Aging behaviors of Al-Cu-Li-Zr alloy containing Sc
来源期刊：中国有色金属学报(英文版)2005年第z3期
论文作者：梁文杰 潘青林 朱朝明 何运斌 刘元斐
文章页码：12 - 17
Key words：Al-Li alloy； artificial single-aging treatment； microstructures aging behavior
Abstract: Single aging effects on the microstructures and the room-temperature mechanical properties of Al-3.5Cu-1.5Li-0.22（Sc+Zr） alloy were observed using TEM, tensile test and hardness test at room temperature. The results show that the alloy has the character of aging hardening. The aging temperature and aging time have significant effects on the amount and distribution of the major phase of precipitation and strengthening of the alloy. At both high and low temperatures, the precipitation caused by aging is few and coarse, but at high temperature, the coarse equilibrium phases are visible at grain boundaries, therefore, influencing the composite properties of the alloy. The proper artificial single-aging treatment of the alloy is 160℃, 40h. Under this condition, the alloy obtains homogeneously distributed fine T1 phases, which leads to an optimal mechanical properties, i.e. σb is 483MPa, σ 0.2 is 413MPa, and δ is 8.4% for the alloy. However, extending overaging to 50h at 160℃, the coarse equilibrium phases precipitate at grain boundaries leads to wide precipitates-free zone（PFZ） along the grain boundaries, further results in a decrease in the composite properties of the alloy.
基金信息：the National High-Tech Research and Development Program of China
