Increase in Total Elongation Caused by Pure Shear Deformation in Ultra-Fine-Grained Cu Processed by Equal-Channel Angular Pressing

被引：4
作者：
Matsutani, Ryosuke [1 ]
Nakada, Nobuo [1 ]
Onaka, Susumu [1 ]
机构：
[1] Tokyo Inst Technol, Dept Mat Sci & Engn, 4259-J2-63 Nagatsuta, Yokohama, Kanagawa 2268502, Japan
来源：
METALS | 2020年 / 10卷 / 05期
关键词：
copper; ultra-fine grains; equal-channel angular pressing; digital image correlation; shear deformation; shear band localization; SEVERE PLASTIC-DEFORMATION; TENSILE DEFORMATION; AL ALLOYS; STRENGTH;
D O I：
10.3390/met10050654
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Ultra-fine-grained (UFG) Cu shows little total elongation in tensile tests because simple shear deformation is concentrated in narrow regions during the initial stage of plastic deformation. Here, we attempted to improve the total elongation of UFG Cu obtained by equal-channel angular pressing. By making shallow dents on the side surfaces of the plate-like specimens, this induced pure shear deformation and increased their total elongation. During the tensile tests, we observed the overall and local deformation of the dented and undented UFG Cu specimens. Using three-dimensional digital image correlation, we found that the dented specimens showed suppression of thickness reduction and delay in fracture by enhancement of pure shear deformation. However, the dented and undented specimens had the same ultimate tensile strength. These results provide us a new concept to increase total elongation of UFG materials.
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页数：11
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