Effect of Environment on Microstructure Evolution and Friction of Au–Ni Multilayers
Effect of Environment on Microstructure Evolution and Friction of Au–Ni Multilayers
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DOI：
10.1007/s11249-019-1245-9
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发表时间：
2020-01
影响因子：
3.2
通讯作者：
Ebru Cihan;K. Jungjohann;N. Argibay;M. Chandross;M. Dienwiebel
中科院分区：
文献类型：
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作者：
Ebru Cihan;K. Jungjohann;N. Argibay;M. Chandross;M. Dienwiebel
我们提出了系统研究环境对不同层间距的Au-Ni多层膜摩擦行为的影响的结果。目前的结果是在干燥的n2气氛中滑动红宝石球，与之前在超高真空（UHV）下对这些材料的摩擦学行为的研究进行了比较（Cihan等人在Sci Rep 9:1 - 10,2019）。在这两种情况下，当层间距较大时存在高摩擦区，当层间距较小时存在低摩擦区。低摩擦状态与临界晶粒尺寸有关，低于该尺寸，晶界滑动将成为主要的变形机制。剪切诱导合金形成（60-65℃）。在超高压下，多层材料的间距为20nm或更低，摩擦系数较低。在干燥的N2中发现了不同的微观结构，这归因于吸附物质的不同界面特征；只有最上层的Au层受到剪切作用，而不是Au层和Ni层之间的混合作用。这些观察结果与多层样品在不同环境下滑动的摩擦磨损行为相结合。
We present results from a systematic investigation of environmental effects on the frictional behavior of Au–Ni multilayer films of varying interlayer spacing. The current results, sliding against ruby spheres in a dry N2atmosphere, are compared to prior work on the tribological behavior of these materials under ultra-high vacuum (UHV) (Cihan et al. in Sci Rep 9:1–10, 2019). Under both conditions, there is a regime of high friction when the interlayer spacing is large and a regime of low friction when the spacing is small. The low friction regime is associated with a critical grain size below which grain boundary sliding is expected to be the dominant mechanism of deformation. A shear-induced alloy formation (60–65 at.% Ni in Au) and a concomitant low friction coefficient was observed with multilayer spacings of 20 nm and lower under UHV. A distinct microstructure was found in dry N2, and is attributed to different interfacial characteristics due to adsorbed species; rather than mixing between Au and Ni layers, only the uppermost Au layers were affected by shearing. These observations are coupled with the friction and wear behavior of multilayer samples sliding under different environments.