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AZ91B Magnesium vs. CC751S Brass

AZ91B magnesium belongs to the magnesium alloys classification, while CC751S brass belongs to the copper alloys. There are 29 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 AZ91B magnesium and the bottom bar is CC751S brass.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 63
130
Elastic (Young's, Tensile) Modulus, GPa 46
110
Elongation at Break, % 5.0
5.6
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
40
Tensile Strength: Ultimate (UTS), MPa 240
450
Tensile Strength: Yield (Proof), MPa 160
320

Thermal Properties

Latent Heat of Fusion, J/g 360
190
Maximum Temperature: Mechanical, °C 130
130
Melting Completion (Liquidus), °C 600
850
Melting Onset (Solidus), °C 470
810
Specific Heat Capacity, J/kg-K 990
390
Thermal Conductivity, W/m-K 73
110
Thermal Expansion, µm/m-K 26
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
25
Electrical Conductivity: Equal Weight (Specific), % IACS 58
28

Otherwise Unclassified Properties

Base Metal Price, % relative 12
24
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 22
2.8
Embodied Energy, MJ/kg 160
46
Embodied Water, L/kg 990
330

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
23
Resilience: Unit (Modulus of Resilience), kJ/m3 280
480
Stiffness to Weight: Axial, points 15
7.2
Stiffness to Weight: Bending, points 69
19
Strength to Weight: Axial, points 38
15
Strength to Weight: Bending, points 49
16
Thermal Diffusivity, mm2/s 42
35
Thermal Shock Resistance, points 14
15

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0 to 0.1
Antimony (Sb), % 0
0 to 0.5
Copper (Cu), % 0 to 0.35
62.7 to 66
Iron (Fe), % 0
0.25 to 0.5
Lead (Pb), % 0
0.8 to 2.2
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0 to 0.15
Nickel (Ni), % 0 to 0.030
0 to 0.8
Silicon (Si), % 0 to 0.5
0.65 to 1.1
Tin (Sn), % 0
0 to 0.8
Zinc (Zn), % 0.35 to 1.0
27.9 to 35.6