Effect of y and Ni addition on liquid immiscibility in Cu-Zr-Ag ternary alloys

Dora Janovszky, Kinga Tomolya, Maria Sveda, Anna Sycheva, George Kaptay

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Liquid immiscibility was studied in Cu-Zr-Ag-Y and Cu-Zr-Ag-Ni liquid alloy systems. In case of Y addition the liquid decomposes into an Ag-Y rich liquid (L1) and into a Cu-Zr rich liquid (L2). In case of Ni addition the separated liquid phases are Ag-rich and Cu-Zr-Ni rich liquids. Different microstructures were found as function of the volume fraction of the L1 liquid phase. The Y addition increased the field of miscibility gap of the ternary Cu-Zr-Ag system to a greater extent compared to Ni addition. Also, the rate of coalescence of droplets in the Cu-Zr-Ag-Y system was considerably larger compared to the Cu-Zr-Ag-Ni system. These two observations are interconnected: increased miscibility means more positive excess Gibbs energy, which leads to higher liquid/liquid interfacial energy, being the driving force of coalescence. Alloys with different compositions taken from the tip of the wedge have been studied by DSC. The amorphous fraction progressively reduces when increasing the Ag-content. A small amount of amorphous phase was detected by DSC in the alloy with Ag contents of not greater than 50 at%.

Original languageEnglish
Pages (from-to)S616-S620
JournalJournal of Alloys and Compounds
Volume615
Issue numberS1
DOIs
Publication statusPublished - Jan 15 2015

Keywords

  • Ag-Cu-Zr alloy
  • Liquid-liquid separation
  • Miscibility gap
  • Monotectic
  • Rapid solidification

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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