Reversibility of the \(\beta \rightleftharpoons \alpha \) phase transformations in a Pd–Cu solid solution
- Authors: Ievlev V.M.1,2, Dontsov A.I.2, Maksimenko A.A.2, Roshan N.R.3
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Affiliations:
- Moscow State University
- Voronezh State University
- Baikov Institute of Metallurgy and Materials Science
- Issue: Vol 53, No 5 (2017)
- Pages: 484-488
- Section: Article
- URL: https://journals.rcsi.science/0020-1685/article/view/158217
- DOI: https://doi.org/10.1134/S0020168517050090
- ID: 158217
Cite item
Abstract
Thin samples (about 4 μm in thickness) of membrane foil of a Pd–Cu solid solution have been grown on the surface of a SiO2/Si heterostructure by magnetron sputtering. The key features of \(\beta \rightleftharpoons \alpha \) phase transformations have been identified using X-ray diffraction, Auger electron spectroscopy, energy dispersive X-ray microanalysis, and resistivity measurements during a heating–cooling cycle. The results demonstrate that the phase transformations are reversible only in solid solutions containing an excess of copper in the concentration range corresponding to limiting temperatures near the temperature stability limit of the β-phase. Thermal conditions of membrane element operation have been found that ensure stability of the ordered atomic structure of the foil and, accordingly, its high performance. The \(\beta \rightleftharpoons \alpha \) phase transformation has been shown to be reversible after holding the foil at t = 830°C, in a state with a disordered atomic structure, which ensures restoration of its high hydrogen permeability after diffusion bonding to the case of a membrane element.
About the authors
V. M. Ievlev
Moscow State University; Voronezh State University
Author for correspondence.
Email: rnileme@mail.ru
Russian Federation, Moscow, 119991; Universitetskaya pl. 1, Voronezh, 394006
A. I. Dontsov
Voronezh State University
Email: rnileme@mail.ru
Russian Federation, Universitetskaya pl. 1, Voronezh, 394006
A. A. Maksimenko
Voronezh State University
Email: rnileme@mail.ru
Russian Federation, Universitetskaya pl. 1, Voronezh, 394006
N. R. Roshan
Baikov Institute of Metallurgy and Materials Science
Email: rnileme@mail.ru
Russian Federation, Leninskii pr. 49, Moscow, 119991