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7076 Aluminum vs. AISI 444 Stainless Steel

7076 aluminum belongs to the aluminum alloys classification, while AISI 444 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (3, 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 7076 aluminum and the bottom bar is AISI 444 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
190
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 6.2
23
Fatigue Strength, MPa 170
210
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
78
Shear Strength, MPa 310
300
Tensile Strength: Ultimate (UTS), MPa 530
470
Tensile Strength: Yield (Proof), MPa 460
310

Thermal Properties

Latent Heat of Fusion, J/g 380
290
Maximum Temperature: Mechanical, °C 170
930
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 460
1420
Specific Heat Capacity, J/kg-K 860
480
Thermal Conductivity, W/m-K 140
23
Thermal Expansion, µm/m-K 24
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 100
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 3.0
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.4
Embodied Energy, MJ/kg 150
47
Embodied Water, L/kg 1110
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
95
Resilience: Unit (Modulus of Resilience), kJ/m3 1510
240
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 49
17
Strength to Weight: Bending, points 48
17
Thermal Diffusivity, mm2/s 54
6.2
Thermal Shock Resistance, points 23
16

Alloy Composition

Aluminum (Al), % 86.9 to 91.2
0
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0
17.5 to 19.5
Copper (Cu), % 0.3 to 1.0
0
Iron (Fe), % 0 to 0.6
73.3 to 80.8
Magnesium (Mg), % 1.2 to 2.0
0
Manganese (Mn), % 0.3 to 0.8
0 to 1.0
Molybdenum (Mo), % 0
1.8 to 2.5
Nickel (Ni), % 0
0 to 1.0
Niobium (Nb), % 0
0.2 to 0.8
Nitrogen (N), % 0
0 to 0.035
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0.2 to 0.8
Zinc (Zn), % 7.0 to 8.0
0
Residuals, % 0 to 0.15
0