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Tribology testing of ultrafine-grained Ti processed by high-pressure torsion with subsequent coating |
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| Authors: | Chuan Ting Wang Nong Gao Mark G. Gee Robert J. K. Wood Terence G. Langdon |
| Affiliation: | 1. National Centre for Advanced Tribology at Southampton, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK 2. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK 3. National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW16 5PT, UK 4. Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles, CA, 90089-1453, USA |
| Abstract: | A grade 2 pure Ti was processed by high-pressure torsion (HPT) under 3.0 GPa for 10 revolutions to achieve an improved strength. Wear tests revealed that HPT only slightly improved the wear resistance of pure Ti. Subsequently, a TiN coating with a thickness of 2.5 μm was deposited on different Ti substrates to improve the wear resistance. Both indentation and scratch testing demonstrated a much improved load-bearing capacity when ultrafine-grained Ti was chosen as the substrate compared with coarse-grained Ti. All results indicate that pure Ti processed by HPT, when combined with a subsequent coating, represents a good candidate material for bio-implant applications. |
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