Microstructural evolution and mechanical behavior of in situ synthesized MgAl_(2)O_(4)whiskers reinforced 6061 Al alloy composite after hot extrusion and annealing  

作　　者：Geng Hao Chun-Sheng Shi Nai-Qin Zhao En-Zuo Liu Chun-Nian He Fang He Li-Ying Ma 

机构地区：[1]School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China [2]Tianjin Key Laboratory of Composite and Functional Materials,Tianjin University,Tianjin 300350,China [3]Collaborative Innovation Centre of Chemical Science and Engineering,Tianjin 300072,China

出　　处：《Rare Metals》2023年第5期1732-1742,共11页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.51571147)。

摘　　要：In situ synthesized MgAl2O4whiskers reinforced 6061 Al alloy composites were fabricated by a powder metallurgy method.Nano-sized MgAl2O4spinel whiskers distributed uniformly in 6061 Al alloy matrix without any interfacial product and laid along the extrusion direction after hot extrusion.As-extruded composite samples were annealed at 530,580,600 and 630℃for 1 h and examined by electron backscattered diffraction to investigate the recrystallization behavior of obtained composites.Microstructure and texture evolution was investigated,and it is found that the recrystallization process is inhibited by whiskers because of Zener pinning.Slender fibrous grains remain until 630℃,and deformation textures still exist even in specimen annealed at 630℃.Hardness and tensile tests show that the completely recrystallized sample has an ultimate tensile strength of 218 MPa and a hardness of HV52 compared with 283 MPa and HV 69 of the unannealed sample.Mechanical properties of the annealed samples decline slightly with annealing temperature increasing up to 600℃.

关 键 词：COMPOSITE In situ synthesized whiskers Recrystallization Microstructure Texture 

分 类 号：TF123[冶金工程—粉末冶金] TB333[冶金工程—冶金物理化学]