Solidification process and mechanical behavior of the Nb/Nb 5Si 3 two phase alloys in the Nb-Ti-Si system

Nobuaki Sekido, Yoshisato Kimura, Seiji Miura, Yoshinao Mishima

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Design of two-phase alloys consisting of niobium solid solution (A2) and α-Nb 5Si 3 (D8 l) phases in the Nb-Ti-Si ternary system is pursued for ultra-high temperature structural applications. Compositional and annealing conditions are determined for the formation of A2/D8 l lamellar microstructure via eutectoid decomposition of Nb 3Si (tP32) phase in the Nb-Si binary and Nb-Ti-Si ternary system. Addition of titanium is found to result in increased room temperature toughness, but decreased high temperature strength. Enhancement of mechanical properties is achieved by applying the directional solidification technique. Mechanical properties of the alloys are discussed from microstructural point of view.

Original languageEnglish
Pages (from-to)3264-3271
Number of pages8
JournalMaterials Transactions
Volume45
Issue number12
DOIs
Publication statusPublished - 2004 Dec 1
Externally publishedYes

Keywords

  • Eutectoid reaction
  • Fracture toughness
  • Phase equilibria
  • Solidification

ASJC Scopus subject areas

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

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