Effects of indium on precipitation in Al-3.3Cu-0.8Li alloy

作     者：Zhengrong PAN Ziqiao ZHENG Zhongquan LIAO Shichen LI 

作者机构：School of Materials Science and Engineering Central South University Changsha 410083 China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2010年第23卷第4期

页      面：285-292页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(No.50801067) 

主　　题：Indium Precipitation Microstructure HRTEM 3DAP 

摘      要：The effects of 0.5 wt pct In on Al-3.3Cu-0.8Li alloy were studied. Instead of T1 （Al2CuLi） phase, there was an unknown cubic phase acting as the dominant precipitates in the In-added alloy in T6 temper, which disappeared in T8 temper. The orientation relationship between this phase and matrix was given by SAEDs： （001）p//（001）α, [010]p//[010]α. Both measuring directly from HREM images or calculating from it＇s FFTs gave an close lattice parameter about 0.83 nm. 3DAP composition analysis revealed the presence of Al, Cu and Li in the atomic percentages： 60%Al, 30%Cu and 10%Li. Thus, this cubic phase is considered to be Li-rich γ1 （Al4Cu9） phase or a new phase designated as X （Al5Cu6Li2）. Different from the traditional report providing heterogeneous nucleation sites for the precipitates, In was detected neither around nor in the cubic phase by EDX and 3DAP.