Melt-Solid-Gas behavior in the interface of Al/Mg composite produced by centrifugal casting

Al/Mg composite have new applications in various industries such as car manufacturing and aerospace. In this work characteristic of metallurgical interface and the behavior of melt-solid-gas during production of Al/Mg composite via vertical centrifugal casting process was investigated Aluminium melt, at 700 oC and volume ratio of nearly one, was poured into a solid Mg rings preheated up to 30, 100, 150 and 200 oC, respectively while rotating at 1200 rpm, in a vertical centrifugal casting machine. After casting samples were cut and interfacial microstructure was studied by optical and scanning electron microscopes. Results show that the heat content of Al melt lead to dissolving preference prominent locations and creating local Mg rich regions. Study of the Al/Mg interface also showed that intermetallic compounds, Al3Mg2, Al12Mg17 are formed. Furthermore, gas pores may form, on notches present on the rough surface of the solid Mg ring, possibly as a result of melt/gas reaction. Possible states and conditions of the formation of bubble and gas porosity are discussed.