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Atomic Origins of Friction Reduction in Metal Alloys
Tribology Letters ( IF 3.2 ) Pub Date : 2021-05-06 , DOI: 10.1007/s11249-021-01442-w
Shengfeng Cheng , Michael Chandross

We present the results of large scale molecular dynamics simulations aimed at understanding the origins of high friction coefficients in pure metals, and their concomitant reduction in alloys and composites. We utilize a series of targeted simulations to demonstrate that different slip mechanisms are active in the two systems, leading to differing frictional behavior. Specifically, we show that in pure metals, sliding occurs along the crystallographic slip planes, whereas in alloys shear is accommodated by grain boundaries. In pure metals, there is significant grain growth induced by the applied shear stress and the slip planes are commensurate contacts with high friction. However, the presence of dissimilar atoms in alloys suppresses grain growth and stabilizes grain boundaries, leading to low friction via grain boundary sliding.

Graphic Abstract



中文翻译:

金属合金中减少摩擦的原子起源

我们提出了大规模分子动力学模拟的结果,旨在了解纯金属中高摩擦系数的起因,以及随之而来的合金和复合材料的降低。我们利用一系列有针对性的模拟来证明两个系统中存在不同的滑动机制,从而导致不同的摩擦行为。具体而言,我们表明,在纯金属中,沿着晶体滑移面会发生滑动,而在合金中,剪切力是由晶界提供的。在纯金属中,由于施加的剪切应力而导致明显的晶粒长大,滑移面是具有高摩擦力的相应接触。但是,合金中异种原子的存在会抑制晶粒长大并稳定晶界,从而通过晶界滑动而导致低摩擦。

图形摘要

更新日期:2021-05-07
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