A now deformation-semi-solid casting process of highly concentrated Fe containing Al-Si-Cu-Fe cast alloys

A newly proposed process of the deformation-semi-solid casting (D-SSC) process was applied to the highly concentrated Fe containing Al-7%Si-3%Cu-1%Fe alloys (in mass%) to eliminate the harmful influence of impurity Fe. The proposed D-SSC process consists of hot-deformation, heating to the semi-solid temperature and subsequent casting. The markedly improved microstructures and mechanical properties of the fabricated alloys by the D-SSC process were investigated. In the microstructure observation, the size and shape of the characteristic morphologies of the primary alpha-Al phase and the Fe containing intermetallic compound of the beta-Al5FeSi phase were evaluated. The extremely refined beta phase and the finely spheroidized alpha-Al phase are simultaneously achieved by the D-SSC process. The D-SSC process is found to be useful to modify the high amount of Fe into a harmless impurity.