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Microstructural Characterization of Carbon Nanotubes (CNTs)-Reinforced Nickel Matrix Nanocomposites

Published online by Cambridge University Press:  24 September 2018

Sónia Simões Open the ORCID record for Sónia Simões [Opens in a new window] ,
Íris Carneiro ,
Filomena Viana ,
Marcos A. L. Reis  and
Manuel F. Vieira
Sónia Simões*
Affiliation:
CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal INEGI—Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
Íris Carneiro
Affiliation:
CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
Filomena Viana
Affiliation:
CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal INEGI—Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
Marcos A. L. Reis
Affiliation:
Faculdade de Ciências Exatas e Tecnologia, Universidade Federal do Pará, Abaetetuba, Pará 68440-000,Brazil
Manuel F. Vieira
Affiliation:
CEMMPRE, Department of Metallurgical and Materials Engineering, University of Porto, R. Dr. Roberto Frias, 4200-465 Porto, Portugal INEGI—Institute of Science and Innovation in Mechanical and Industrial Engineering, R. Dr. Roberto Frias, 4200-465 Porto, Portugal
*
Author for correspondence: Sónia Simões, E-mail: ssimoes@fe.up.pt
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Abstract

This research focuses on the microstructural characterization of nickel matrix composites reinforced by carbon nanotubes (CNTs). The nanocomposites were produced by a conventional powder metallurgy process and the dispersion of CNTs and mixture with nickel powders was performed in a single step by ultrasonication. Microstructural characterization of Ni–CNT nanocomposites was performed by scanning and transmission electron microscopy, electron backscattered diffraction, high-resolution transmission electron microscopy, selected area electron diffraction, and fast Fourier transform analyses. This characterization revealed CNTs embedded in the nickel grains and mainly presented as clusters at the grain boundaries. CNTs hinder recrystallization during sintering, and dislocation cells and subgrains form as a result of the recovery process.

Keywords

metal matrix compositescarbon nanotubeselectron microscopygrain boundarydislocation structure
Type
Material Sciences
Information
Microscopy and Microanalysis , Volume 25 , Issue 1 , February 2019 , pp. 180 - 186
Copyright
Copyright © Microscopy Society of America 2018 

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