Materials Science Forum, Vol.408-4, 1771-1776, 2002
Evaluation of casting textures in Al/Al3Ti platelet functionally graded material fabricated by a centrifugal solid-particle method
In this study, crystal orientation of the Al matrix in Al/Al3Ti FGMs fabricated by the centrifugal solid-particle method was investigated by using orientation image microscopy (OIM). It was found that strong orientation of the Al3Ti platelets was developed in the FGM fabricated under large G number, which is the ratio of the centrifugal force to the gravity. Contrary to the expectation, strong texture of the Al matrix was not developed in the FGM even by solidification under strong centrifugal force, Moreover, there exists no specific relationship of crystallographical orientation between Al matrix and Al3Ti platelets. Therefore, it would be concluded that nucleation and growth of Al matrix grains keeping specific orientation relationship with the pre-existing solid platelets seem to be difficult under dynamic casting with centrifugal force.
Keywords:Al3Ti;casting texture;centrifugal solid-particle method;functionally graded materials FGM;orientation;orientation image microscopy (OIM);platelet particle