The structure of centrifugal casts in Al-FeO⋅TiO2 composite
Anna Dolata-Grosz, Józef Śleziona, Jakub Wieczorek, Bolesław Formanek Politechnika Śląska, Wydział Inżynierii Materiałowej i Metalurgii, ul. Krasińskiego 8, 40-019 Katowice
Annals 4 No. 10, 2004 pages 164-169
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abstract Aluminium metal matrix composites with intermetallic particles are new group of constructional materials. The methods of incorporating fine dispersed particles into a liquid metal applied up to now, make use of the in situ reaction (exchange reaction, aluminothermal reaction) becomes between a liquid metal and the incorporated reacting substance (in gas, liquid or solid form). The new technological concept production of composites reinforcement intermetalic and ceramic fine dispersed phases with liquid matrix in this paper has been shown. The composite suspension of ilmenite powders (FeO⋅TiO2) in liquid aluminium have been produced by stirring method together with centrifugal casting. In the next step used the two-stage high temperature synthesis. The scheme of installation for synthesis process have been presented in Figure 1. The aim of investigations was structural analysis for aluminium metal matrix composites with illmenite particles about known chemical composition (Tab. 1). The morphology of ilmenite particles has been shown in Figure 1. The metallographic research used for cast composites after centrifugal casting and after synthesis process, too (Figs. 3, 4). One the basis of the structural observation results of composite fabrication the reinforcement of concentration phases has been assessment. During the research the phase’s identification after centrifugal casting before synthesis (Fig. 5a) and after the two-stage high temperature synthesis (Fig. 6a) in composites has been performed. In composite the Al3Ti, Al3Fe and Al2O3 phases has been obtained (Fig. 6). Key words: in situ composites, stirring method, aluminium, ilmenite, centrifugal casting, intermetallic particles, structure