Enhanced yield strength in iron nanocomposite with in situ grown single-wall carbon nanotubes

Document Type

Article

Publication Date

2-1-2006

Abstract

The yield strength of iron-carbon nanotube composites fabricated by in situ chemical vapor deposition of 2.2 vol% single-wall carbon nanotubes (SWNTs) inside an iron matrix showed substantial enhancement up to 45%, relative to that of similarly treated pure iron samples without carbon nanotubes of the same piece density. The work hardening coefficient and the Vickers hardness coefficient also significantly increased in these composites relative to the reference samples. X-ray diffraction together with energy dispersive x-ray measurements and micro-Raman spectroscopy indicated no concomitant formation of carbides and very little amorphous carbon during the vapor deposition process. Micro-Raman spectroscopy and scanning and transmission electron microscopy showed spectral signatures and images, respectively, indicating the formation and dispersion of SWNTs within the cavities of the iron matrix. It is suggested that the increased strength of the nanocomposites was due to the mechanical support provided to these cavities by the extremely strong SWNTs. © 2006 Materials Research Society.

Identifier

33644526901 (Scopus)

Publication Title

Journal of Materials Research

External Full Text Location

https://doi.org/10.1557/jmr.2006.0061

ISSN

08842914

First Page

522

Last Page

528

Issue

2

Volume

21

Fund Ref

Armament Research, Development and Engineering Center

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