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Open AccessFeature PaperArticle

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

Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259-J2-63 Nagatsuta, Yokohama 226-8502, Japan
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Metals 2020, 10(5), 654; https://doi.org/10.3390/met10050654
Received: 3 May 2020 / Revised: 15 May 2020 / Accepted: 16 May 2020 / Published: 19 May 2020
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. View Full-Text
Keywords: copper; ultra-fine grains; equal-channel angular pressing; digital image correlation; shear deformation; shear band localization copper; ultra-fine grains; equal-channel angular pressing; digital image correlation; shear deformation; shear band localization
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Matsutani, R.; Nakada, N.; Onaka, S. Increase in Total Elongation Caused by Pure Shear Deformation in Ultra-Fine-Grained Cu Processed by Equal-Channel Angular Pressing. Metals 2020, 10, 654.

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