Bulk Fe-Al-C nanoalloys made by mechanically alloying with subsequent spark plasma sintering and their mechanical properties

Yoritoshi Minamino, Yuichiro Koizumi, Nobuhiro Tsuji, Naoko Hirohata, Kiyoshi Mizuuchi, Yoshihira Ohkanda

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Three kinds of bulk nanocrystalline Fe-24at%Al-Xat%C (X=1,2,4) alloy were produced from Fe and Al powders with addition of methanol by MA with subsequent SPS at 1273K under 64MPa. Their microstructure and mechanical properties were investigated. The compacts have the relative densities of 99.97% (lat%C) to 99.6% (4at%C). The structure of compacts with lat%C is composed of Fe 3Al grains of 1.5μm in diameter and nano κ-carbides (Fe 3AlC0.5) precipitates, while those of compacts with 2 and 4at%C are composed of nanocrystalline Fe3Al of about 80nm in diameter, nano κ-carbides and α-grains of about 1μm in diameter. These structures have the good thermal stability, maintaining the nanostructure even at 973K. The mechanical properties of these compacts were measured by compression tests at R.T. to 973K. The compacts with lat%C and 2at%C of this work perform the superior mechanical properties (e.g. yield strength of 2.15GPa and rupture strain of 0.14 for compact with 2at%C at R.T.) when compared with the ordinary Fe3Al casting (e.g. 380MPa and 0.12). They also exhibit no environmental embrittlement, which is one of fatal problems for the ordinary Fe3Al mateials.

Original languageEnglish
Pages (from-to)103-110
Number of pages8
JournalSolid State Phenomena
Volume101-102
DOIs
Publication statusPublished - 2005

Keywords

  • Bulk nanocrystalline alloy
  • Compression test
  • Environmental embrittlement
  • Mechanical alloying
  • Rupture strain
  • Spark plasma sintering
  • Yield strength

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics

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