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7129 Aluminum vs. SAE-AISI 52100 Steel

7129 Aluminum belongs to the aluminum alloys classification, while SAE-AISI 52100 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 7129 Aluminum and the bottom bar is SAE-AISI 52100 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.0 to 9.1
10 to 20
Fatigue Strength, MPa 150 to 190
250 to 340
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
72
Shear Strength, MPa 250 to 260
370 to 420
Tensile Strength: Ultimate (UTS), MPa 430
590 to 2010
Tensile Strength: Yield (Proof), MPa 380 to 390
360 to 560

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 180
430
Melting Completion (Liquidus), °C 630
1450
Melting Onset (Solidus), °C 510
1410
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
47
Thermal Expansion, µm/m-K 24
12 to 13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.4
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1150
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
54 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
350 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 41
21 to 72
Strength to Weight: Bending, points 43 to 44
20 to 45
Thermal Diffusivity, mm2/s 58
13
Thermal Shock Resistance, points 19
19 to 61

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0.93 to 1.1
Chromium (Cr), % 0 to 0.1
1.4 to 1.6
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
96.5 to 97.3
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0.25 to 0.45
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.15
0.15 to 0.35
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0
Residuals, % 0 to 0.15
0