Length effect of carbon nanotubes on the strengthening mechanisms in metal matrix composites

被引：379

作者：

Chen, B. ^{[1
]}

Shen, J. ^{[1
]}

Ye, X. ^{[1
]}

Jia, L. ^{[2
]}

Li, S. ^{[2
]}

Umeda, J. ^{[1
]}

Takahashi, M. ^{[1
]}

Kondoh, K. ^{[1
]}

机构：

[1] Osaka Univ, Joining & Welding Res Inst, 11-1 Mihogaoka, Osaka 5670047, Japan

[2] Xian Univ Technol, Sch Mat Sci & Engn, Xian 710048, Shaanxi, Peoples R China

来源：

ACTA MATERIALIA | 2017年 / 140卷

关键词：

Metal matrix composites (MMCs); Carbon nanotubes (CNTs); Strengthening mechanisms; Orowan mechanism; Load transfer; Length effect; LOAD-TRANSFER; INTERFACIAL REACTION; POWDER-METALLURGY; MILLING TIME; DISPERSION; MODEL; MICROSTRUCTURES; HARDNESS;

D O I：

10.1016/j.actamat.2017.08.048

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页码：317 / 325

页数：9

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