Effect of carbon nanotube damage on the mechanical properties of aluminium-carbon nanotube composites
Effect of carbon nanotube damage on the mechanical properties of aluminium-carbon nanotube composites
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DOI：
10.1016/j.jallcom.2014.03.174
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发表时间：
2014-09-15
影响因子：
6.2
通讯作者：
Metwalli, Sayed
中科院分区：
文献类型：
--
作者：
Hassan, Mohamed T. Z.;Esawi, Amal M. K.;Metwalli, Sayed
利用中、重度损伤的碳纳米管研究了碳纳米管损伤对铝/碳纳米管复合材料力学性能的影响。结果表明，与纯Al相比，碳纳米管损伤轻微的复合材料的强度提高了97.5%，弹性模量提高了14.2%。观察到碳化物的形成增加--由于所遭受的损害--并被认为是以孤立的二次粒子的形式存在于基质中，这对增强Al-CNT键没有贡献。碳纳米管损伤严重的复合材料的强度和弹性模量分别比纯Al高71%和3.3%，表明即使是碎裂的碳纳米管颗粒也有助于提高铝基体的强度和弹性系数。根据Al-CNT复合材料中不同的强化机制，对结果进行了分析。强度的提高被认为主要是由于基质的增强机制，不受碳纳米管损伤的影响，而杨氏模量的增加是由于载荷转移到碳纳米管上，因此，对于轻度损伤的碳纳米管，其管状结构和高深宽比的情况下更加显着。(C)2014爱思唯尔B.V.保留所有权利。
The effect of carbon nanotube (CNT) damage on the mechanical properties of aluminium (Al)-CNT composites is investigated using mildly and severely damaged CNTs. Composites prepared with mildly damaged CNTs are found to have 97.5% higher strength and 14.2% higher modulus than pure Al. Increased carbide formation - due to the damage sustained - is observed and is believed to be in the form of isolated secondary particles within the matrix which do not contribute to enhancing the Al-CNT bonds. The strength and modulus of composites with severely damaged CNTs are found to be higher by 71% and 3.3% than pure Al, suggesting that even fragmented CNT particles can contribute to enhancing the strength and modulus of the Al matrix. The results are analyzed in light of strengthening mechanisms expected to be playing different roles in Al-CNT composites. The enhancement in strength is believed to be mainly due to matrix strengthening mechanisms and is not affected by CNT damage whereas the gain in Young's modulus is due to load transfer to the CNTs and accordingly is more significant in the case of the mildly damaged CNTs which have retained their tubular structure and high aspect ratio. (C) 2014 Elsevier B.V. All rights reserved.