Experimental investigation and thermodynamic calculation of the Fe-Si-Sn system

Phase equilibrium of the Fe-Si-Sn ternary system was investigated using equilibrated alloys. The samples were characterized by means of scanning electron microscopy equipped with energy dispersive X-ray spectrometry and X-ray diffraction. Isothermal sections of the Fe-Si-Sn system at 700 °C and 890 °C each consists of 5 three-phase regions. No ternary compound was found at those two temperatures. The solubility of Sn in the Fe-Si binary phases and the solubility of Si in the Fe-Sn binary phases is limited. Furthermore, thermodynamic extrapolation of the Fe-Si-Sn system was carried out. Calculated solidification path and phase relationship agreed well with experimental results.