Phase transformation and structural evolution in a Ti-5at.%Al alloy induced by cold-rolling

作     者：Bingqiang Wei Song Ni Yong Liu Xiaozhou Liao Min Song Bingqiang Wei;Song Ni;Yong Liu;Xiaozhou Liao;Min Song

作者机构：State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083China School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneySydneyNSW 2006Australia 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第47卷第14期

页      面：211-223页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 080201[工学-机械制造及其自动化] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financial supports from National Natural Science Foundation of China(51828102) Australian Research Council(DP190102243)。 

主　　题：Ti-Al alloy Deformation mechanism Phase transformation Grain refinement Deformation twinning 

摘      要：The phase transformation,deformation mechanism and their correlation in a cold-rolled Ti-5 at.%Al alloy were investigated.Two types of phase transformations from a hexagonal close-packed(HCP)structure to a face-centered cubic(FCC)structure were observed:the basal-type(B-type)with an orientation relation-ship ofaxis of the HCP matrix.With the proceeding of deformation,different deformation mechanisms were activated in the FCC and the HCP structures,respectively,which led to a faster grain refinement rate in the FCC structure than in the HCP matrix.Deformation twins with zero macroscopic strain were prevalent in the FCC domains produced by the B-type transformation,while deformation twins with macroscopic strain were normally observed in the FCC domains produced by the P-type transformation.This is in accordance with the lattice mismatches produced during phase transformation.The easy occurrence of deformation twinning in the FCC structure contributed significantly to the grain refinement process.In addition,the interaction between neighboring FCC domains produced by the two types of phase transformations also accelerated the grain refinement process.