The zinc-rich corner of the Zn-Fe-Ni-Si quaternary system at 450 °C |
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Authors: | X P Su and N Y Tang |
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Affiliation: | (1) Institute of Materials Research, School of Mechanical Engineering Xiangtan University, 411105 Xiangtan, Hunan, P.R. China;(2) Teck Cominco Metals Ltd., Product Technology Centre, 2380 Speakman Drive, L5K 1B4 Mississauga, Ontario, Canada |
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Abstract: | Following up on recent studies of the Zn-rich corners of the Zn-Fe-Ni and Zn-Fe-Si ternary systems, a 450 °C isothermal section
of the Zn-Fe-Ni-Si quaternary phase diagram with the Zn composition being fixed at 93 at.% was determined experimentally using
optical microscopy, scanning electron microscopy (SEM) coupled with energy dispersive x-ray spectroscopy (EDS), and x-ray
diffractometry (XRD). FeSi was found to be in equilibrium with almost all phases in the section, including the T, ζ, Ni-δ,
NiSi2, and FeSi2 phases, as well as the liquid phase (L). Silicon solubilities in the T, ζ, and Ni-δ phases were rather limited. However,
the solubilities of Fe and Zn in the NiSi2 phase, at 4.5 at.% and 7.2 at.%, respectively, were appreciable. The existence of the (L+NiSi2+Ni-δ) three-phase equilibrium state apparently prevents other Ni-Si compounds from entering equilibrium with the liquid at
450 °C. No true quaternary compound was found in the study. |
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