Microstructural stability and age-hardening behavior of Re-added dual two-phase Ni3Al and Ni3V intermetallic alloys

Taku Moronaga, Yasuyuki Kaneno, Satoshi Semboshi, Takayuki Takasugi

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The effect of Re addition on the microstructure and hardening behaviour of the dual two-phase Ni3Al (L12) and Ni3V (D022) intermetallic alloy was investigated by scanning electron microscopy, transmission electron microscopy and Vickers hardness test. The two-phase eutectoid microstructure accompanying the Re-rich precipitates were observed in the channel region of the alloys in which Re substituted for Ni but not in those in which Re substituted for Al and V. The concomitant addition of Nb (or Ta) with Re more stabilized the two-phase eutectoid microstructure and consequently more induced the fine precipitates in the channel region. The annealing at temperatures below the eutectoid temperature was necessary to induce the fine precipitates in the channel region and thereby result in the precipitation hardening. The fine precipitation in the channel region and related hardening was attributed to the alloying feature so that Re is soluble in the A1 (fcc) phase at high temperatures and becomes less soluble in the two intermetallic phases decomposed from the A1 phase at low temperatures.

Original languageEnglish
Pages (from-to)3859-3875
Number of pages17
JournalPhilosophical Magazine
Volume95
Issue number34
DOIs
Publication statusPublished - 2015 Dec 2

Keywords

  • NiAl
  • NiV
  • microstructure
  • multiphase intermetallics
  • precipitate-hardening
  • transmission electron microscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

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