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AZ81A Magnesium vs. C99750 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C99750 brass belongs to the copper alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, 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 AZ81A magnesium and the bottom bar is C99750 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 55
110 to 120
Elastic (Young's, Tensile) Modulus, GPa 46
130
Elongation at Break, % 3.0 to 8.8
20 to 30
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
48
Tensile Strength: Ultimate (UTS), MPa 160 to 240
450 to 520
Tensile Strength: Yield (Proof), MPa 84
220 to 280

Thermal Properties

Latent Heat of Fusion, J/g 350
200
Maximum Temperature: Mechanical, °C 130
160
Melting Completion (Liquidus), °C 600
840
Melting Onset (Solidus), °C 500
820
Specific Heat Capacity, J/kg-K 990
410
Thermal Expansion, µm/m-K 27
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 65
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 12
23
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 23
3.1
Embodied Energy, MJ/kg 160
51
Embodied Water, L/kg 990
310

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
87 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
190 to 300
Stiffness to Weight: Axial, points 15
8.6
Stiffness to Weight: Bending, points 70
21
Strength to Weight: Axial, points 26 to 39
15 to 18
Strength to Weight: Bending, points 38 to 50
16 to 18
Thermal Shock Resistance, points 9.1 to 14
13 to 15

Alloy Composition

Aluminum (Al), % 7.0 to 8.1
0.25 to 3.0
Copper (Cu), % 0 to 0.1
55 to 61
Iron (Fe), % 0
0 to 1.0
Lead (Pb), % 0
0.5 to 2.5
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
17 to 23
Nickel (Ni), % 0 to 0.010
0 to 5.0
Silicon (Si), % 0 to 0.3
0
Zinc (Zn), % 0.4 to 1.0
17 to 23
Residuals, % 0 to 0.3
0 to 0.3

Comparable Variants