Grain Refinement of Al Cast by Novel Al-Al2.5Cu0.5Ti Refiner Fabricated by Cold Pressing

Abstract

It is reported that alloying with Cu causes the transformation from the D022 type structure of Al3Ti into L12 cubic structure. Since the lattice constant of Al2.5Cu0.5Ti with L12 structure is a = 0.3927 nm, smaller disregistry value between Al and Al2.5Cu0.5Ti can be achieved. In this study, novel refiner for Al cast containing Al2.5Cu0.5Ti intermetallic compound particles with L12 structure is fabricated by cold pressing. It is found that the grains of Al cast are partially refined by using the novel refiner, although microstructure of Al grain is not homogeneous. In this way, the Al2.5Cu0.5Ti intermetallic compound particles with L12 structure can become favorable heterogeneous nucleation sites for Al cast.