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

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

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

Citation

Salih, O. S., Ou, H., Wei, X., & Sun, W. (2019). Microstructure and mechanical properties of friction stir welded AA6092/SiC metal matrix composite. Materials Science and Engineering: A, 742, 78-88. https://doi.org/10.1016/j.msea.2018.10.116

• 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.