The aim of the present work is to investigate vickers hardness, wear behavior as well as to perform optimization of wear data for pure Al and Al-Al2O3-TiO2 hybrid metal matrix composites. The hybrid composite (Al-Al2O3-TiO2) was prepared by mechanical stir casting with equal proportion of reinforcement (2.5, 5.0, 7.5 and 10 wt.%). Vickers hardness, wear behavior and its optimization using ANOVA as well as TOPSIS along with the microstructure of the worn surface of prepared sample has been investigated. Vickers hardness increases with an increase in weight percentage of reinforcements. Wear test was carried out under dry sliding condition by pin-on-disc wear machine according to the ASTM G99-95a standard. Wear properties of the sample have been obtained at different percentages of reinforcement. Wear resistance of the hybrid composite increases with the variation of percentage of titanium oxide particles due to its lubricating properties. ANOVA shows that the reinforcements and load have different effect on samples wear rate. TOPSIS analysis shows rank of the sample according to its wear rate. Worn surface morphology was investigated and it showed deep grooves, more debris, delamination and rough surface in pure Al sample as compared to the high percentage of reinforced hybrid metal matrix composites.

中文翻译：

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Al-Al2O3-TiO2混合金属基复合材料的磨损、优化和表面分析

本工作的目的是研究维氏硬度、磨损行为以及对纯 Al 和 Al-Al2O3-TiO2 混合金属基复合材料的磨损数据进行优化。混合复合材料 (Al-Al2O3-TiO2) 是通过机械搅拌浇铸制备的，具有等比例的增强材料 (2.5、5.0、7.5 和 10 wt.%)。维氏硬度、磨损行为及其使用方差分析和 TOPSIS 的优化以及制备的样品磨损表面的微观结构进行了研究。维氏硬度随着增强材料重量百分比的增加而增加。根据ASTM G99-95a标准，采用销盘式磨损机在干滑动条件下进行磨损试验。样品的磨损性能是在不同的增强百分比下获得的。由于其润滑性能，混合复合材料的耐磨性随着氧化钛颗粒百分比的变化而增加。方差分析表明，增强材料和载荷对样品磨损率有不同的影响。TOPSIS 分析根据其磨损率显示样品的等级。研究了磨损的表面形态，与高百分比的增强混合金属基复合材料相比，纯铝样品显示出深凹槽、更多碎屑、分层和粗糙表面。