Atomic-scale friction between single-asperity contacts unveiled through in situ transmission electron microscopy
Atomic-scale friction between single-asperity contacts unveiled through in situ transmission electron microscopy
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DOI：
10.1038/s41565-022-01126-z
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发表时间：
2022-05
影响因子：
38.3
通讯作者：
Xiang Wang;Zhenyu Liu;Yang He;Susheng Tan;Guofeng Wang;S. Mao
中科院分区：
文献类型：
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作者：
Xiang Wang;Zhenyu Liu;Yang He;Susheng Tan;Guofeng Wang;S. Mao
摩擦和磨损对具有机械元件的产品的功能有害，并降低其使用寿命。在这里，我们通过高分辨率透射电子显微镜研究了由压电致动器引起的反运动中的纳米接触，实时揭示了单个钨粗糙体的原子尺度摩擦。分子动力学模拟可以深入了解界面原子的滑动路径和界面上的动态应变/应力演化。我们观察到一个离散的粘滑行为和应变能的积累和耗散的异步过程，以及界面原子的非均匀运动。我们的方法允许研究原位原子摩擦现象，并提供了在原子尺度上的摩擦现象的见解。
Friction and wear are detrimental to functionality and reduce the service life of products with mechanical elements. Here, we unveil the atomic-scale friction of a single tungsten asperity in real time through a high-resolution transmission electron microscopy investigation of a nanocontact in countermotion, induced through a piezo actuator. Molecular dynamics simulations provide insights into the sliding pathway of interface atoms and the dynamic strain/stress evolution at the interface. We observe a discrete stick–slip behaviour and an asynchronous process for the accumulation and dissipation of the strain energy together with the non-uniform motion of interface atoms. Our methodology allows for studying in situ atomic-friction phenomena and provides insights into friction phenomena at the atomic scale.