Dual strengthening mechanisms induced by carbon nanotubes in roll bonded aluminum composites

被引：91

作者：

Lahiri, D. ^{[1
]}

Bakshi, S. R. ^{[1
]}

Keshri, A. K. ^{[1
]}

Liu, Y. ^{[2
]}

Agarwal, Arvind ^{[1
]}

机构：

[1] Florida Int Univ, Nanomech & Nanotribol Lab, Miami, FL 33174 USA

[2] Florida Int Univ, Adv Mat Engn Res Inst, Miami, FL 33174 USA

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 523卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

Al-CNT composite foil; Roll-bonding; Dislocation density; Strain hardening; Dispersion; X-RAY-DIFFRACTION; VOIGT-FUNCTION; ALLOY;

D O I：

10.1016/j.msea.2009.06.006

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The dual role of carbon nanotubes (CNTs) in strengthening roll bonded aluminum composites has been elucidated in this study. An increase in the elastic modulus by 59% has been observed at 2 vol.% CNT addition in aluminum, whereas tensile strength increases by 250% with 9.5 vol.% CNT addition. CNTs play a dual role in the strengthening mechanism in Al-CNT composite foil, which can be correlated to the degree of dispersion of CNTs in the matrix. Better CNT dispersion leads to improvement of elastic properties. In contrast, CNT clusters in the aluminum matrix impede dislocation motion, causing strain hardening and thus improvement in the tensile strength. Dislocation density of the composites has been computed as a function of CNT content to show the effect on strain hardening of the metal matrix-CNT composite. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：263 / 270

页数：8

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