Study on the microstructures of aluminum-lithium alloy by high resolution transmission electron microscopy
YUAN Zhi-shan1, ZHANG Xian-feng2, FENG Zhao-hui2, LU Zheng2, DAI Sheng-long2, LIU Chang-sheng3
1.General Research Institute for Non-Ferrous Metals, Grikin Advanced Materials, Co., Ltd.; 2.Beijing Institute of Aeronautical Materials; 3.School of Materials & Metallurgy, Northeastern University
Abstract：The new high strength aluminum-lithium alloy (Al-Cu-Li) was taken as sample. After solid quenching at 520 ℃, the alloy was aged at 165 ℃ for 6 h and 18 h, respectively. Then, the morphology and lattice image of δ phase and T1 phase in microstructure of aluminum-lithium alloy were observed using high resolution electron microscope. The nucleation mechanism of main strengthening phase (T1 phase) was studied. The results indicated that the unit cell T1 phase had five-layer close-packed hexagonal stacking structure, and the chemical stacking sequence of T1 phase was CBABC. It was found that T1 phase not only could grow on matrix for nucleation, but also could grow on original T1 phase in the stepped form for nucleation. The tiny spherical precipitated phase (δ phase) was ordered structure phase, and was coherent with matrix.
袁志山;张显峰;冯朝辉;陆政;戴圣龙;刘常升. 铝锂合金显微组织高分辨电子显微研究[J]. 冶金分析, 2011, 31(4): 35-38.
YUAN Zhi-shan;ZHANG Xian-feng;FENG Zhao-hui;LU Zheng;DAI Sheng-long;LIU Chang-sheng. Study on the microstructures of aluminum-lithium alloy by high resolution transmission electron microscopy. , 2011, 31(4): 35-38.
