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Title: Strengthening Mechanisms of Aluminum Matrix Nanocomposites Reinforced with CNTs Produced by Powder Metallurgy
Authors: Carneiro, Íris
Fernandes, José Valdemar 
Simões, Sónia
Keywords: strengthening mechanisms; metal matrix nanocomposites; powder metallurgy; load transfer; second-phase particles; strain hardening
Issue Date: 2021
Project: FCT Ph.D. grant PD/BD/143030/2018 
P2020|Norte2020 program with the reference NORTE-08-5369-FSE-000051 
FEDER funds through the program COMPETE —Programa Operacional Factores de Competitividade 
FCT UIDB/EMS/00285/2020 
Serial title, monograph or event: Metals
Volume: 11
Issue: 11
Abstract: The present work aims to investigate the strengthening mechanisms in aluminum matrix nanocomposites reinforced by carbon nanotubes (CNTs). A classical powder metallurgy route produced Al-CNT nanocomposites using ultrasonication and ball milling as dispersion/mixture techniques. The microstructural characterization is crucial for this study to reach the objective, being performed mainly by electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). Uniform dispersion without damaging the CNTs structure is the key for the nanocomposite by powder metallurgy production process. The reinforcement effect occurs due to several strengthening mechanisms that act simultaneously. For the Al-CNT nanocomposites produced by ultrasonication as a dispersion/mixture technique, the observed improvement in the mechanical properties of nanocomposites can be attributed to the load transfer from the matrix to the CNTs. The strain hardening and the second-phase hardening can also have a small contribution to the strengthening of the nanocomposites.
ISSN: 2075-4701
DOI: 10.3390/met11111711
Rights: openAccess
Appears in Collections:I&D CEMMPRE - Artigos em Revistas Internacionais

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