Effect of lamellar spacing on the mechanical properties of (Nb)/(Nb, Ti)5Si3 two-phase alloys

Nobuaki Sekido, Yoshisato Kimura, Fu Gao Wei, Seiji Miura, Yoshinao Mishima

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Effects of lamellar spacing on the mechanical properties of (Nb)/(Nb, Ti)5Si3 two-phase alloys with a fine lamellar structure have been investigated for an improvement in room-temperature toughness and high-temperature strength. Lamellar spacing of the alloy are controlled, without changing the volume fraction and composition of each phase, by varying annealing temperature for the decomposition of high-temperature phase (Nb, Ti)3Si into (Nb) and (Nb, Ti)5Si3. A Time-Temperature-Transformation diagram (TTT diagram) was determined for a Nb-25 mol%Si-10 mol%Ti alloy. It was found that the decomposition of (Nb, Ti)3Si in the Nb-Si-Ti system is kinetically faster than that of Nb3Si in the binary Nb-Si system. Average lamellar spacing, λ, of the alloy is characterized by the degree of super-cooling, ΔT, following a relationship as 'λ∝1/ΔT'. Coarse lamellar structure shows better room temperature compressive plastic strain before fracture and higher elevated temperature strength. The alloys investigated in this study show superior compressive strength at over 1000°C as compared with some commercial Ni-based superalloys.

Original languageEnglish
Pages (from-to)1056-1061
Number of pages6
JournalUnknown Journal
Volume64
Issue number11
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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