Abstract

In this work, molecular dynamics simulations are performed to investigate the nanoscale wear behavior of SiC particle-reinforced aluminum matrix composites (SiC/Al NCs) through nanoscratching using a spherical diamond indenter. A series of simulations are conducted to explore the effects of scratching depth, scratching speed, temperature, indenter size, and particle size during the nanoscratching process. We find the dislocation strengthening in the nanoscratching of SiC/Al NCs. It is also found that the frictional force and normal force increase with the increase of scratching depth, indenter size, and nanoparticle size. Moreover, the friction coefficient increases with the scratching depth. However, the friction coefficient declines with the increase of indenter size and nanoparticle size. Furthermore, for a larger scratching speed, the frictional force becomes smaller, while the normal force becomes larger, which is mainly determined by the competition between strain rate hardening and thermal softening. We also find that both the frictional force and normal force become smaller for a higher temperature resulting from thermal softening effect. The insights into the nanoscale wear properties of SiC/Al NCs lay a foundation for the wide applications of SiC/Al NCs.

Graphical Abstract

中文翻译：

---

使用分子动力学模拟研究SiC / Al纳米复合材料的纳米级磨损

摘要

在这项工作中，进行了分子动力学模拟，以通过使用球形金刚石压头进行纳米划痕来研究SiC颗粒增强的铝基复合材料（SiC / Al NCs）的纳米级磨损行为。进行了一系列模拟，以探索纳米刮擦过程中刮擦深度，刮擦速度，温度，压头尺寸和颗粒尺寸的影响。我们发现在SiC / Al NCs的纳米划痕中位错强化。还发现摩擦力和法向力随着刮擦深度，压头尺寸和纳米颗粒尺寸的增加而增加。此外，摩擦系数随着刮擦深度的增加而增加。然而，随着压头尺寸和纳米颗粒尺寸的增加，摩擦系数下降。此外，为了提高刮擦速度，摩擦力变小，而法向力变大，这主要取决于应变速率硬化和热软化之间的竞争。我们还发现，由于热软化作用，在较高温度下，摩擦力和法向力都变小。对SiC / Al NCs的纳米级磨损性能的深入了解为SiC / Al NCs的广泛应用奠定了基础。

图形概要