Processing of an ultrafine-grained titanium by high-pressure torsion: an evaluation of the wear properties with and without a TiN coating
Wang, Chuan Ting, Gao, Nong, Gee, Mark, Wood, R.J.K. and Langdon, Terence G. (2013) Processing of an ultrafine-grained titanium by high-pressure torsion: an evaluation of the wear properties with and without a TiN coating. Journal of the Mechanical Behavior of Biomedical Materials, 17, 166-175.
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A commercial purity (CP) Grade 2 Ti was processed by high-pressure torsion (HPT) using an imposed pressure of 3.0 GPa at room temperature. The HPT processing reduced the grain size from ~8.6 ?m in the as-received state to ultra-fine grains (UFG) of ~130 nm after HPT. Tensile testing showed the HPT-processed Ti exhibited a good combination of high ultimate tensile strength (~940 MPa) and a reasonable elongation to failure (~23 %). Physical vapour deposition was used to deposit TiN coatings, with a thickness of 2.5 ?m, on Ti samples both with and without HPT processing. Scratch tests showed the TiN coating on UFG Ti had a critical failure load of ~22.5 N whereas the load was only ~12.7 N for the coarse-grained Ti. The difference is explained using a simple composite hardness model.
Wear tests demonstrated an improved wear resistance of TiN coating when using UFG Ti as the substrate. The results suggest that CP Ti processed by HPT and subsequently coated with TiN provides a potentially important material for use in bio-implants.
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
|Divisions:||Faculty of Engineering and the Environment > Engineering Sciences > Engineering Materials Surface Engineering
|Date Deposited:||28 Aug 2012 14:34|
|Last Modified:||31 Mar 2016 14:33|
MEMS COMPONENTS FORMED FROM NANOSTRUCTURAL METALS
Funded by: EPSRC (EP/D00313X/1)
Led by: Nong Gao
1 August 2006 to 31 October 2009
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