行进速度对搅拌摩擦加工高熵合金增强铝基复合材料组织与性能的影响

Effect of Traverse Speed on Microstructure and Properties of High-Entropy Alloy Reinforced Aluminum Matrix Composite by Friction Stir Processing

采用搅拌摩擦加工技术制备了FeCoNiCrAl高熵合金颗粒增强AA5083铝基复合材料,研究了行进速度(45,60,75 mm·min^(-1))对复合材料中高熵合金颗粒分布、显微硬度和耐磨性能的影响。结果表明:制备的复合材料中没有新相生成,复合材料的显微硬度高于铝合金基体的;随着行进速度的增加,高熵合金颗粒的分布均匀性变差,复合材料的显微硬度略微降低;复合材料的平均摩擦因数和磨损率均较铝合金基体的低;随着行进速度的增加,复合材料摩擦因数和磨损率均增大,耐磨性能下降;复合材料和铝合金的磨损机制分别为磨粒磨损和黏着磨损。

AA5083 aluminum matrix composite reinforced by FeCoNiCrAl high-entropy alloy particles were prepared by friction stir processing.The effect of the traverse speeds(45,60,75 mm·min^(-1))on the high-entropy alloy particle distribution,microhardness and wear resistance of the composite was studied.The results show that no new phases were formed in the prepared composite.The microhardness of the composite was higher than that of the aluminum alloy matrix.With the increase of the traverse speed,the distribution uniformity of the high-entropy alloy particles became worse and the microhardness of the composite decreased slightly.The average friction coefficient and wear rate of the composite were lower than those of the aluminum alloy matrix.With the increase of the traverse speed,the friction coefficient and wear rate of the composite increased,and the wear resistance decreased.The wear mechanisms of the composite and aluminum alloy were abrasive wear and adhesive wear,respectively.