Structure of heterophases aluminium cast composites contained chromium amd titanium carbides
Anna Dolata-Grosz*, Bolesław Formanek**, Józef Śleziona***, Jakub Wieczorek*** *Politechnika Śląska, Wydział Inżynierii Materiałowej i Metalurgii, Katedra Technologii Stopów Metali i Kompozytów ul. Krasińskiego 8, 40-019 Katowice **Politechnika Śląska, Wydział Inżynierii Materiałowej i Metalurgii, Katedra Nauki o Materiałach, ul. Krasińskiego 8, 40-019 Katowice ***Politechnika Śląska, Wydział Inżynierii Materiałowej i Metalurgii, Katedra Technologii Stopów Metali i Kompozytów ul. Krasińskiego 8, 40-019 Katowice
Quarterly No. 3, 2005 pages 81-85
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abstract The process of producing and the structure of aluminium matrix cast composites with composite powders containing chromium and titanium carbides has been presented in the article. The reinforcing phases were using by NiCr-Cr3C2-TiC powder mixtures formed in a self-propagating high-temperature synthesis process (SHS). The structure and phase composition of the composite powder used for the matrix alloy modification are shown in Figures 1-3. A composite alloys AlMg10/NiCr-Cr3C2-TiC was produced by two casting methods: mechanical mixing at 720oC and centrifugal casting with vertical rotational axis, after which its structure was determined. Optical microscopy, electron scanning microscopy and X-ray phase analysis were used to characterize the microstructure of the composites produced. The structure of the composite casts obtained by the mechanical mixing processes are presented in Figures 4 and 5. The fabricated AlMCs are characterized by the complex structure of different morphology and chemical constitution reinforcing phases. The designed process allows for the structure modification of the applied casting aluminium alloys in different technological variants. The macrostructure and microstructure of aluminium cast composite obtaining by the centrifugal method are presented in Figure 6. Key words: aluminium alloy, composite powders, intermetallic phases, mechanical mixing, centrifugal casting, structure