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Stir casting process for manufacture of Al–SiC composites
Soltani, S.; Azari Khosroshahi, Rasoul; Brabazon, Dermot
Stir casting is an economical process for the fabrication of aluminum matrix composites. There are many parameters in this process, which affect the final microstructure and mechanical properties of the composites. In this study, micron-sized SiC particles were used as reinforcement to fabricate Al-3 wt% SiC composites at two casting temperatures (680 and 850 C) and stirring periods (2 and 6 min). Factors of reaction at matrix/ceramic interface, porosity, ceramic incorporation, and agglomeration of the particles were evaluated by scanning electron microscope (SEM) and high-resolution transition electron microscope (HRTEM) studies. From microstructural characterizations, it is concluded that the shorter stirring period is required for ceramic incorporation to achieve metal/ceramic bonding at the interface. The higher stirring temperature (850 C) also leads to improved ceramic incorporation. In some cases, shrinkage porosity and intensive formation of Al4C3 at the metal/ceramic interface are also observed. Finally, the mechanical properties of the composites were evaluated, and their relation with the corresponding microstructure and processing parameters of the composites was discussed.
Keyword(s): Materials; Mechanical engineering; Aluminum matrix composite; Microstructure; Mechanical properties; Stir casting
Publication Date:
2015
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: Dublin City University
Citation(s): Soltani, S. and Azari Khosroshahi, Rasoul and Brabazon, Dermot (2015) Stir casting process for manufacture of Al–SiC composites. Rare Metals . ISSN 1001-0521
Publisher(s): Maney Publishing (Springer)
File Format(s): application/pdf
Related Link(s): http://doras.dcu.ie/21108/1/Paper_24_ISI.pdf
First Indexed: 2016-03-01 05:29:10 Last Updated: 2018-07-11 06:07:22