Growth behavior and interfacial character of Ir3y precipitates in the Ir2y lave phase matrix

N. Sekido, Y. Yamabe-Mitarai

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

A C15 Laves phase Ir2Y that forms in the Ir-Y binary system develops off-stoichiometry toward the Ir-rich composition at high temperatures, and its range of homogeneity becomes narrow with decreasing temperatures. One consequence of this solubility behavior is the formation of Ir3Y precipitates within the Ir2Y matrix of an Ir-30mol%Y alloy. The orientation relationship between Ir3Y and Ir2Y has been identified as: (0001)Ir3Y // (111)Ir2Y and [21̄1̄0]Ir3Y // [1̄10]Ir2Y. The similarity in the crystal structures of the two phases yields a plate-like Ir3Y precipitate showing a typical Widmanstätten structure. The growth of the precipitates has been suggested to follow the ledge mechanism. The interfacial character between the two phases has been identified in this study.

Original languageEnglish
Pages (from-to)447-454
Number of pages8
JournalMaterials Transactions
Volume51
Issue number3
DOIs
Publication statusPublished - 2010 Mar

Keywords

  • Laves phase
  • Ledge growth
  • Orientation relationship
  • Precipitation
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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