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A new semi-solid casting technique for fabricating SiC-reinforced Mg alloys matrix composites
Chalmers University of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
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2016 (English)In: Composites Part B: Engineering, ISSN 1359-8368, E-ISSN 1879-1069, Vol. 94, p. 176-189Article in journal (Refereed) Published
Abstract [en]

The capability of the newly developed rheocasting (RC) technique in combination with the RheoMetal process for producing SiC particulate-reinforced AM50 and AZ91D matrix composites (Mg-based MMCs) was investigated. The quality of the MMCs was studied by analyzing the fraction of casting pores, number density of SiC clusters and the uniformity of SiC particles. Solid fraction, particle size and oxidation of SiC particles had strong impacts on the overall quality of the MMCs. The MMCs produced by 40% solid fraction and oxidized micron-sized SiC particles exhibited an excellent casting quality. A low-quality MMC was obtained when non-oxidized sub-micron sized SiC particles were employed. The results showed the formation of various types intermetallic particles and carbides such as MgO, Mg2Si, Al2MgC2, Mg2C3, Al4C3 as the interfacial reaction products of SiC/Mg alloy’s melts. Mg hydride (α-MgH2) was also identified in inter-dendritic regions of the MMCs for the first time.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 94, p. 176-189
Keywords [en]
Metal-matrix composites (MMCs), Microstructure, Magnesium alloys, Casting
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-29719DOI: 10.1016/j.compositesb.2016.02.019ISI: 000376052600018Scopus ID: 2-s2.0-84962734666OAI: oai:DiVA.org:hj-29719DiVA, id: diva2:917480
Available from: 2016-04-06 Created: 2016-04-06 Last updated: 2017-11-30Bibliographically approved

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Wessén, MagnusJarfors, Anders E.W.

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JTH. Research area Materials and manufacturing – Casting
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Metallurgy and Metallic Materials

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