Segregation reinforced phase in AlSi/Cr_xC_y composite produced under electromagnetic field

Anna Dulęba, Mirosław Cholewa

Quarterly No. 4, 2011 pages 317-323

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abstract In this paper, the technology of AlSi12Cu2Fe/Cr_xC_y in/ex-situ composites produced with Cr30Fe8C ex situ particles is described. The composites were gravity cast, applying simultaneously an electromagnetic field. The purpose of the investigation was to analyse the influence of the frequency of an electromagnetic field on the segregation, quantity and morphology of the reinforcement phase in an aluminum matrix. The technological concept is based on the assumption that the added chromic-iron particles dissolves in the aluminum matrix and the carbide phase becomes the reinforcement of the composite with a variable portion of Al-CrFe intermetallic phases. On the basis of microstructure observation, the quantity, segregation effect, morphology and the volume fraction of the different phases in the composite material was assessed by microscopical analysis.