Strengthening mechanisms in carbon nanotube-reinforced aluminum composites
Strengthening mechanisms in carbon nanotube-reinforced aluminum composites
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DOI：
10.1016/j.carbon.2015.08.112
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发表时间：
2015-12-01
期刊：
影响因子：
10.9
通讯作者：
Lee, Young Hee
中科院分区：
文献类型：
--
作者：
Park, Jong Gil;Keum, Dong Hoon;Lee, Young Hee
虽然碳纳米管（CNTs）被用于增强铝合金，但其潜在的强化机制尚未阐明。在这里，我们专注于阐明这些机制中的几个，包括负载转移，产生的热失配位错，和Orowan循环系统来解释增强的CNT增强Al的机械性能。样品制备过程涉及机械粉碎铝在石蜡油中混合分散在二氯乙烷中的CNT。然后将混合物烧结并熔融共混以产生固体样品。通过X射线衍射、拉曼光谱和透射电子显微镜测量证实了Al和CNT壁之间形成共价键（Al4C3）。添加0.2wt%碳纳米管后，复合材料的屈服强度和拉伸强度分别提高了60%和23%。这些增强证实以及从多个强化机制的预测值。(C)2015爱思唯尔有限公司版权所有。
Although carbon nanotubes (CNTs) are used to reinforce aluminum alloys, the underlying strengthening mechanisms have not yet been clarified. Here, we focus on elucidating several of these mechanisms including load transfer, generation of dislocations from thermal mismatch, and the Orowan looping system to explain the enhanced mechanical properties of CNT-reinforced Al. The sample preparation procedure involves mechanically pulverizing Al in paraffin oil mixed with CNTs dispersed in dichloroethane. The mixture was then sintered and melt-blended to produce solid samples. The formation of covalent bonds (Al4C3) between Al and CNT walls was confirmed by X-ray diffraction, Raman spectroscopy, and transmission electron microscope measurements. The yield strength and tensile strength were improved by 60% and 23%, respectively, with the addition of 0.2 wt% CNTs. These enhancements corroborate well with the predicted values from the multiple strengthening mechanisms. (C) 2015 Elsevier Ltd. All rights reserved.