Tension-Compression Asymmetry in Ultrafine-grained Commercially Pure Ti Processed by ECAP

作     者：刘晓燕 LI Shuaikang YANG Xirong LUO Lei LIU Xiaoyan;LI Shuaikang;YANG Xirong;LUO Lei

作者机构：School of Metallurgical EngineeringXi'an University of Architecture and TechnologyXi'an 710055China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2023年第38卷第3期

页      面：689-694页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China (No.51474170) Natural Science Foundation of Shaanxi Province (No.2023-JC-YB-312) Key Laboratory Project of Shaanxi Province Educational Committee (No.20JS075) 

主　　题：ultrafine-grained commercially pure Ti equal channel angular pressing tensioncompression asymmetry texture twinning 

摘      要：A homogenous microstructure of ultrafine-grained (UFG) commercially pure (CP) Ti characterized by equiaxed grains/subgrains with an average grain size of about 150 nm and strong prismatic fiber texture were obtained after 4 passes of equal channel angular pressing (ECAP).Tension–compression asymmetry in yield and work hardening behavior of UFG CP Ti were investigated by uniaxial tension and compression *** experimental results reveal that UFG CP Ti exhibits a relatively obvious tensioncompression asymmetry in yielding and work hardening *** basal and prismaticslip are suppressed either for tension or compression,which is the easiest to *** tension twin system{1012} easily activated in compression deformation due to the prismatic fiber texture based on the Schmidt factor,consequently resulting in a lower yield strength under compression than *** can improve the tension-compression asymmetry of CP Ti due to grain *** interaction among the dislocations,grain boundaries and deformation twins are the main work hardening mechanisms for compression deformation,while the interaction between the dislocations and grain boundaries for tension *** twins lead to the higher work hardening under compression than tension.