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采用干滑动摩擦测试和微观刮痕测试研究流变铸造Al-16Si-4Cu-0.5Mg合金的干摩擦行为。通过光学显微镜、扫描电镜对合金显微组织、微观刮痕沟槽、宏观磨痕、磨面以及磨削进行观察分析。显微组织分析显示,经过流变处理,合金初生硅得到细化并更为圆整,共晶组织分布更为均匀,骨骼状的Al Fe Mn Si相得到破碎细化。微观刮痕测试显示,合金显微组织的细化提高了耐磨性能。干滑动摩擦测试表明,相比传统铸造,流变处理后合金耐磨性能得到明显的提高。微缓摩擦条件下,磨损以磨粒磨损为主。强摩擦条件下,表面氧化和粘着磨损为合金磨损失效机制。
The dry friction behavior of rheo-cast Al-16Si-4Cu-0.5Mg alloy was investigated by dry sliding friction test and micro-scratch test. The microstructure of the alloy, microscopic scratched groove, macroscopic wear scar, grinding face and grinding were observed by optical microscope and scanning electron microscope. Microstructure analysis showed that the primary Si of the alloy was refined and more rounded after the rheological treatment, the eutectic structure was more evenly distributed, and the bone-like Al Fe Mn Si phase was broken and refined. Micro-scratch test showed that the refinement of the alloy microstructure improves the wear resistance. Dry sliding friction test shows that compared with the traditional casting, the wear resistance of the alloy after rheological treatment is obviously improved. Micro-slow friction conditions, the wear to abrasive wear-based. Strong friction conditions, the surface oxidation and adhesive wear alloy wear failure mechanism.