560℃ isothermal section of the Zn-Fe-Ni-Si quaternary system at the zinc-rich corner

摘要

The 560℃ isothermal section of the Zn-Fe-Ni-Si quaternary system with the Zn composition being fixed at 93 at.% has been determined using optical microscopy, scanning electronic microscopy coupled with energy dispersive X-ray spectroscopy, and X-ray diffractometry. It was found that FeSi is in equilibrium with almost all phases in the section, including the 5-Fe-Zn, FeSi{sub}2, T (Zn-Fe-Ni ternary compound), γ-Ni-Zn, NiSi{sub}2 and liquid phases. The existence of the L + FeSi + NiSi{sub}2 + γ-Ni-Zn four-phase equilibrium prevents other Ni-Si compounds from entering equilibrium with the liquid phase at 560℃. No true quaternary compound was found in the present study.