Title

Synthesis, characterisation and mechanical properties of SiC reinforced Al based nanocomposites processed by MA and SPS

Authors

Authors

N. Al-Aqeeli; K. Abdullahi; A. S. Hakeem; C. Suryanarayana; T. Laoui;S. Nouari

Comments

Authors: contact us about adding a copy of your work at STARS@ucf.edu

Abbreviated Journal Title

Powder Metall.

Keywords

Aluminium alloys; Silicon carbide; Mechanical alloying; Spark plasma; sintering; Microstructure; Hardness; STRUCTURAL EVOLUTION; MATRIX COMPOSITES; PARTICLES; POWDERS; ALLOYS; Metallurgy & Metallurgical Engineering

Abstract

Al based alloys reinforced with different amounts (5, 12 and 20 wt-%) of nanosized SiC particulates were synthesised by mechanical alloying and consolidated by the spark plasma sintering (SPS) technique. The distribution of the reinforcement phase in the composite was evaluated as a function of the milling time and the amount of SiC. The processed materials were characterised by scanning electron microscopy and energy dispersive spectroscopy for the morphology and composition and X-ray diffraction. Continuous reduction in crystallite size was observed as milling progressed and after milling for 20 h the resulting powders reached a grain size of <100 nm. These Al-SiC composites were successfully consolidated by the SPS method at different sintering temperatures of 400, 450 and 500 degrees C. It is suggested that a higher hardness can be achieved even at 20 wt-% SiC when a higher sintering temperature, for example, above 500 degrees C, is used.

Journal Title

Powder Metallurgy

Volume

56

Issue/Number

2

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

149

Last Page

157

WOS Identifier

WOS:000318021100024

ISSN

0032-5899

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