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6061-T6 Aluminum vs. 7075-T6 Aluminum

Both 6061-T6 aluminum and 7075-T6 aluminum are aluminum alloys. Both are furnished in the T6 temper. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is 6061-T6 aluminum and the bottom bar is 7075-T6 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 93
150
Elastic (Young's, Tensile) Modulus, GPa 69
70
Elongation at Break, % 10
7.9
Fatigue Strength, MPa 96
160
Poisson's Ratio 0.33
0.32
Shear Modulus, GPa 26
26
Shear Strength, MPa 210
330
Tensile Strength: Ultimate (UTS), MPa 310
560
Tensile Strength: Yield (Proof), MPa 270
480

Thermal Properties

Latent Heat of Fusion, J/g 400
380
Maximum Temperature: Mechanical, °C 170
200
Melting Completion (Liquidus), °C 650
640
Melting Onset (Solidus), °C 580
480
Specific Heat Capacity, J/kg-K 900
870
Thermal Conductivity, W/m-K 170
130
Thermal Expansion, µm/m-K 24
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 43
33
Electrical Conductivity: Equal Weight (Specific), % IACS 140
98

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
10
Calomel Potential, mV -740
-750
Density, g/cm3 2.7
3.0
Embodied Carbon, kg CO2/kg material 8.3
8.3
Embodied Energy, MJ/kg 150
150
Embodied Water, L/kg 1180
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 30
42
Resilience: Unit (Modulus of Resilience), kJ/m3 520
1630
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
46
Strength to Weight: Axial, points 31
51
Strength to Weight: Bending, points 37
50
Thermal Diffusivity, m2/s 68
50
Thermal Shock Resistance, points 14
24

Alloy Composition

Aluminum (Al), % 95.9 to 98.6
86.9 to 91.4
Chromium (Cr), % 0.040 to 0.35
0.18 to 0.28
Copper (Cu), % 0.15 to 0.4
1.2 to 2.0
Iron (Fe), % 0 to 0.7
0 to 0.5
Magnesium (Mg), % 0.8 to 1.2
2.1 to 2.9
Manganese (Mn), % 0 to 0.15
0 to 0.3
Silicon (Si), % 0.4 to 0.8
0 to 0.4
Titanium (Ti), % 0 to 0.15
0 to 0.2
Zinc (Zn), % 0 to 0.25
5.1 to 6.1
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0 to 0.15
0 to 0.15