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Microstructure and mechanical properties of friction stir welded AA6092/SiC metal matrix composite

Salih, Omar S.; Ou, Hengan; Wei, Xingguo; Sun, W.

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Authors

Omar S. Salih

HENGAN OU H.OU@NOTTINGHAM.AC.UK
Associate Professor

Xingguo Wei

W. Sun



Abstract

There is a need for improved understanding on the effects of friction stir welding (FSW) on the metallurgical and mechanical properties of aluminium matrix composite (AMC). In this study, AA6092/SiC/17.5p-T6 AMC joints were produced by using FSW with varying tool rotation and traverse speeds. The microstructural characterisation by scanning electron microscopy equipped with electron backscattered diffraction (EBSD) system revealed a substantial grain refinement and a homogeneous distribution of reinforcement particles in the nugget zone. The grain size of the nugget zone was greatly influenced by weld pitch, as a key indicator to control the amount of heat input, exposure time and cooling rate. Vickers microhardness profile across the welding zone revealed a significant difference in microhardness among the base metals, heat affected zone, thermo-mechanically affected zone and nugget zone. The tensile strength of the cross-weld specimens showed a high joint efficiency of about 75% of the base metal combined with relatively high ductility. Low-cycle fatigue properties were investigated in the axial total strain-amplitude control mode (from 0.3% to 0.5%) with

Journal Article Type Article
Acceptance Date Oct 28, 2018
Online Publication Date Nov 1, 2018
Publication Date Jan 10, 2019
Deposit Date Nov 8, 2018
Publicly Available Date Nov 2, 2019
Journal Materials Science and Engineering: A
Print ISSN 0921-5093
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 742
Pages 78-88
DOI https://doi.org/10.1016/j.msea.2018.10.116
Public URL https://nottingham-repository.worktribe.com/output/1235712
Publisher URL https://www.sciencedirect.com/science/article/pii/S0921509318315077
Additional Information This article is maintained by: Elsevier; Article Title: Microstructure and mechanical properties of friction stir welded AA6092/SiC metal matrix composite; Journal Title: Materials Science and Engineering: A; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.msea.2018.10.116; Content Type: article; Copyright: © 2018 The Authors. Published by Elsevier B.V.

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