Characterization of dynamic microstructure evolution during hot deformation of Al-4.10Cu-1.42Mg-0.57Mn-0.12Zr alloy

作     者：刘灿 张辉 蒋福林 Can LIU;Hui ZHANG;Fu-lin JIANG

作者机构：湖南大学材料科学与工程学院长沙410082 湖南大学湖南省喷射沉积技术及应用重点实验室长沙410082 Department of Materials Science and Engineering Mc Master University Hamiltion Ontario L8S 4L7 Canada 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2014年第24卷第11期

页      面：3477-3485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）] 

基　　金：Project(2009CB623704)supported by the National Basic Research(973)Program of China Project(20130161110007)supported by the Doctoral Program of the Ministry of Education,China Project(CX2013B128)supported by Hunan Provincial Innovation Foundation for Postgraduate,China 

主　　题：aluminum alloy hot deformation flow softening dynamic recovery dynamic precipitation 

摘      要：The Al?4.10Cu?1.42Mg?0.57Mn?0.12Zr alloy was compressed to different strains at deformation temperature of 300 oC and strain rate of 10 s?1 on Gleeble?1500 system. The dynamic complex microstructures evolutions were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The true stress?true strain curves exhibited a peak stress at critical strain, after which the flow stresses decreased monotonically, showing a dynamic flow softening. As the strain increased, the dislocation tangled to cell structure and sub-grain structure, which indicated the occurrence of dynamic recovery during deformation. Dynamic precipitations ofS (Al2CuMg),θ (Al2Cu) and Al3Zr phase were accelerated and coarsened by deformation. ContinuousS phases precipitated in the Al matrix and discontinuousS phases were found to be nucleated near the Al3Zr phase and at the sub-grain boundary. The flow softening mechanism was resulted from the reduction of dislocation density which attributed to dynamic recovery and precipitates coarsening.