Effects of heating rate on the alloy element partitioning and mechanical properties in equiaxedα+βTi-6Al-4V alloy

查看全文 作　　者：Jinhu [1,2]Zhang;Hongtao [1,3,2]Ju;Haisheng [1,3,2]Xu;Liang [1,2]Yang;Zhichao [1,3,2]Meng;Chen [4]Liu;Ping [4]Sun;Jianke [1,3,2]Qiu;Chunguang [1,3,2]Bai;Dongsheng [1,3,2]Xu;Rui [1,3,2]Yang

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;[3]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[4]Safety Evaluation Center,Shenyang Research Institute of Chemical Industry Co.,Ltd.,Shenyang 110141,China

出　　处：《Journal of Materials Science & Technology》索引2021年第35期,共9页

基　　金：support from the National Natural Science Foundation of China(No.51701219);the Doctoral Scientific Research Foundation of Liaoning Province(No.20180540133);the Special Project on Information Technology of the Chinese Academy of Sciences(No.XXH13506–304)。 摘　　要：The effects of heating rate on the alloy element partitioning and mechanical properties during the phase transformation ofα→βin Ti-6Al-4 V alloy under solution treatment have been investigated by the experiments and phase field simulations,which reveal the evolutions of microstructure and compositions at the non-equilibrium state and well verify the experimental results.The specific results indicate that the compositions measured through electron probe micro-analysis(EPMA)under a lower heating rate are close to the equilibrium ones corresponding to the solution temperature.Heating up to the target solution temperature,as the heating rate increases,the Al content decreases and V increases in the primaryα(α_(p))grain with a larger size,the volume fraction ofα_(p)increases and the composition gradient betweenα_(p)andβphases gets steeper.The interrelated relationship among the diffusion,compositions,solution temperature and free energy of the system has been discussed in detail.Moreover,increasing the heating rate(~20.0 K/min)may help to improve the mechanical properties of the alloy by mainly adjusting theα_(p)/β;volume fractions,α_(p)particle size and secondaryα(α_(p))size during the process of heating up to the solution temperature.These results may shed some light on the optimization of the knowledge-based heat treatment route. 关键词：Heating rate Alloying element partitioning Microstructure morphology Mechanical properties

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Effects of heating rate on the alloy element partitioning and mechanical properties in equiaxedα+βTi-6Al-4V alloy

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