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7129 Aluminum vs. AISI 309 Stainless Steel

7129 Aluminum belongs to the aluminum alloys classification, while AISI 309 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 AISI 309 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 9.0 to 9.1
34 to 47
Fatigue Strength, MPa 150 to 190
250 to 280
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
78
Shear Strength, MPa 250 to 260
420 to 470
Tensile Strength: Ultimate (UTS), MPa 430
600 to 710
Tensile Strength: Yield (Proof), MPa 380 to 390
260 to 350

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 180
980
Melting Completion (Liquidus), °C 630
1450
Melting Onset (Solidus), °C 510
1400
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 24
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
19
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
3.6
Embodied Energy, MJ/kg 150
51
Embodied Water, L/kg 1150
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
200 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
170 to 310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 41
21 to 25
Strength to Weight: Bending, points 43 to 44
20 to 23
Thermal Diffusivity, mm2/s 58
4.3
Thermal Shock Resistance, points 19
14 to 16

Alloy Composition

Aluminum (Al), % 91 to 94
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0 to 0.1
22 to 24
Copper (Cu), % 0.5 to 0.9
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.3
58 to 66
Magnesium (Mg), % 1.3 to 2.0
0
Manganese (Mn), % 0 to 0.1
0 to 2.0
Nickel (Ni), % 0
12 to 15
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.15
0 to 0.75
Sulfur (S), % 0
0 to 0.030
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