Comparative TEM investigation on the precipitation behaviors in Cu-15wt% Sn alloy  

作　　者：Zeng-Jie Wang Konno J. Toyohiko Chao-Li Ma 

机构地区：[1]School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics [2]Institute for Materials Research,Tohoku University

出　　处：《Rare Metals》2013年第2期139-143,共5页稀有金属（英文版）

基　　金：supported by the China Scholarship Council(No.2010602038);the Ministry of Science and Technology of China(No.2010DFA51650)

摘　　要：The decomposition and precipitation behaviors of a quenched Cu-15wt%Sn alloy as a function of aging temperature were investigated using transmission electron microscopy （TEM）. Focused ion beam （FIB） was employed to assist TEM specimen preparation. At 300 ℃, the decomposition of the supersaturated phase occurred at grain boundaries, displaying a cellular morphology. The lamellae were found with and phases, rather than with the equilibrium e and phases. The and phases exhibit a welldefined orientation relationship （OR） as On the other hand, at 320 ℃, only incipient lamellar structures of several micron meters were observed, which were composed of the 6 and phases. At the same time, abundant intragranular precipitation of the e phase in the form of platelets was observed, and OR as （lil）J/ （001）, [110] J/[100] exists between e phase and the ct phase. These contrasting precipitation behaviors are discussed from the viewpoint of crystallographic coherency of these phases.The decomposition and precipitation behaviors of a quenched Cu-15wt%Sn alloy as a function of aging temperature were investigated using transmission electron microscopy （TEM）. Focused ion beam （FIB） was employed to assist TEM specimen preparation. At 300 ℃, the decomposition of the supersaturated phase occurred at grain boundaries, displaying a cellular morphology. The lamellae were found with and phases, rather than with the equilibrium e and phases. The and phases exhibit a welldefined orientation relationship （OR） as On the other hand, at 320 ℃, only incipient lamellar structures of several micron meters were observed, which were composed of the 6 and phases. At the same time, abundant intragranular precipitation of the e phase in the form of platelets was observed, and OR as （lil）J/ （001）, [110] J/[100] exists between e phase and the ct phase. These contrasting precipitation behaviors are discussed from the viewpoint of crystallographic coherency of these phases.

关 键 词：Cu-Sn alloy Precipitation behaviorsFocused ion beam （FIB） TEM CRYSTALLOGRAPHY 

分 类 号：TG115.213[金属学及工艺—物理冶金]