Abstract
A series of Al-Li-Cu alloys with copper content of 0 to 6 wt pct and lithium content of 2.5 wt pct were studied. The results showed that copper plays an important role in grain refining, homogenization, and aging, and significantly influences the mechanical properties and fracture behaviors of the alloys. With the addition of copper, the hardness and peak-aging time increase, and the tensile strength gradually increases to a maximum value with copper content of about 3 wt pct and decreases after that. However, elongation decreases constantly, and the crack roots increase and lead to early crack. The mechanism of mechanical properties and fracture behaviors of Al-Li-Cu alloy is also discussed.
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