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Quantum Beam Sci. 2018, 2(2), 11; https://doi.org/10.3390/qubs2020011

Strain-Induced Martensitic Transformation and Texture Evolution in Cold-Rolled Co–Cr Alloys

1
Frontier Research Center for Applied Atomic Sciences, Ibaraki University, 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
2
Graduate School of Science and Engineering, Ibaraki University, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 316-8511, Japan
3
Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
4
Department of Materials and Environmental Engineering, National Institute of Technology, Sendai College Natori, 48 Nodayama, Medeshima-Shiote, Natori 981-1239, Japan
*
Author to whom correspondence should be addressed.
Received: 31 March 2018 / Revised: 9 May 2018 / Accepted: 16 May 2018 / Published: 22 May 2018
(This article belongs to the Special Issue Strain, Stress and Texture Analysis with Quantum Beams)
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Abstract

Co–Cr alloys have been used in biomedical purposes such as stents and artificial hip joints. However, the difficulty of plastic deformation limits the application of the alloys. During the deformation, Co–Cr alloys often exhibit strain-induced martensitic transformation (SIMT), which is a possible reason for the low formability. The distinct increase in dislocation density in the matrix phase may also result in early fractures. Since these microstructural evolutions accompany the textural evolution, it is crucial to understand the relationship among the SIMT, the increase in dislocations, and the texture evolution. To characterize those at the same time, we conducted time-of-flight neutron diffraction experiments at iMATERIA beamline at the Japan Proton Accelerator Research Complex (J-PARC) Materials and Life Science Experimental Facility (MLF), Ibaraki, Japan. The cold-rolled sheets of Co–29Cr–6Mo (CCM) and Co–20Cr–15W–10Ni (CCWN) alloys were investigated in this study. As expected from the different stacking fault energies, the SIMT progressed more rapidly in the CCM alloy. The dislocation densities of the matrix phases of the CCM and CCWN alloys increased similarly with an increase in the rolling reduction. These results suggest that the difference in deformability between the CCM and CCWN alloys originate not from the strain hardening of the matrix phase but from the growth behaviors of the martensitic phase. View Full-Text
Keywords: Co–Cr alloy; strain-induced martensite transformation; neutron diffraction; iMATERIA; texture; phase fraction; dislocation density; CMWP method Co–Cr alloy; strain-induced martensite transformation; neutron diffraction; iMATERIA; texture; phase fraction; dislocation density; CMWP method
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Onuki, Y.; Sato, S.; Nakagawa, M.; Yamanaka, K.; Mori, M.; Hoshikawa, A.; Ishigaki, T.; Chiba, A. Strain-Induced Martensitic Transformation and Texture Evolution in Cold-Rolled Co–Cr Alloys. Quantum Beam Sci. 2018, 2, 11.

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