Analysis of crystallographic orientation and morphology of microstructure during hot working for an alpha/beta titanium alloy  

作　　者：Jianwei Xu Weidong Zeng Dadi Zhou Wei Chen Shengtong He Xiaoyong Zhang 

机构地区：[1]State Key Laboratory of Solidification Processing,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an,710072,China [2]Defense Technoloies Innovation Center of Precision Forging and Ring Rolling,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an,710072,China [3]State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,China

出　　处：《Journal of Materials Science & Technology》2020年第24期1-13,共13页材料科学技术（英文版）

基　　金：support of the project from the National Natural Science Foundation of China(NO.51905436);China Postdoctoral Science Foundation(2019M653727);the Fundamental Research Funds for the Central Universities(3102019TS0404)。

摘　　要：This work focuses on analysis of microstructure morphology and crystallographic orientation for Ti-17 alloy during hot working.The results show that alpha phase and beta phase influence each other and there is a coordinate deformation between them.The non-uniform deformation is observed under small deformation conditions.The observing area can be divided into small deformation zone(area L)and large deformation zone(area H).Both alpha and beta phases remain the initial morphology,and they have better capability of coordinate deformation in area L,while coordinate capability is weak in area H in which alpha phase is globularized.Correspondingly,the Burgers orientation relations are well preserved in area L,but the orientation relations are more or less destroyed in area H.Dynamic recovery is the main mechanism of beta phase evolution when height reduction is lower.By contrast,the continuous dynamic recrystallization(CDRX)of beta phase gradually dominates the deformation pattern as the deformation increases.An uniformly globularized alpha structure is obtained under large deformation condition.The unsynchronized rotation of alpha phase around<11-20>pole occurs during deformation,which leads to the uniform crystal structure inside the same alpha lamellae.This process is an important step of globularization of the lamellar structure.

关 键 词：Ti-17 alloy Hot working Microstructure evolution Crystallographic orientation 

分 类 号：TG146.23[一般工业技术—材料科学与工程]