Effects of hot deformation and in-situ ZrB2 particle on microstructure and tensile performance of AA7085 composite sheets  

作　　者：Jiang-jing Wu Xi-zhou Kai Chuang Guan Yu-tao Zhao 

机构地区：[1]School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China

出　　处：《Journal of Iron and Steel Research International》2024年第7期1778-1791,共14页钢铁研究学报（英文版）

基　　金：financial support of the National Natural Science Foundation of China (Nos.U20A20274,52071158,51701085,and U1664254);the Six Talents Peak Project of Jiangsu Province (2018-XCL-202);the Open Funds of SKLMMC of SJTU (MMC-KF18-16);the Jiangsu Provincial Key Laboratory of High-End Structural Materials (HSM1803,1902).

摘　　要：To provide a new idea to reduce anisotropy for sheets in the thickness direction by microstructure modification and,mean-while,maintain or even enhance tensile performance,the in-situ ZrB2 particle/AA7085 composite sheets with thicknesses of 1,2,3,and 6 mm were investigated.The as-cast grain size was significantly refined by the heterogeneous nucleus of the ZrB2 particle.The microstructure results show that severe hot deformation converts as-cast disordered microstructure into a sequential microstructure by crushing the remanent phases and matrix into a fiber structure.After the solid solution and aging heat treatment,the composite sheets exhibit largely recrystallized grains compared with partially recrystallized grains in the matrix sheets,and weak or even free texture exists in the composite.The grain size in the composite sheets decreases with the increase in thickness reductions.For the thickness range of 1-3 mm,the composite sheets maintain a similar tensile per-formance as that in matrix sheets,while the strength and ductility in the 6-mm-thick composite sheet are improved.

关 键 词：Composite sheet Grain structure TEXTURE DISLOCATION Strengthening 

分 类 号：TB33[一般工业技术—材料科学与工程]