搅拌摩擦加工SiP/ZA40原位复合材料的摩擦学行为

来源期刊:中国有色金属学报(英文版)2020年第11期

论文作者:F. RAJABI R. TAGHIABADI M. H. SHAERI

文章页码:3043 - 3057

关键词:Zn-40Al-2Cu合金;硅;复合材料;摩擦学;搅拌摩擦加工

Key words:Zn-40Al-2Cu alloy; silicon; composite; tribology; friction stir processing

摘    要:研究不同搅拌摩擦加工(FSP)工艺参数如转速(400,630,800和1000 r/min)和移动速度(25和50 mm/min)对 Si 颗粒增强Zn-40Al-2Cu基原位复合材料摩擦性能的影响。经过初步优化,选择800 r/min和25 mm/min作为最佳FSP参数。结果表明,采用多道次FSP能改善材料的摩擦性能。例如,在0.75 MPa载荷下,经四道次FSP的复合材料磨损率和平均摩擦因数(COF)分别比未加工的复合材料降低53% 和50%。磨损表面和磨屑的扫描电 镜结果显示,显微组织相尤其是粗硅颗粒的密集细化和均匀分布、硅颗粒间距的减小和铸造缺陷的消除是提高基体抗滑移变形能力的重要因素。这些因素促使形成稳定的摩擦层,从而改善材料的摩擦性能。

Abstract: The effect of friction stir processing (FSP) at different rotation speeds (400, 630, 800, and 1000 r/min) and traverse speeds (25 and 50 mm/min) on the tribological properties of a Si particle reinforced Zn-40Al-2Cu-based in-situ composite was investigated. After preliminary optimization, 800 r/min and 25 mm/min were selected as optimum FSP parameters. According to the results, multi-pass FSP improved the tribological properties. For instance, at an applied pressure of 0.75 MPa, the wear rate and average coefficient of friction (COF) of four-pass FSPed composite were lower than those of base composite by 53% and 50%, respectively. SEM examinations of worn surfaces, wear debris, and worn subsurfaces revealed that the intensive refinement and uniform distribution of microstructural phases, especially the coarse Si particles, reduced Si particles interspacing, and elimination of casting defects were the most important factors enhancing the substrate resistance against sliding-induced deformation. This led to the formation of stable tribolayers that improved the tribological properties.

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