Table of Contents
Textures and Microstructures
Volume 19, Issue 1-2, Pages 29-43
http://dx.doi.org/10.1155/TSM.19.29

Texture and Anisotropy by Formation and Decomposition of Nickel Hydride

Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1040, Bulgaria

Received 22 November 1990

Copyright © 1992 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of microstructure and crystal direction on the extent of phase transformation (EPT) of Ni into β-NiH by cathodic charging with H has been investigated by X-ray diffraction, EPT is controlled by the crystal direction in the case of heat-treated specimens. In the case of electrodeposited specimens, the imperfections of which are commensurate with those of cold-worked metals, EPT is controlled by both the crystal direction and the “dislocation-induced” anisotropy at the same time. The decomposition of β-NiH follows the Kolmogorov–Avrami–Johnson–Mehl kinetics. The microstructural anisotropy induces anisotropy in the rate of decomposition of β-NiH.