Microstructure of Ti-Ag immiscible alloys with liquid phase separation

Takeshi Nagase, Megumi Matsumoto, Yoshikazu Fujii

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Ti-Ag alloy is characterized by a flat liquidus line in the binary phase diagram. The microstructure of binary Ti-Ag alloys was investigated in terms of liquid phase separation. In the Ti-rich Ti66.67Ag33.33 alloy, the conventionally cast ingot showed a dendritic structure that included Ti-Ag-based intermetallic compounds; on the other hand, the rapidly solidified melt-spun ribbon showed a particulate microstructure comprising Ag-rich globules and a Ti-rich matrix phase. The formation of emulsion-like structures in the rapidly solidified specimens can be explained in terms of liquid phase separation. In the Ag-rich Ti33.33Ag66.67 alloy, macroscopic phase-separated ingots were obtained via liquid phase separation. The metastable liquid miscibility gap in Ti-Ag alloy system was discussed based on thermodynamics.

Original languageEnglish
Pages (from-to)440-447
Number of pages8
JournalJournal of Alloys and Compounds
Volume738
DOIs
Publication statusPublished - 2018 Mar 25
Externally publishedYes

Keywords

  • Metallography
  • Metals and alloys
  • Microstructure
  • Rapid-solidification
  • Titanium alloys
  • Transmission electron microscopy

ASJC Scopus subject areas

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

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