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The isothermal section of the Zn-Bi-Ni temary system at 450℃ was determined experimentally using the equilibrated alloys approach．The specimens were investigated by means of optical microscopy，SEM-EDS analysis and x·ray diffraction．Six three-phase regions exist in this isothermal section．The L-Bi phase is in equilibrium with all phases ofNi-Zn binary system except the a-Ni phase．Experimental results indicate that the third element,Zn or Bi．is almost insoluble in the Bi-Ni or Ni-Zn intermetallic compounds．