Grain Refinement of Al₃Ti Dispersed Aluminum Matrix Composites by Reaction Centrifugal Mixed-Powder Method

抄録

Aluminum matrix composites having dispersoids of Al₃Ti intermetallic compounds can be obtained by reaction centrifugal mixed-powder (RCMP) method. It is reported that Al₃Ti intermetallic compounds act as grain refiners, since the disregistry value between Al₃Ti intermetallic compound phase and Al matrix is smaller than 10%. In terms of lattice registry between Al matrix and Al₃Ti phase, it is expected that the grain structure of Al matrix in Al-Al₃Ti composites becomes more refined than that of centrifugally cast pure Al. In this study, Al-Al₃Ti composites have been cast by the RCMP method. Effects of the Al₃Ti phases around Ti particles formed by reaction between Al and Ti particles during RCMP method on grain refinement behavior of Al matrix have been systematically investigated. Moreover, grain refining performance of Al cast by Al-Ti refiner with grain shaped Ti particles was also studied.