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7129 Aluminum vs. 4145 Aluminum

Both 7129 Aluminum and 4145 aluminum are aluminum alloys. They have 86% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is 7129 Aluminum and the bottom bar is 4145 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
73
Elongation at Break, % 9.0 to 9.1
2.2
Fatigue Strength, MPa 150 to 190
48
Poisson's Ratio 0.33
0.33
Shear Modulus, GPa 26
28
Shear Strength, MPa 250 to 260
69
Tensile Strength: Ultimate (UTS), MPa 430
120
Tensile Strength: Yield (Proof), MPa 380 to 390
68

Thermal Properties

Latent Heat of Fusion, J/g 380
540
Maximum Temperature: Mechanical, °C 180
160
Melting Completion (Liquidus), °C 630
590
Melting Onset (Solidus), °C 510
520
Specific Heat Capacity, J/kg-K 880
880
Thermal Conductivity, W/m-K 150
100
Thermal Expansion, µm/m-K 24
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
26
Electrical Conductivity: Equal Weight (Specific), % IACS 120
84

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Density, g/cm3 2.9
2.8
Embodied Carbon, kg CO2/kg material 8.3
7.6
Embodied Energy, MJ/kg 150
140
Embodied Water, L/kg 1150
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
2.3
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
31
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
50
Strength to Weight: Axial, points 41
12
Strength to Weight: Bending, points 43 to 44
19
Thermal Diffusivity, mm2/s 58
42
Thermal Shock Resistance, points 19
5.5

Alloy Composition

Aluminum (Al), % 91 to 94
83 to 87.4
Chromium (Cr), % 0 to 0.1
0 to 0.15
Copper (Cu), % 0.5 to 0.9
3.3 to 4.7
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
0 to 0.8
Magnesium (Mg), % 1.3 to 2.0
0 to 0.15
Manganese (Mn), % 0 to 0.1
0 to 0.15
Silicon (Si), % 0 to 0.15
9.3 to 10.7
Titanium (Ti), % 0 to 0.050
0
Vanadium (V), % 0 to 0.050
0
Zinc (Zn), % 4.2 to 5.2
0 to 0.2
Residuals, % 0
0 to 0.15