Preparation of nanocrystalline Nb3Al powders by mechanical grinding and alloying

J. Saida, K. Ohsaki, Y. Tanaka, M. Uda, K. Okazaki

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)

Abstract

Nanocrystalline Nb3Al powders were prepared by hydrogen-plasma arc melting followed by mechanical grinding of hydrogen-disintegrated powders. They could be dehydrogenated at and above 873 K to yield a pure Nb3Al intermetallic compound with an apparent activation energy for dehydrogenation of 170 kJ/mol. Mechanical grinding of as-disintegrated powders for 180 ks produced Nb3Al containing a very small amount of hydrogen but their crystallite sizes were about 5 nm. On the other hand, mechanical alloying of elemental Nb and Al powders for 180 ks produced a homogeneous mixture of nanocrystalline Nb3Al of about 5 nm with a small amount of unreacted Nb. The apparent activation energy for forming Nb3Al is 240 kJ/mol. Annealing of MG and MA powders in a temperature range of 873 to 1073 K indicates that only a very slight grain growth occurs.

Original languageEnglish
Pages (from-to)171-176
Number of pages6
JournalMaterials Science Forum
Volume179-181
Publication statusPublished - 1995 Jan 1
Externally publishedYes
EventProceedings of the International Symposium on Metastable, Mechanically Alloyed and Nanocrystalline Materials - Grenoble, Fr
Duration: 1994 Jun 271994 Jul 1

ASJC Scopus subject areas

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

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