Low friction of metallic multilayers by formation of a shear-induced alloy
Low friction of metallic multilayers by formation of a shear-induced alloy
复制标题
DOI：
10.1038/s41598-019-45734-7
复制
发表时间：
2019-07
影响因子：
4.6
通讯作者：
Ebru Cihan;H. Störmer;H. Leiste;M. Stüber;M. Dienwiebel
中科院分区：
文献类型：
--
作者：
Ebru Cihan;H. Störmer;H. Leiste;M. Stüber;M. Dienwiebel
在金属表面滑动过程中，近表面的形貌、成分和微观结构发生显着变化。由于材料的摩擦和磨损行为受到次表面变形的强烈影响，因此研究这些影响至关重要。因此，本研究旨在更好地理解取决于明确的初始微观结构的摩擦行为。通过在超高真空（UHV）条件下对金镍多层样品进行滑动实验，我们观察到，由于表面附近主要变形机制的转变，多层系统的单层厚度对摩擦行为有很大影响。这里报道的实验通过提供更稳定的微观结构和合金形成，为降低干接触金属材料系统的摩擦力提供了一条新途径。通过机械混合形成的合金中存在的超细晶粒，晶界的数量急剧增加，因此，晶界介导的变形导致低摩擦系数。
During sliding of metallic surfaces, the near surfaces undergo significant changes in terms of topography, composition and microstructure. Since friction and wear behavior of the materials are strongly influenced by sub-surface deformations, it is fundamental to investigate these effects. Therefore, the present study aims towards a better understanding of the behavior of friction depending on well-defined initial microstructures. By performing sliding experiments on Au-Ni multilayer samples under ultrahigh vacuum (UHV) conditions, we observe that the individual layer thickness of multilayer systems has a strong influence on friction behavior due to the transition in the dominant deformation mechanism near the surface. The experiments reported here provide a new route for lowering the friction force of metallic material systems in dry contact by providing more stable microstructures and alloy formation. Through ultrafine grains present in the alloy formed by mechanical mixing the number of grain boundaries strongly increases and hence, grain boundary-mediated deformation results in the low friction coefficient.