Ion species/energy dependence of irradiation-induced lattice structure transformation and surface hardness of Ni3Nb and Ni3Ta intermetallic compounds

H. Kojima, Y. Kaneno, M. Ochi, S. Semboshi, F. Hori, Y. Saitoh, N. Ishikawa, Y. Okamoto, A. Iwase

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Bulk samples of Ni3Nb and Ni3Ta intermetallic compounds were irradiated with 16 MeV Au, 4.5 MeV Ni, 4.5 MeV Al, 200 MeV Xe and 1.0 MeV He ions, and the change in near-surface lattice structure was investigated by means of the grazing incidence x-ray diffraction (GIXD) and the extended x-ray absorption fine structure (EXAFS). The Ni3Nb and Ni3Ta lattice structures transform from the ordered structures (orthorhombic and monoclinic structures for Ni3Nb and Ni3Ta, respectively) to the amorphous state by the Au, Ni, Al and Xe ion irradiations. Irrespective of such heavy ion species or energies, the lattice structure transformation to the amorphous state almost correlate with the density of energy deposited through elastic collisions. In the case of the samples irradiated with 1.0 MeV He ions, however, no amorphization was observed even when the density of elastically deposited energy is the same as that for Au irradiated sample which showed the amorphous phase. The change in Vickers hardness induced by the amorphization was also measured and was discussed in terms of ion fluence and the density of deposited energy.

Original languageEnglish
Pages (from-to)739-748
Number of pages10
JournalMaterials Transactions
Volume58
Issue number5
DOIs
Publication statusPublished - 2017

Keywords

  • Amorphization
  • Dependence on deposited energy density
  • Ion irradiation
  • Lattice structure transformation
  • NiNb
  • NiTa
  • Vickers hardness

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Ion species/energy dependence of irradiation-induced lattice structure transformation and surface hardness of Ni<sub>3</sub>Nb and Ni<sub>3</sub>Ta intermetallic compounds'. Together they form a unique fingerprint.

Cite this