Interactions between cadmium and multiple precipitates in an Al-Li-Cu alloy:Improving aging kinetics and precipitation hardening

作     者：Liang Wu Yugang Li Xianfeng Li Naiheng Ma Haowei Wang Liang Wu;Yugang Li;Xianfeng Li;Naiheng Ma;Haowei Wang

作者机构：State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghai200240China School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第42卷第11期

页      面：44-49页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Functional Materials for Informatics of Shanghai Institute of Microsystem and Information Technology 

主　　题：Aluminum alloys Three-dimensional atom probe(3DAP) High-angle annular dark-field(HAADF) Precipitation Cadmium 

摘      要：This work demonstrates significant improvements in both the aging kinetics and precipitation hardening of an Al-Li-Cu alloy with the minor addition of Cd(0.06 at.%).The precipitation hardening effect of T1 precipitates in casting Al-Li-Cu alloys has long been ignored since it is difficult to achieve a high number density of fine precipitates without a large number of dislocations.A detailed transmission electron microscopy investigation shows that the Cd addition has changed the distribution of T1 precipitates from the conventional uneven distribution near dislocations or grain boundaries to a more homogeneous *** of the Cd-rich nanoparticles were observed at the broad face and/or terminal of the T1 *** is highly likely that these nanoparticles act as heterogeneous nucleation sites,which consequently leads to a higher number density of T1 ***,Cd atoms were preferentially segregated withinδprecipitates,which can be attributed to the strong bonding between Li and *** interactions between Cd and the T1(Al2CuLi)andδ′(Al3Li)precipitates in Al-Li-Cu alloy are first *** present study may propose a new mechanism to effectively improve precipitation kinetics and therefore the age-hardening effect of Al-Li-Cu alloys.