The surface of Al–Si alloy samples was produced by chemical etching and laser finishing. After both chemical etching and laser finishing, the silicon particles could be exposed on the surface, resulting in improving the friction performance of Al–Si alloy. The edge shapes of the protruding silicon particles were different in the two surface treatments. Besides, the edges of protruding silicon particles were sharp after chemical etching. As a result, the edges were damaged in friction, and even some of silicon particle could shed. Then, it was easy for the abrasive wear to occur on the surface. There were obvious vortices on both sides of protruding silicon particle with sharp edge in the fluid region, resulting in a comparatively weak lubrication. In contrast, the edges of protruding silicon particles were round after laser finishing. Moreover, silicon particles could be closely combined with aluminum matrix due to the rapid cooling after being heated by laser, meanwhile, it was...

中文翻译：

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硅突起形状对铝硅合金摩擦性能的影响

Al-Si合金样品的表面通过化学蚀刻和激光精加工制成。经过化学蚀刻和激光抛光后，硅颗粒可能会暴露在表面上，从而改善了Al-Si合金的摩擦性能。在两种表面处理中，突出的硅颗粒的边缘形状不同。此外，经过化学蚀刻后，突出的硅颗粒的边缘变得锋利。结果，边缘由于摩擦而损坏，甚至一些硅颗粒也可能脱落。然后，很容易在表面上发生磨料磨损。在流体区域中，突出的硅颗粒的两边都有明显的涡旋，边缘很锋利，导致润滑性相对较弱。相反，在激光精加工之后，突出的硅颗粒的边缘是圆形的。此外，