Processing, microstructure, and mechanical properties of (Nb)/Nb5Si3 two-phase Alloys

Yoshisato Kimura, Hiroaki Yamaoka, Nobuaki Sekido, Yoshinao Mishima

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

It has been shown that a fine lamellar structure composed of Nb solid solution, (Nb), and Nb5Si3 is formed through eutectoid decomposition in the Nb-Si binary system and its ternary derivatives. Such alloys would exhibit a high strength at over 1400 K, yet showing room-temperature toughness of over 10 to 20 MPa m1/2 if a proper lamellar spacing is chosen. In the present work, effects of processing on the microstructure evolution and mechanical properties are investigated on the Nb-18 at. pct Si alloys prepared by hot pressing (HP) and spark-plasma sintering (SPS). The powders used in the present work are of pure Nb and Nb5Si3 in order for the fabrication to become possible at temperatures higher than the melting point of Si and to reduce the formation of SiO2. The results show that the SPS yields more uniform two-phase microstructure but the alloy fabricated through HP tends to provide higher elevated temperature strength.

Original languageEnglish
Pages (from-to)483-488
Number of pages6
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume36
Issue number3
DOIs
Publication statusPublished - 2005 Mar
Externally publishedYes

ASJC Scopus subject areas

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

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