Abstract Oxygen diffusion layers were formed on Ti–6Al–4V by thermal oxidation at a temperature of 850 °C for three and six hours. The presence of interstitial oxygen led to a partial transformation of β-Ti to α-Ti and increased “c/a” ratio of hcp structure from 1.597 for Ti–6Al–4V to 1.610 and 1.611 for three- and six-hour oxidation processes, respectively. Tribocorrosion experiments in phosphate buffered saline (PBS) solution were conducted on the samples under various normal loads of 7.5, 15 and 30 N against an alumina ball as the counterpart. The wear surfaces and subsurfaces of the ODLs showed limited plastic deformation during tribocorrosion; due to obstacles provided by oxygen diffusion against dislocation slip. This was attributed to a higher hardness and c/a ratio of α-Ti hcp and a lower work of plastic deformation. SEM, TEM and SAED patterns of the ODL wear regions in conjunction with electrochemical measurements showed different plastic deformation modes and tribo-electrochemical responses during tribocorrosion compared with Ti-6Al-4V, which led to a decrease in tribocorrosion rate by up to 25 times.

中文翻译：

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PBS溶液中Ti-6Al-4V氧扩散层摩擦腐蚀过程中机械磨损与电化学腐蚀的相互作用

摘要 通过在 850 °C 的温度下热氧化 3 和 6 小时，在 Ti-6Al-4V 上形成了氧扩散层。间隙氧的存在导致 β-Ti 部分转变为 α-Ti，并且 hcp 结构的“c/a”比从 Ti-6Al-4V 的 1.597 增加到 1.610 和 1.611（三小时和六小时氧化过程） ， 分别。在磷酸盐缓冲盐水 (PBS) 溶液中的摩擦腐蚀实验是在 7.5、15 和 30 N 的各种正常载荷下对作为对应物的氧化铝球对样品进行的。ODL 的磨损表面和亚表面在摩擦腐蚀过程中表现出有限的塑性变形；由于氧扩散对位错滑移的阻碍。这归因于更高的硬度和 α-Ti hcp 的 c/a 比以及更低的塑性变形功。扫描电镜，