Iranian Journal of Materials Science and Engineering

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Gholami M, Divandari M. Interfacial Phases and Defects Characteristics of Al/Cu-Zn Bimetal Produced via Centrifugal Casting Process. IJMSE 2018; 15 (4) :52-61
URL: http://ijmse.iust.ac.ir/article-1-1084-en.html

Centrifugal casting process, in both horizontal and vertical mode, is considered as an efficient method to produce bimetallic components. Al/Cu₆₅Zn₃₅ couples were prepared by the vertical centrifugal casting process. In this study, different volume of molten aluminum having melt-to-solid (m/s) volume ratios (VR) of 1.5 and 2.5, were cast into preheated brass bush rotating at 800, 1600, and 2000 (rpm), respectively. The thickness of the interface, which is composed of three different zones, is depended on the rotational speed and the (VR) and was at least 490µm (at VR=1.5 and 2000 rpm) and at most 1480 µm (at VR=2.5 and 800 rpm). The results of optical microscopy, energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction analysis showed that the interface layers are composed of Al₂Cu₅Zn₄, Al₃Cu₃Zn, Al₂Cu precipitates dispersed in the matrix and finally α-Al/Al₂Cu anomalous eutectic structure near the aluminum side. Gas pore entrapment and oxide film entrainment defect was detected within the interface next to the aluminum base metal.