Shear fracture mechanism in micro-tension of an ultrafine-grained pure copper using synchrotron radiation X-ray tomography

SCRIPTA MATERIALIA

卷:132

Article

Li, Jianwei^1,2  Xu, Jie^1,2  Guo, Bin^1,2  Shan, Debin^1,2  Langdon, Terence G.^3,4,5 

[1] Harbin Inst Technol, Key Lab Microsyst & Microstruct Mfg, Minist Educ, Harbin 150080, Peoples R China

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[3] Univ Southern Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA

[4] Univ Southern Calif, Dept Mat Sci, Los Angeles, CA 90089 USA

[5] Univ Southampton, Fac Engn & Environm, Mat Res Grp, Southampton SO17 1BJ, Hants, England

关键词: Equal-channel angular pressing;    Fracture;    Micro-forming;    Synchrotron X-ray tomography;    Ultrafine grains;   

DOI  :  10.1016/j.scriptamat.2017.01.021

来源: Elsevier

【 摘 要 】

In order to investigate the early fracture of ultrafine-grained (UFG) pure copper with a partially recrystallized microstructure and simple shear texture, the evolution of surface strain was measured using in situ micro-tension with digital image correlation. The spatial distribution of voids in tensile specimens was revealed after testing using synchrotron radiation X-ray tomography. The results show that the shear fracture behavior is associated with void evolution in UFG copper and this is strongly affected by the simple shear texture produced by equal channel angular pressing (ECAP). The results have important implications for use in micro-forming. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free