6061 is a heat-treatable strengthenable alloy with good formability and machinability. It also has medium strength and can still maintain good operability after annealing.

  The main alloying elements of 6061 alloy are magnesium and silicon, and form the Mg2Si phase. If it contains a certain amount of manganese and chromium,

 it can neutralize the bad effects of iron; sometimes a small amount of copper or zinc is added to improve the strength of the alloy without 

significantly reducing its corrosion resistance; there are also a small amount of conductive materials. of copper to offset the effects of titanium and

 iron on conductivity; zirconium or titanium can refine grains and control the recrystallized structure; lead and bismuth can be added for machinability. 

Mg2Si is solid dissolved in aluminum, giving the alloy artificial age hardening properties.