Analysis of carbon nanotube shortening and composite strengthening in carbon nanotube/aluminum composites fabricated by multi-pass friction stir processing
Analysis of carbon nanotube shortening and composite strengthening in carbon nanotube/aluminum composites fabricated by multi-pass friction stir processing
复制标题
多道搅拌摩擦加工制备碳纳米管/铝复合材料中碳纳米管缩短和复合强化的分析
DOI：
10.1016/j.carbon.2013.12.025
复制
发表时间：
2014-04-01
期刊：
影响因子：
10.9
通讯作者：
Ma, Z. Y.
中科院分区：
文献类型：
--
作者：
Liu, Z. Y.;Xiao, B. L.;Ma, Z. Y.
将碳纳米管（CNTs）通过多道次摩擦搅拌处理（FSP）分散到Al基体中以制备4.5体积%的碳纳米管。CNT/2009 A1复合材料。复合材料的最大强度是通过三道次FSP获得的，并且归因于CNT簇减少、晶粒细化和CNT缩短的综合效应。提出了一个碳纳米管缩短模型来描述碳纳米管长度随FSP道次的变化。该模型表明，碳纳米管长度的倒数与机械效应的持续时间呈线性关系，这是由我们和其他研究人员的各种机械过程的实验结果验证。基于碳纳米管在铝基体中的载荷传递效率的概念，提出了一个考虑碳纳米管长径比、晶粒尺寸、碳纳米管团簇和孔隙浓度等微观结构参数的通用强度模型，用于预测碳纳米管团簇对碳纳米管/2009 Al复合材料的强化作用。预测结果与实验结果吻合较好。(C)2013爱思唯尔有限公司保留所有权利。
Carbon nanotubes (CNTs) were dispersed into Al matrix by multi-pass friction stir processing (FSP) to fabricate 4.5 vol.% CNT/2009A1 composites. The maximum strength of the composites was obtained with three-pass FSP and was attributed to the combined effect of CNT cluster reduction, grain refinement, and CNT shortening. A CNT shortening model is proposed to describe the CNT length change with FSP passes. The model indicates that the reciprocal of the CNT length has a linear relationship with the duration of the mechanical effect, which was verified by our and other investigators' experimental results on various mechanical processes. Based on the concept of the load transfer efficiency of CNTs in the Al matrix, a universal strength model considering the microstructural parameters the aspect ratio of CNTs, grain size, and concentration of CNT clusters and pores - is proposed to predict the strengthening of the CNT/2009A1 composites with and without CNT clusters. The predictions are in good agreement with the experimental results. (C) 2013 Elsevier Ltd. All rights reserved.