The effect of mixed RE on the total amount

compositions

and morphology of inclusions in Al-4%Cu alloy and the inspection method for inclusions have been investigated in this paper. The authors compare the refine effect of RE on Al alloy with that of conventional refinement agent. The test results indicate that the inclusion amount in Al-4%Cu alloy treated by RE is remarkably less than that refined by C2Cl5 or non toxic refinement agent. The best refinement and clearing effects can be obtained if addition of 0.3% RE be applied.