Effect of copper content on mechanical properties and fracture behaviors of Al-Li-Cu alloy |
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| Authors: | Qiang Liu Chang-Zheng Chen Jian-Zhong Cui |
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| Affiliation: | (1) School of Mechanical Engineering, Shenyang Institute of Chemical Technology, 110142 Shenyang, People’s Republic of China;(2) the School of Mechanical Engineering, Shenyang University of Technology, 110023 Shenyang, People’s Republic of China;(3) the Key Lab of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, 11004 Shenyang, People’s Republic of China |
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| 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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