Abstract Titanium alloys have been widely used for medical devices and structural applications. However, conventional titanium alloys often suffer from low resistance to wear, particularly at elevated temperatures. Herein, an equiatomic TiMoNb compositionally complex alloy (CCA) is shown to exhibit wear resistance comparable to alumina at room temperature (RT). Even at 600 °C, the alloy still shows an extremely low wear rate of the order of 10−6 mm3/(N·m). The remarkable wear resistance is achieved via tuning the interfacial structure and chemistry in TiMoNb CCA, including nanostructuring, titanium segregation at the grain boundaries, and the formation of a high density of nanoscale coherent Ti-rich precipitates with cube-on-cube orientation relationship with the ultrafine-grained matrix. The present results provide significant insights into the design of novel alloys for service in harsh environments.

中文翻译：

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通过调整界面结构和化学成分，在成分复杂的合金中实现卓越的耐磨性

摘要 钛合金已广泛用于医疗器械和结构应用。然而，传统的钛合金通常耐磨性低，特别是在高温下。在此，等原子 TiMoNb 成分复杂的合金 (CCA) 显示出在室温 (RT) 下表现出与氧化铝相当的耐磨性。即使在 600 °C 时，合金仍显示出 10-6 mm3/(N·m) 数量级的极低磨损率。显着的耐磨性是通过调整 TiMoNb CCA 中的界面结构和化学来实现的，包括纳米结构、晶界处的钛偏析以及形成高密度的纳米级连贯富钛沉淀物，立方体与立方体的取向关系与超细粒度矩阵。