Carbon nanotube reinforced aluminum composite fabricated by semi-solid powder processing
Carbon nanotube reinforced aluminum composite fabricated by semi-solid powder processing
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DOI：
10.1016/j.jmatprotec.2011.03.007
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发表时间：
2011-08
影响因子：
6.3
通讯作者：
Yufeng Wu;G. Kim
中科院分区：
文献类型：
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作者：
Yufeng Wu;G. Kim
半固态粉末成形技术是一种集半固态成形和粉末冶金优点于一体的新型成形技术。本文首次采用固相聚合法制备了碳纳米管（CNT）增强铝合金6061（Al 6061）复合材料。采用机械合金化方法将碳纳米管分散在基体相中。研究了加工温度（600 °C、620 °C和640 °C）对Al 6061-CNT复合材料显微组织、硬度、断口形貌和成分的影响。总的来说，在半固体状态下，在100 MPa的预压和50 MPa的固结压力下，Al 6061-CNT复合材料显示出99%以上的完全致密化。微观结构和断口分析表明，碳纳米管均匀地分散在整个Al 6061基体。在较高的液体含量下获得较高的密度的复合材料，尽管在620 °C下加工时获得最高的复合材料硬度。据推测，在较高温度下碳化物的形成影响基体和CNT之间的界面结合。研究结果表明，用等离子体等离子体制备碳纳米管增强金属复合材料是可行的。
Semi-solid powder processing (SPP) is a promising technology that combines the benefits of semi-solid forming and powder metallurgy. In this study, carbon nanotube (CNT) reinforced aluminum alloy 6061 (Al6061) composite was synthesized by SPP for the first time. Mechanical alloying was used to disperse the CNTs in the matrix phase. The effects of the processing temperature (600 °C, 620 °C and 640 °C) on the microstructure, hardness, fracture surface and composition of the Al6061–CNT composite were investigated. Overall, the Al6061–CNT composite showed full densification above 99% with 100 MPa of pre-compaction and 50 MPa of pressure during consolidation in the semi-solid regime. Microstructure and the fracture surface analyses showed that the CNTs were uniformly dispersed throughout the Al6061 matrix. Higher density composite was obtained at higher liquid content, although the highest composite hardness was achieved when processed at 620 °C. It was speculated that the formation of carbides at higher temperatures affected the interface bonding between the matrix and CNT. The study showed feasibility of manufacturing CNT reinforced metal composites by SPP.