الفهرس 
Effect of thermal oxidation on the tribological behavior of Ti6Al4V and Ti6Al7Nb biomedical alloys
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Abstract
The alpha / beta titanium alloy Ti6Al7Nb named as (Ti67) was recently developed as metallic biomaterial to overcome the toxic issue related to vanadium release in the human body for the commercial Ti6Al4V (Ti64) alloy. Thermal oxidation is an important surface treatment performed to bio-implants to enhance their hardness and wear properties. Therefore, it is of interest to investigate the influence of thermal oxidation on the surface properties of Ti67 alloy in its forged and cast conditions and compare the results to the commonly used Ti64 alloy. It was observed that the thickness of alpha case formed in Ti64 after oxidation at (900-1100 {u00B0}C) was greater than in Ti67. In addition, the equiaxed microstructure of the forged samples showed thicker alpha case than in the widmanstätten microstructure of the cast samples for the two alloys. Both forged and cast Ti64 showed significant improvement in dry sliding wear resistance after thermal oxidation at 900 {u00B0}C and 1100 {u00B0}C, while alloy Ti67 showed less improvement in spite of the improved surface hardness