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AZ81A Magnesium vs. C49300 Brass

AZ81A magnesium belongs to the magnesium alloys classification, while C49300 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 AZ81A magnesium and the bottom bar is C49300 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
100
Elongation at Break, % 3.0 to 8.8
4.5 to 20
Poisson's Ratio 0.29
0.31
Shear Modulus, GPa 18
40
Shear Strength, MPa 91 to 130
270 to 290
Tensile Strength: Ultimate (UTS), MPa 160 to 240
430 to 520
Tensile Strength: Yield (Proof), MPa 84
210 to 410

Thermal Properties

Latent Heat of Fusion, J/g 350
170
Maximum Temperature: Mechanical, °C 130
120
Melting Completion (Liquidus), °C 600
880
Melting Onset (Solidus), °C 500
840
Specific Heat Capacity, J/kg-K 990
380
Thermal Conductivity, W/m-K 84
88
Thermal Expansion, µm/m-K 27
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
15
Electrical Conductivity: Equal Weight (Specific), % IACS 65
17

Otherwise Unclassified Properties

Base Metal Price, % relative 12
26
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 23
3.0
Embodied Energy, MJ/kg 160
50
Embodied Water, L/kg 990
370

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.0 to 17
21 to 71
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 78
220 to 800
Stiffness to Weight: Axial, points 15
7.2
Stiffness to Weight: Bending, points 70
19
Strength to Weight: Axial, points 26 to 39
15 to 18
Strength to Weight: Bending, points 38 to 50
16 to 18
Thermal Diffusivity, mm2/s 50
29
Thermal Shock Resistance, points 9.1 to 14
14 to 18

Alloy Composition


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Aluminum (Al), % 7.0 to 8.1
0 to 0.5
Antimony (Sb), % 0
0 to 0.5
Bismuth (Bi), % 0
0.5 to 2.0
Copper (Cu), % 0 to 0.1
58 to 62
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0
0 to 0.010
Magnesium (Mg), % 89.8 to 92.5
0
Manganese (Mn), % 0.13 to 0.35
0 to 0.030
Nickel (Ni), % 0 to 0.010
0 to 1.5
Phosphorus (P), % 0
0 to 0.2
Selenium (Se), % 0
0 to 0.2
Silicon (Si), % 0 to 0.3
0 to 0.1
Tin (Sn), % 0
1.0 to 1.8
Zinc (Zn), % 0.4 to 1.0
30.6 to 40.5
Residuals, % 0 to 0.3
0 to 0.5