高扩散性途径控制摩擦滑动过程中的大规模增强氧化
High diffusivity pathways govern massively enhanced oxidation during tribological sliding
摘要：
移动金属部件的寿命通常受到加速氧化的限制。然而，在摩擦学加载过程中氧化的机制和途径还没有很好地理解。以铜为模型系统，通过改变滑动速度和试验持续时间，在温和的摩擦学载荷下，摩擦诱导氧化进行了系统的研究。我们证明，摩擦氧化是由测试时间，而不是循环次数或滑动速度控制。来自摩擦负载的塑性形变产生位错、晶粒和相边界，其充当高扩散率路径。结合电子显微镜和原子探针断层扫描显示显着增强的原子浓度的扩散种周围的位错。氧扩散到块体以及铜朝向自由表面沿着这些缺陷控制氧化物形成动力学。我们的工作为制定基于物理学的摩擦氧化理解铺平了道路，这对于制定防止氧化的策略和策略性地定制表面以增加工程系统的寿命至关重要。
英文摘要：
The lifetime of moving metallic components is often limited by accelerated oxidation. Yet, the mechanisms and pathways for oxidation during tribological loading are not well understood. Using copper as a model system, tribologically-induced oxidation is systematically investigated by varying the sliding speed and test duration under mild tribological loading. We demonstrate that tribo-oxidation is controlled by test duration rather than the number of cycles or the sliding speed. Plastic deformation from tribological loading creates dislocations, grain and phase boundaries that act as high diffusivity pathways. A combination of electron microscopy and atom probe tomography revealed significantly enhanced atomic concentration of the diffusing species around dislocations. Oxygen diffusion into the bulk as well as of copper towards the free surface along these defects control the oxide formation kinetics. Our work paves the way for formulating a physics-based understanding for tribo-oxidation, which is crucial to develop strategies to prevent oxidation and to strategically tailor surfaces to increase the lifetime of engineering systems.
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