Microstructural analysis of biomedical Co-Cr-Mo alloy subjected to high-pressure torsion processing

Murat Isik, Mitsuo Niinomi, Ken Cho, Masaaki Nakai, Junko Hieda, Hakan Yilmazer, Zenji Horita, Takayuki Narushima

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The effect of high-pressure torsion (HPT) processing on the microstructure and Vickers hardness of Co-Cr-Mo (CCM) alloys were investigated in this study. The microstructure of initial CCM alloy contains equiaxed grains with a grain diameter of approximately 50 μm and twins. The clear grain boundaries of equiaxed grains and twins disappear after HPT processing at a rotation number, N, of 10. The phase maps of initial CCM alloy and CCM alloy subjected to HPT processing at N = 5 measured by electron backscatter diffraction exhibit that the ratio of γ phase decreases from 93.5% to 34.1% and the ratio of ε phase increases from 6.5% to 65.9% by applying HPT processing. These results indicate that the ε phase is formed by high-strain, which is induced by the HPT processing. The Vickers hardness values on the surfaces of the CCM alloys subjected to HPT processing at N = 1, 5, and 10 increase with increasing the equivalent strain, εeq. These results suggest that an increase of Vickers hardness is correlated to an increase of the ratio of ε phase and the dislocation density, and grain refinement, which are caused by the high-strain induced by HPT processing.

Original languageEnglish
Title of host publicationAdvanced Ceramics and Novel Processing
PublisherTrans Tech Publications Ltd
Pages263-269
Number of pages7
ISBN (Print)9783038351306
DOIs
Publication statusPublished - Jan 1 2014
Event5th International Symposium on Advanced Ceramics, ISAC 2013 and 3rd International Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2013 - Wuhan, China
Duration: Dec 9 2013Dec 12 2013

Publication series

NameKey Engineering Materials
Volume616
ISSN (Print)1013-9826

Other

Other5th International Symposium on Advanced Ceramics, ISAC 2013 and 3rd International Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2013
CountryChina
CityWuhan
Period12/9/1312/12/13

Fingerprint

Torsional stress
Processing
Vickers hardness
Microstructure
Grain refinement
Electron diffraction
Grain boundaries

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Isik, M., Niinomi, M., Cho, K., Nakai, M., Hieda, J., Yilmazer, H., ... Narushima, T. (2014). Microstructural analysis of biomedical Co-Cr-Mo alloy subjected to high-pressure torsion processing. In Advanced Ceramics and Novel Processing (pp. 263-269). (Key Engineering Materials; Vol. 616). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.616.263

Microstructural analysis of biomedical Co-Cr-Mo alloy subjected to high-pressure torsion processing. / Isik, Murat; Niinomi, Mitsuo; Cho, Ken; Nakai, Masaaki; Hieda, Junko; Yilmazer, Hakan; Horita, Zenji; Narushima, Takayuki.

Advanced Ceramics and Novel Processing. Trans Tech Publications Ltd, 2014. p. 263-269 (Key Engineering Materials; Vol. 616).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Isik, M, Niinomi, M, Cho, K, Nakai, M, Hieda, J, Yilmazer, H, Horita, Z & Narushima, T 2014, Microstructural analysis of biomedical Co-Cr-Mo alloy subjected to high-pressure torsion processing. in Advanced Ceramics and Novel Processing. Key Engineering Materials, vol. 616, Trans Tech Publications Ltd, pp. 263-269, 5th International Symposium on Advanced Ceramics, ISAC 2013 and 3rd International Symposium on Advanced Synthesis and Processing Technology for Materials, ASPT 2013, Wuhan, China, 12/9/13. https://doi.org/10.4028/www.scientific.net/KEM.616.263
Isik M, Niinomi M, Cho K, Nakai M, Hieda J, Yilmazer H et al. Microstructural analysis of biomedical Co-Cr-Mo alloy subjected to high-pressure torsion processing. In Advanced Ceramics and Novel Processing. Trans Tech Publications Ltd. 2014. p. 263-269. (Key Engineering Materials). https://doi.org/10.4028/www.scientific.net/KEM.616.263
Isik, Murat ; Niinomi, Mitsuo ; Cho, Ken ; Nakai, Masaaki ; Hieda, Junko ; Yilmazer, Hakan ; Horita, Zenji ; Narushima, Takayuki. / Microstructural analysis of biomedical Co-Cr-Mo alloy subjected to high-pressure torsion processing. Advanced Ceramics and Novel Processing. Trans Tech Publications Ltd, 2014. pp. 263-269 (Key Engineering Materials).
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