( 1. 華南理工大學(xué) 機械工程學(xué)院，廣州 510641;
2. 河南科技學(xué)院 機電學(xué)院， 新鄉(xiāng) 453003)
摘 要: 用擠壓鑄造法制備Al2O3短纖維石墨顆粒混雜增強ZL109復(fù)合材料， 并研究富Ce混合稀土對該混雜復(fù)合材料耐磨性能的影響。 結(jié)果表明： 適量稀土元素可在一定程度上改善該混雜復(fù)合材料的耐磨性能， 特別在低載荷下， 其作用更為顯著； 稀土對復(fù)合材料磨損機制的影響與載荷有關(guān)， 在較低的載荷下， 犁溝磨損是復(fù)合材料的主要磨損機制， 并存在輕微的剝層破壞； 但在較大載荷下， 稀土元素加入后， 特別是稀土含量高于0.6％后， 復(fù)合材料的磨損機制由犁溝磨損轉(zhuǎn)變?yōu)閲乐氐膭兟淠p， 復(fù)合材料耐磨性反而降低， 這可能與稀土含量高時富含稀土的針狀相析出有關(guān)。
關(guān)鍵字: 稀土； 金屬基復(fù)合材料； 耐磨性能
（ 1. School of Mechanical Engineering, South China University of Technology, Guangzhou 510641, China;
2. Mechanical and Electrical Department, Henan Institute of Science and Technology, Xinxiang 453003, China）
Abstract: The ZL109 aluminum-alloy-based hybrid composites reinforced with 8% alumina short fibre and 10% graphite particle (volume fraction) were fabricated by squeeze-casting process. The effect of rare earth enriched with Ce on wear resistance of the hybrid composites was investigated. The results show that the addition of RE elements can improve the wear resistance of the hybrid composites and there exists better effect at low load specially. The optimum range of RE content is 0.3%-0.6%(mass fraction). The effects of RE on wear mechanisms of the hybrid composites relate closely with the applied load. The ploughing wear is the dominant wear mechanisms of the hybrid composites at low load and there exists slight delamination. However, the dominant wear mechanisms shift to severe delamination when the RE content exceeds 0.6% at high load, and the wear resistance of the hybrid composites decrease, which relates to the precipitation of needle-shaped phase enriched RE elements during heat-treating of the composites with high RE content.
Key words: rare earth; metal matrix composites; wear resistance
