Phase equilibria in the Sn-Zn-Ni system

Vania Gandova, Delfim Soares, Kristina Lilova, Jean Claude Tedenac, Gueorgui P. Vassilev

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The objective of this study is to elucidate the phase equilibria of the Sn-Zn-Ni system. For this purpose, ternary alloys were synthesized using quartz ampoules and annealing. The samples were characterized using differential scanning calorimetry, X-ray diffraction, optical and scanning electron microscopy and microhardness measurements. The results show relatively significant solubility of tin or zinc (about 10 at.% roughly) in Ni-Zn and Ni-Sn phases, respectively. Moreover, evidence of the presence of two formerly unknown ternary compounds denoted as T1 and T2 was found. The first one has a composition (mole fraction) of about: XSn = 0.38 ± 0.04, XNi = 0.36 ± 0.02, XZn = 0.26 ± 0.03 while the approximate composition of the second is XSn = 0.26 ± 0.03, XNi = 0.55 ± 0.00, XZn = 0.19 ± 0.03. Three unidentified compositions were observed: U1 (XSn = 0.26 ± 0.07, XNi = 0.29 ± 0.03, XZn = 0.45 ± 0.04), U2 (XSn = 0.55 ± 0.01, XNi = 0.21 ± 0.00, XZn = 0.24 ± 0.01), and U3 (XSn = 0.48 ± 0.05, XNi = 0.08 ± 0.00, XZn = 0.44 ± 0.05) but there was still a lack of evidence to categorize any of them as a ternary compound. A tentative isothermal section of the Sn-Zn-Ni phase diagram at 600°C was constructed.

Original languageEnglish (US)
Pages (from-to)257-268
Number of pages12
JournalInternational Journal of Materials Research
Volume102
Issue number3
DOIs
StatePublished - 2011

Keywords

  • Lead-free solders
  • Phase diagram
  • Sn-Zn-Ni system
  • Ternary compounds

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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