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AZ91A Magnesium vs. 7049A Aluminum

AZ91A magnesium belongs to the magnesium alloys classification, while 7049A 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 7049A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
71
Elongation at Break, % 5.0
5.0 to 5.7
Fatigue Strength, MPa 99
180
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 18
27
Shear Strength, MPa 140
340 to 350
Tensile Strength: Ultimate (UTS), MPa 240
580 to 590
Tensile Strength: Yield (Proof), MPa 160
500 to 530

Thermal Properties

Latent Heat of Fusion, J/g 360
370
Maximum Temperature: Mechanical, °C 130
200
Melting Completion (Liquidus), °C 600
640
Melting Onset (Solidus), °C 470
430
Specific Heat Capacity, J/kg-K 990
850
Thermal Conductivity, W/m-K 73
130
Thermal Expansion, µm/m-K 26
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 10
40
Electrical Conductivity: Equal Weight (Specific), % IACS 52
120

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
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 11
28 to 32
Resilience: Unit (Modulus of Resilience), kJ/m3 280
1800 to 1990
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
44
Strength to Weight: Axial, points 38
52 to 53
Strength to Weight: Bending, points 49
50 to 51
Thermal Diffusivity, mm2/s 42
50
Thermal Shock Resistance, points 14
25

Alloy Composition


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Aluminum (Al), % 8.3 to 9.7
84.6 to 89.5
Chromium (Cr), % 0
0.050 to 0.25
Copper (Cu), % 0 to 0.1
1.2 to 1.9
Iron (Fe), % 0
0 to 0.5
Magnesium (Mg), % 88.2 to 91.2
2.1 to 3.1
Manganese (Mn), % 0.13 to 0.5
0 to 0.5
Nickel (Ni), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.4
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0.35 to 1.0
7.2 to 8.4
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15