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; Zen Ji Horita; Takayuki Narushima

doi:10.4028/www.scientific.net/KEM.616.263

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Microstructural Analysis of Biomedical Co-Cr-Mo Alloy Subjected to High-Pressure Torsion Processing

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, ε_eq. 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.

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Periodical:

Key Engineering Materials (Volume 616)

Pages:

263-269

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.616.263

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Online since:

June 2014

Authors:

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

Keywords:

Co-Cr-Mo Alloys, Grain Refinement, High-Pressure Torsion, Metallic Biomaterial, Strain-Induced ε Martensite Phase, Vickers Hardness

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