Combined Effects of Pre-deformation and Preaging on the Mechanical Properties of Al-Cu-Mg Alloy with Sc and Zr Addition  

作　　者：郭宇航 ZHAO Naiqin SHI Chunsheng HE Chunnian LI Jiajun 刘恩佐 

机构地区：[1]Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University [2]Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2018年第3期680-687,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National High-tech Research&Development Program of China(No.2013AA031002)

摘　　要：The combined effects of pre-deformation and pre-aging on the mechanical properties of AlCu-Mg alloy with Sc and Zr addition were investigated. It is revealed that the introduction of pre-deformation can enhance the peak-aging strength, as well as tensile and yield strength, effectively due to the formation of finer and more dispersive precipitation. Pre-aging process before pre-deformation can increase the elongation while maintaining higher strength with a discontinuous distribution of precipitates at grain boundary. The precipitates of bean-like Al3（Sc, Zr） particles further strengthen the alloy via pinning the dislocations which are formed during pre-deformation process and hindering the dislocation motion. Furthermore, pre-deformation and pre-aging accelerate the kinetics of precipitation due to preferential sites provided by the dislocation and the increase of GPB zones＇ size and distribution. The synergism of pre-deformation and pre-aging achieves a combination of better mechanical properties and shorter peak-aging time.The combined effects of pre-deformation and pre-aging on the mechanical properties of AlCu-Mg alloy with Sc and Zr addition were investigated. It is revealed that the introduction of pre-deformation can enhance the peak-aging strength, as well as tensile and yield strength, effectively due to the formation of finer and more dispersive precipitation. Pre-aging process before pre-deformation can increase the elongation while maintaining higher strength with a discontinuous distribution of precipitates at grain boundary. The precipitates of bean-like Al3（Sc, Zr） particles further strengthen the alloy via pinning the dislocations which are formed during pre-deformation process and hindering the dislocation motion. Furthermore, pre-deformation and pre-aging accelerate the kinetics of precipitation due to preferential sites provided by the dislocation and the increase of GPB zones＇ size and distribution. The synergism of pre-deformation and pre-aging achieves a combination of better mechanical properties and shorter peak-aging time.

关 键 词：pre-deformation pre-aging mechanical properties Al-Cu-Mg-Sc-Zr alloy 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG131[金属学及工艺—金属材料]