Behavior of Growth and Coarsening of T_1(Al_2CuLi) Precipitates in Al-Li Alloys 2090 and 2090+Ce

作     者：Zhilong Zhao, Lin Liu, Zheng Chen Dopartment of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China 

作者机构：西北工业大学 陕西 西安 710072 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2001年第20卷第3期

页      面：174-177页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

主　　题：Al-Li alloy T-1(Al2CuLi) precipitates growth and coarsening trace addition of cerium 

摘      要：The behavior of growth and coarsening of T-1(Al2CuLi) precipitates was comparatively studied by means of TEM technique in two Al-Li alloys 2090 and 2090+Ce (with cerium content less than 0.1% in mass fraction). Statistical analysis results show that T-1 precipitates in alloy 2090+Ce have smaller aspect ratio, which is connected with the more intersections between different T-1 variants in this alloy. It is also found that the variation of maximum length of T-1 precipitates with aging time can be obviously divided into two stages of growth and coarsening. The diffusion coefficients of solute atoms of Cu and Li are calculated via growth kinetics curves of T-1 precipitates. The results show that the diffusion of atom Cu plays a more important role in the formation of T-1 precipitates.