Microstructure and dry sliding wear behavior of cast Al–Mg2Si in-situ metal matrix composite modified by Nd
Microstructure and dry sliding wear behavior of cast Al–Mg2Si in-situ metal matrix composite modified by Nd
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DOI：
10.1007/s12598-013-0030-4
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发表时间：
2013-04
期刊：
影响因子：
8.8
通讯作者：
Xiao-feng Wu;Guan-Gan Zhang;Fu-Fa Wu
中科院分区：
文献类型：
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作者：
Xiao-feng Wu;Guan-Gan Zhang;Fu-Fa Wu
研究了Nd变质铸造Al-18wt%Mg2Si自生金属基复合材料的显微组织和干滑动磨损性能。实验结果表明，在Al-18wt%Mg_2Si复合材料中引入适量的Nd后，初生Mg_2Si和共晶Mg_2Si均得到了较好的变质。初生Mg 2Si的形貌由不规则或树枝状转变为多面体状，平均粒径明显减小。此外，共晶Mg 2Si相的形态从片状变为非常短的纤维状或点状。添加Nd的复合材料的磨损率和摩擦系数低于不添加Nd的复合材料。此外，添加0.5wt%Nd的复合材料的磨损机制从组合的磨料，粘合剂，和分层磨损没有Nd到一个单一的温和的磨料磨损与0.5wt%Nd。
AbstractThe microstructure and dry sliding wear behavior of cast Al–18 wt% Mg2Si 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 Mg2Si in the Al–18 wt% Mg2Si composite are well modified. The morphology of primary Mg2Si is changed from irregular or dendritic to polyhedral shape, and its average particle size is significantly decreased. Moreover, the morphology of the eutectic Mg2Si 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.