AI Article Synopsis
- A commercial purity Grade 2 titanium (Ti) underwent high-pressure torsion (HPT) at 3.0 GPa, reducing grain size from ~8.6 μm to ultra-fine grains of ~130 nm.
- Tensile tests revealed that the HPT-processed Ti achieved high ultimate tensile strength (~940 MPa) and reasonable elongation to failure (~23%).
- TiN coatings applied via physical vapor deposition on UFG Ti exhibited significantly better scratch resistance and wear resistance compared to coatings on coarse-grained Ti, suggesting its potential use in bio-implants.
Article Abstract
A commercial purity (CP) Grade 2 Ti was processed by high-pressure torsion (HPT) using an imposed pressure of 3.0GPa at room temperature. The HPT processing reduced the grain size from ∼8.6 μm 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 μm, 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.
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| http://dx.doi.org/10.1016/j.jmbbm.2012.08.018 | DOI Listing |
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