antimony (Sb), % 0
14 to 16
Arsenic (As), % 0
0.3 to 0.6
Bismuth (Bi), % 0
0 to 0.1
Cadmium (Cd), % 0
0 to 0.050
Copper (Cu), % 0 to 0.1
0 to 0.5
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0
71.9 to 76.4
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0
Tin (Sn), % 0
9.3 to 10.7
Zinc (Zn), % 0.35 to 1.0
0 to 0.0050