Paper Title:
In Situ Measurement of Lattice Spacing of Ternary Ni-Ti-Nb Alloys during Hydrogen Absorption
  Abstract

Microscopic deformation of each crystal of duplex phases of Ni-Ti-Nb alloy due to hydrogen absorption was investigated by X-ray diffraction technique. Ni30Ti30Nb40 which is hydrogen permeation alloy and consists of the primary phase, NbTi, and the eutectic phases, NiTi + NbTi, was used as a specimen. The change of lattice spacing of the specimen during hydrogen absorption was measured by Cu-Kα characteristic X-ray. As a result, the lattice spacing of crystal of NbTi phase increased extremely, while that of NiTi phase increased slightly. It was pointed out that the NbTi phase is responsible for hydrogen absorption in the Ni-Ti-Nb alloy. When hydrogen gas was released from the specimen at high temperature, both lattice spacing returned nearly to those of them before hydrogen absorption, and the specimen kept its original shape. Therefore, it was confirmed that the volume expansion of crystal of the Ni-Ti-Nb alloy due to hydrogen absorption was elastic deformation.

  Info
Periodical
Key Engineering Materials (Volumes 353-358)
Edited by
Yu Zhou, Shan-Tung Tu and Xishan Xie
Pages
655-658
DOI
10.4028/www.scientific.net/KEM.353-358.655
Citation
J. Shibano, Y. Yamamoto, M. Kobayashi, K. Ishikawa, K. Aoki, "In Situ Measurement of Lattice Spacing of Ternary Ni-Ti-Nb Alloys during Hydrogen Absorption", Key Engineering Materials, Vols. 353-358, pp. 655-658, 2007
Online since
September 2007
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