Microstructure and dry sliding wear behavior of cast Al–Mg 2 Si in‐situ metal matrix composite modified by Nd

作者：Xiaofeng Wu, Guangan Zhang, Fufa Wu · 发表于：Rare Metals · 年份：2013 · DOI：10.1007/s12598-013-0030-4 · 被引用次数：48 · 研究领域：Aluminum Alloys Composites Properties、Aluminum Alloy Microstructure Properties、Magnesium Alloys: Properties and Applications

Abstract The microstructure and dry sliding wear behavior of cast Al–18 wt% Mg 2 Si in‐situ metal matrix composite modified by Nd were investigated. Experimental results show that, after introducing a proper amount of Nd, both primary and eutectic Mg 2 Si in the Al–18 wt% Mg 2 Si composite are well modified. The morphology of primary Mg 2 Si is changed from irregular or dendritic to polyhedral shape, and its average particle size is significantly decreased. Moreover, the morphology of the eutectic Mg 2 Si phase is altered from flake‐like to very short fibrous or dot‐like. The wear rates and friction coefficient of the composites with Nd are lower than those without Nd. Furthermore, the addition of 0.5 wt% Nd changes the wear mechanism of the composite from the combination of abrasive, adhesive, and delamination wear without Nd into a single mild abrasion wear with 0.5 wt% Nd.