Microstructure evolution and strengthening mechanism of high -performance powder metallurgy TA15 titanium alloy by hot rolling  

作　　者：Ying Gao Ce Zhang Jiazhen Zhang Xin Lu 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,Institute for Advanced Ma-terials and Technology,University of Science and Technology Beijing,Beijing 100083,China [2]National Engineering Research Center for Advanced Rolling Technology,National Engineering Research Center for Flat Rolling Equipment,Institute of Engin-eering Technology,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第6期1426-1436,共11页矿物冶金与材料学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52274359);Guangdong Basic and Applied Basic Research Foundation,China(No.2022A1515110406);Beijing Natural Science Foundation,China(No.2212035);the Fundamental Research Funds for the Central Universities,China(Nos.FRF-TP-19005C1Z and 00007718);the Aeroengine Group University Research Cooperation Project,China(No.HFZL2021CXY021);the State Key Lab of Advanced Metals and Materials,University of Science and Technology Beijing,China(Nos.2021Z-03 and 2022Z-14).

摘　　要：Hot deformation of sintered billets by powder metallurgy(PM)is an effective preparation technique for titanium alloys,which is more significant for high-alloying alloys.In this study,Ti–6.5Al–2Zr–Mo–V(TA15)titanium alloy plates were prepared by cold press-ing sintering combined with high-temperature hot rolling.The microstructure and mechanical properties under different process paramet-ers were investigated.Optical microscope,electron backscatter diffraction,and others were applied to characterize the microstructure evolution and mechanical properties strengthening mechanism.The results showed that the chemical compositions were uniformly dif-fused without segregation during sintering,and the closing of the matrix craters was accelerated by increasing the sintering temperature.The block was hot rolled at 1200℃ with an 80%reduction under only two passes without annealing.The strength and elongation of the plate at 20–25℃ after solution and aging were 1247 MPa and 14.0%,respectively,which were increased by 24.5%and 40.0%,respect-ively,compared with the as-sintered alloy at 1300℃.The microstructure was significantly refined by continuous dynamic recrystalliza-tion,which was completed by the rotation and dislocation absorption of the substructure surrounded by low-angle grain boundaries.After hot rolling combined with heat treatment,the strength and plasticity of PM-TA15 were significantly improved,which resulted from the dense,uniform,and fine recrystallization structure and the synergistic effect of multiple slip systems.

关 键 词：elemental powder powder metallurgy titanium alloy hot rolling strength and plasticity 

分 类 号：TF125.22[冶金工程—粉末冶金] TG339[冶金工程—冶金物理化学]