Effect of load on the friction and wear properties of bulk nanocrystalline Fe-Al-Cr alloy

Large dimensional bulk nanocrystalline Fe-Al-Cr alloy with 10 wt.% Cr were produced by self-propagating combustion synthesis. The effect of load on the friction and wear properties of alloys was researched by M-2000 wear tester and the worn surface was analysed by SEM. The results show that with the increase of the loads, the friction coefficient generally decreases. The wear rate decreases at first and then increases, and the friction coefficient and the wear rate reached the lowest level when the load was 140 N. With the increase of the load, the worn mechanism of the nanocrystalline Fe-Al-Cr alloy transformed from the abrasive wear and delamination wear to the adhesive wear and abrasive wear. The stable and compact third body formed at the load of 140N received the best wear resistance and antifriction.采用自蔓延燃烧合成法制备了含10%质量分数铬的大尺寸块体纳米晶Fe-Al-Cr合金。采用M-2000型磨损试验机研究了载荷对该合金摩擦磨损性能的影响，并通过扫描电子显微镜（SEM）分析了磨损表面。研究结果表明，随着载荷的增大，合金的摩擦系数整体呈下降趋势；磨损率先降低后升高，当载荷为140 N时，摩擦系数与磨损率均达到最低值。随着载荷的升高，该纳米晶Fe-Al-Cr合金的磨损机制从磨粒磨损与剥层磨损转变为黏着磨损与磨粒磨损。当载荷为140 N时，形成的稳定致密的摩擦第三体具备最优的耐磨减摩性能。