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AZ91C Magnesium vs. 204.0 Aluminum

AZ91C magnesium belongs to the magnesium alloys classification, while 204.0 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is AZ91C magnesium and the bottom bar is 204.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
71
Elongation at Break, % 2.3 to 7.9
5.7 to 7.8
Fatigue Strength, MPa 56 to 85
63 to 77
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 18
27
Tensile Strength: Ultimate (UTS), MPa 170 to 270
230 to 340
Tensile Strength: Yield (Proof), MPa 83 to 130
180 to 220

Thermal Properties

Latent Heat of Fusion, J/g 350
390
Maximum Temperature: Mechanical, °C 130
170
Melting Completion (Liquidus), °C 600
650
Melting Onset (Solidus), °C 470
580
Solidification (Pattern Maker's) Shrinkage, % 1.3
1.3
Specific Heat Capacity, J/kg-K 990
880
Thermal Conductivity, W/m-K 73
120
Thermal Expansion, µm/m-K 26
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.9 to 12
29 to 34
Electrical Conductivity: Equal Weight (Specific), % IACS 52 to 60
87 to 100

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 1.7
3.0
Embodied Carbon, kg CO2/kg material 22
8.0
Embodied Energy, MJ/kg 160
150
Embodied Water, L/kg 990
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.2 to 16
12 to 23
Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 180
220 to 350
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
46
Strength to Weight: Axial, points 27 to 43
21 to 31
Strength to Weight: Bending, points 39 to 53
28 to 36
Thermal Diffusivity, mm2/s 43
46
Thermal Shock Resistance, points 9.9 to 16
12 to 18

Alloy Composition


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Aluminum (Al), % 8.1 to 9.3
93.4 to 95.5
Copper (Cu), % 0 to 0.1
4.2 to 5.0
Iron (Fe), % 0
0 to 0.35
Magnesium (Mg), % 88.6 to 91.4
0.15 to 0.35
Manganese (Mn), % 0.13 to 0.35
0 to 0.1
Nickel (Ni), % 0 to 0.010
0 to 0.050
Silicon (Si), % 0 to 0.3
0 to 0.2
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0
0.15 to 0.3
Zinc (Zn), % 0.4 to 1.0
0 to 0.1
Residuals, % 0 to 0.3
0 to 0.15

Comparable Variants