文献类型：期刊文献

英文题名：Microstructural Evolution and Element Partitioning in the Phase Transformation of Ti-17 Alloy under Continuous Heating and Cooling Conditions

作者：An, Xudong Cai, Xin Wan, Mingpan Lei, Min Huang, Chaowen Zhao, Fei Huang, Fang

第一作者：An, Xudong

通信作者：Wan, MP[1];Wan, MP[2]

机构：[1]Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;[2]Key Lab Mat Struct & Strength Guizhou Prov, Guiyang 550025, Peoples R China;[3]Guizhou Inst Technol, Sch Aerosp Engn, Guiyang 550003, Peoples R China

第一机构：Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Coll Mat & Met, Guiyang 550025, Peoples R China;corresponding author), Key Lab Mat Struct & Strength Guizhou Prov, Guiyang 550025, Peoples R China.

年份：2020

卷号：10

期号：8

起止页码：1-11

外文期刊名：METALS

收录：;Scopus(收录号：2-s2.0-85089531516);WOS:【SCI-EXPANDED(收录号:WOS:000564680500001)】；

基金：This project was financially supported by the Nation Natural Science Foundation of China (Grant No. 51401058 and 51801037) and the Natural science foundation of Guizhou province (Grant No. [2017]1023) and the Project of Science and Technology of Guizhou province (Grant No. [2017]2313). We also appreciate the Talent Introduction Project of Guizhou Institute of Technology (Grant No. XJGC20190950)

语种：英文

外文关键词：Ti-17 alloy; microstructural evolution; element partitioning; heating and cooling

摘要：The microstructural evolution and alloying element partitioning in the alpha + beta <-> beta phase transformation of Ti-17 alloy were explored under continuous heating and cooling conditions using the dilatometric method. Scanning electron microscopy and transmission electron microscopy were used to evaluate microstructural characteristics and trace alloying element partitioning behaviors occurring at different temperatures during heating and cooling. Results showed that the finer needle-like alpha phase first dissolved into the beta phase in the matrix with increasing temperature, while the grain boundary alpha phase first coarsened and then transformed gradually into beta phase during continuous heating. The dissolution of alpha phase of the alloy with the alloying element partitioning during continuous heating was observed. On the contrary, alpha(GB)formed at the prior beta grain of the alloy during continuous cooling, which might be the nuclei of alpha colony, thus resulting in the formation of alpha colony in the matrix. As the temperature decreased, the elements' concentrations in the alpha and beta phases became increasingly varied due to element partition. Moreover, Al and Cr, which had higher diffusion coefficients than Mo, easily reached the concentration equilibrium of alloying elements in the alpha and beta phases, respectively. The shrinkage of dilatometric curves during heating in the Ti-17 alloy are mainly attributed to the change of alpha-HCP (hexagonal close-packed) lattice to beta-BCC (body-centered cubic) lattice; while the element partitioning during the beta -> alpha + beta transformation plays an important role in the shrinkage of the dilatometric curves of the Ti-17 alloy during cooling.