Length effect of carbon nanotubes on the strengthening mechanisms in metal matrix composites
Length effect of carbon nanotubes on the strengthening mechanisms in metal matrix composites
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DOI：
10.1016/j.actamat.2017.08.048
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发表时间：
2017-11-01
期刊：
影响因子：
9.4
通讯作者：
Kondoh, K.
中科院分区：
文献类型：
--
作者：
Chen, B.;Shen, J.;Kondoh, K.
本文研究了碳纳米管长径比对铝基复合材料增强效果的影响。为此，通过三种不同的粉末冶金方法制备了用各种纵横比的CNT增强的Al样品。微观结构检测表明，碳纳米管均匀地分散在材料中的纵横比范围从6.5到55。拉伸结果表明，碳纳米管在复合材料中表现出很强的增强效果，无论其长径比。但加载后的检测和定量分析表明，碳纳米管的强化机制发生了转变，这与碳纳米管的长径比或长度密切相关。这种转变的起源进行了探讨，从位错的观点加载下的碳纳米管相互作用。这一发现为理解碳纳米管增强金属基复合材料的强化行为提供了新的思路。(C)2017 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
In the present work, we studied the effect of the aspect ratio of carbon nanotubes (CNTs) on strengthening aluminum metal matrix composites (Al MMCs). To this end, Al samples reinforced with CNTs of various aspect ratios were produced via three different powder metallurgy methods. Microstructural examination revealed that the CNTs were uniformly dispersed in the materials with a range of aspect ratios from 6.5 to 55. The tensile results showed that the CNTs exhibited a strong strengthening effect in the composites regardless of their aspect ratios. However, the post-loading examination and quantitative analysis indicated that there was a strengthening mechanism transition for CNTs, which was closely associated with the aspect ratio or length of CNTs. The origin of such transition was explored from the viewpoint of dislocation-CNTs interaction under loading. The findings may provide a new insight in understanding the strengthening behaviors of CNT-reinforced MMCs. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.