A6061 Physical properties Density (ρ)2.70 g/cm3 Mechanical properties Young’s modulus (E)68.9 GPa (9,990 ksi) Tensile strength (σt)124–290 MPa (18.0–42.1 ksi) Elongation (ε) at break12–25% Poisson’s ratio (ν)0.33 Thermal properties Melting temperature (Tm)585 °C (1,085 °F) Thermal conductivity (k)151–202 W/(m·K) Linear thermal expansion coefficient (α)2.32×10−5 K−1 Specific heat capacity (c)897 J/(kg·K) Electrical properties Volume resistivity (ρ)32.5–39.2 nOhm·m 6061 is a precipitation-hardened aluminum alloy, containing magnesium and silicon as its major alloying elements. Originally called “Alloy 61S”, it was developed in 1935. It has good mechanical properties, exhibits good weldability, and is very commonly extruded (second in popularity only to 6063). It is one of the most common alloys of aluminum for general-purpose use.
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Processing: Excellent Machinability, Weldability, and High Strength. Welding: 6061 can be readily welded using all the common welding techniques.
Forging: 6061 can be forged at temperatures in the range of 750°F to 900°F. Hot working may be done in the temperature range of 500°F to 700°F.
Heat Treating: Solution heat treat at 990°F for adequate time to allow for thorough heating and then water quenched. Precipitation hardening is done at 320°F for 18 hours and air cool, followed by 350°F for 8 hours and air cooled.
Annealing: Should be done at 775°F for at 2 to 3 hours at temperature, followed by controlled cooling at 50°F per hour down to 500°F, then air cooled.
Aging: The aging precipitation heat treatment is done at 350°F for 8 hours, followed by air cooling. This produces the T6 temper.