铜镍合金滑动摩擦学行为的分子动力学模拟
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基于分子动力学模拟建立金刚石结构粗糙磨粒球与Ni60/10%Cu (C1)和Ni60/20%Cu (C2)铜镍合金滑动摩擦结构模型，通过探究铜镍合金在金刚石磨粒不同摩擦深度下滑动摩擦行为，结合合金的磨损形貌、磨损原子数目及分布、摩擦力和亚表面损伤对合金纳米尺度下磨损机理进行了研究. 结果表明：在摩擦过程中，合金磨损原子首先堆积在磨粒前方，随着滑动摩擦的进行，当压入深度为10 Å时，磨损原子与磨粒之间黏附力较小，磨损原子流向磨痕两侧，当压入深度为20 Å时，磨损原子数量增加，增加的磨损原子主要堆积在磨粒前方，共同对合金进行磨损. 随压入深度的增加，合金在摩擦过程中的位错密度上升，合金亚表面损伤程度提高，但在相同压入深度下，C2合金平均位错密度大于C1合金，C1合金的亚表面质量优于C2合金，这表明摩擦深度是影响合金亚表面质量的重要因素，且Cu原子数目增加会提高合金在纳米尺度下摩擦过程中亚表面损伤.
A molecular dynamics simulation was employed to establish sliding friction structural models of diamond-structured rough abrasive spheres paired with Ni60/10%Cu (C1) and Ni60/20%Cu (C2) Cu-Ni alloys. The sliding friction behaviors of the Cu-Ni alloys under different friction depths of diamond abrasives were investigated, and the nanoscale wear mechanisms of the alloys were analyzed by combining the wear morphology, number and distribution of worn atoms, friction force, and subsurface damage of the alloys. The results show that during the friction process, worn atoms of the alloys first accumulate in front of the abrasive. As the sliding friction proceeds, when the indentation depth is 10 Å, the adhesion between the worn atoms and the abrasive is weak, and the worn atoms flow to both sides of the wear scar. When the indentation depth is 20 Å, the number of worn atoms increases, and the newly added worn atoms mainly accumulate in front of the abrasive, jointly causing wear to the alloy. With the increase of indentation depth, the dislocation density of the alloy during friction rises, and the degree of subsurface damage of the alloy increases. However, under the same indentation depth, the average dislocation density of the C2 alloy is higher than that of the C1 alloy, and the subsurface quality of the C1 alloy is better than that of the C2 alloy. This indicates that the friction depth is an important factor affecting the subsurface quality of the alloy, and increasing the number of Cu atoms will exacerbate the subsurface damage of the alloy during nanoscale friction processes.
