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AZ91A Magnesium vs. 7204 Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while 7204 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 7204 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
70
Elongation at Break, % 5.0
11 to 13
Fatigue Strength, MPa 99
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
26
Shear Strength, MPa 140
130 to 220
Tensile Strength: Ultimate (UTS), MPa 240
220 to 380
Tensile Strength: Yield (Proof), MPa 160
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 360
380
Maximum Temperature: Mechanical, °C 130
210
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 470
520
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 73
150
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
39
Electrical Conductivity: Equal Weight (Specific), % IACS 52
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 1.7
2.9
Embodied Carbon, kg CO2/kg material 22
8.4
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
25 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 280
110 to 710
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
47
Strength to Weight: Axial, points 38
21 to 36
Strength to Weight: Bending, points 49
28 to 40
Thermal Diffusivity, mm2/s 42
58
Thermal Shock Resistance, points 14
9.4 to 16

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
90.5 to 94.8
Chromium (Cr), % 0
0 to 0.3
Copper (Cu), % 0 to 0.1
0 to 0.2
Iron (Fe), % 0
0 to 0.35
Magnesium (Mg), % 88.2 to 91.2
1.0 to 2.0
Manganese (Mn), % 0.13 to 0.5
0.2 to 0.7
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.3
Titanium (Ti), % 0
0 to 0.2
Vanadium (V), % 0
0 to 0.1
Zinc (Zn), % 0.35 to 1.0
4.0 to 5.0
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15