Abstract During reciprocating sliding of the Cu and Cu–Al alloys, we found that the characteristics of subsurface morphological patterns are intimately linked to dynamic recrystallization (DRX) structure generated by sliding. With the decreasing DRX grain size, the pattern changes from vortical to laminar feature at about 0.5 μm. The reciprocating sliding motion is favorable for producing morphologically vortical pattern and the DRX structure, while the occurrence of these processes is rare under unidirectional sliding. Additionally, the samples under unidirectional sliding exhibit higher wear resistance than those under reciprocating sliding, which may facilitate the development of delaminating tribolayer. The present results shed new insight into the relationship between morphological pattern, microstructure and wear behavior of materials under different sliding modes.

中文翻译：

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Cu和Cu-Al合金在单向和往复滑动作用下的亚表面形态、显微组织和磨损响应

摘要 在 Cu 和 Cu-Al 合金的往复滑动过程中，我们发现次表面形态模式的特征与滑动产生的动态再结晶 (DRX) 结构密切相关。随着 DRX 晶粒尺寸的减小，图案在约 0.5 μm 处从涡旋特征变为层流特征。往复滑动运动有利于产生形态涡旋图案和DRX结构，而这些过程在单向滑动下很少发生。此外，单向滑动下的样品比往复滑动下的样品具有更高的耐磨性，这可能有助于分层摩擦层的发展。目前的结果为形态模式之间的关系提供了新的见解，