Electron microscopy study of eutectic structure in Nb-Ti-X and Nb-Zr-X (X = Co, Ni) hydrogen permeation alloys

Mitsuhiro Matsuda, Takuya Murasaki, Minoru Nishida, Kazuhiro Ishikawa, Kiyoshi Aoki

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Abstract

The morphology and crystallography of eutectic structures in several niobium-bearing hydrogen permeation alloys such as Nb20Ti 40Ni40. Nb30Ti35Co35. Nb13Zr43Ni44, and Nb25Zr 35Co40 have been investigated by means of transmission electron microscopy. The alloys Nb20Ti40Ni40, Nb30Ti35Co35, and Nb25Zr 35Co40 possess eutectic structures consisting of fine lamellar morphology with Nb-based bcc and B2 intermetallic phases. The Nb 13Zr43Ni44 alloy possesses a eutectic structure consisting of rod-shaped bcc-(Nb, Zr) phase and B33-ZrNi phase which displacively transforms from the B2 high-temperature phase. The eutectic structures in the Nb20Ti40Ni40 and the Nb 25Zr35Co40 alloys exhibit a cube-on-cube orientation relationship between the bcc and B2 phases. The eutectic structure in the Nb13Zr43Ni44 alloy also exhibits a cube-on-cube orientation relationship by considering the lattice correspondence between the B2 and the B33 structures. On the other hand, a unique orientation relationship is found out in the Nb30Ti35Co35 alloy, as follows: (110)(Nb, Ti) // (110)TiCo, [2̄21](Nb, Ti) // [001]TiCo. The atomic arrangements at the eutectic interface are also discussed on the basis of high-resolution observations.

Original languageEnglish
Pages (from-to)2208-2213
Number of pages6
JournalMaterials Transactions
Volume49
Issue number10
DOIs
Publication statusPublished - Oct 1 2008

All Science Journal Classification (ASJC) codes

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

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