Phase equilibria of the Zn-Bi-Ni system at 600 oC and 750 oC

The 600 oC and 750 oC isothermal sections of the Zn-Bi-Ni ternary system have been determined experimentally using scanning electron microscopy coupled with energy dispersive X-ray spectroscopy and X-ray diffraction. Three three-phase regions exist in the isothermal section at 600 oC and 750 oC, respectively. The Ni-Zn phases are all in equilibrium with the liquid phase in these two isothermal sections. There is a four-phase equilibrated reaction occurred between 450 oC and 600 oC, namely β1 + NiBi ↔ L + α-Ni, but more experimental works are needed for obtaining the accurate equilibrated reaction temperature. Experimental results show that Bi is almost insoluble in any Ni-Zn compounds and α-Ni. The solid solubility of Zn in the NiBi phase is also limited.