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AZ91A Magnesium vs. 7178 Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while 7178 aluminum belongs to the aluminum 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.

For each property being compared, the top bar is AZ91A magnesium and the bottom bar is 7178 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
71
Elongation at Break, % 5.0
4.5 to 12
Fatigue Strength, MPa 99
120 to 210
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
140 to 380
Tensile Strength: Ultimate (UTS), MPa 240
240 to 640
Tensile Strength: Yield (Proof), MPa 160
120 to 560

Thermal Properties

Latent Heat of Fusion, J/g 360
370
Maximum Temperature: Mechanical, °C 130
180
Melting Completion (Liquidus), °C 600
630
Melting Onset (Solidus), °C 470
480
Specific Heat Capacity, J/kg-K 990
860
Thermal Conductivity, W/m-K 73
130
Thermal Expansion, µm/m-K 26
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
31
Electrical Conductivity: Equal Weight (Specific), % IACS 52
91

Otherwise Unclassified Properties

Base Metal Price, % relative 12
10
Density, g/cm3 1.7
3.1
Embodied Carbon, kg CO2/kg material 22
8.2
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
24 to 52
Resilience: Unit (Modulus of Resilience), kJ/m3 280
110 to 2220
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
45
Strength to Weight: Axial, points 38
21 to 58
Strength to Weight: Bending, points 49
28 to 54
Thermal Diffusivity, mm2/s 42
47
Thermal Shock Resistance, points 14
10 to 28

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
85.4 to 89.5
Chromium (Cr), % 0
0.18 to 0.28
Copper (Cu), % 0 to 0.1
1.6 to 2.4
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 88.2 to 91.2
2.4 to 3.1
Manganese (Mn), % 0.13 to 0.5
0 to 0.3
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.4
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0.35 to 1.0
6.3 to 7.3
Residuals, % 0
0 to 0.15