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A new semi-solid casting technique for fabricating SiC-reinforced Mg alloys matrix composites

Mohsen Esmaily (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Seyedeh Nooshin Mortazavi (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; Jan-Erik Svensson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; Mats Halvarsson (Institutionen för fysik, Materialens mikrostruktur (Chalmers)) ; M. Wessen ; Lars-Gunnar Johansson (Institutionen för kemi och kemiteknik, Oorganisk miljökemi) ; A. E. W. Jarfors
Composites Part B-Engineering (1359-8368). Vol. 94 (2016), p. 176-189.
[Artikel, refereegranskad vetenskaplig]

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 (alpha-MgH2) was also identified in inter-dendritic regions of the MMCs for the first time.

Nyckelord: Metal-matrix composites (MMCs), Microstructures, Casting, Magnesium alloys



Denna post skapades 2016-06-17.
CPL Pubid: 237878

 

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