Hydrogen Diffusivity and Solubility in Pd Alloys Containing Nanometric Oxides

Abstract:

. The Pd0.97Zr0.03, Pd0.97Ce0.03 and Pd0.97Ce0.015 Zr0.015 alloys were produced and studied in the present paper with respect to the hydrogen diffusivity and solubility. These alloys in the conditions as melted and cold worked, heat treated and also internally oxidized were submitted to hydrogen permeation tests. It was observed that the hydrogen diffusivity is strongly affected by the internal oxidation due to nano-oxides formation in the samples. On the other hand, the hydrogen solubility increases with introduction of defects as dislocations and vacancies introduced by cold working as well as the precipitates due to the internal oxidation. The nature, size and distribution of the precipitates and their influence on the hydrogen permeation parameters are discussed in this work.

• Periodical: Journal of Nano Research (Volume 7)
• Pages: 81-86
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.7.81
• Online since: July 2009
• Authors: Viviane M. Azambuja, Dílson Silva dos Santos, Daniel Fruchart
• Keywords: Hydrogen Diffusivity, Hydrogen Solubility, Internal Oxidation, Pd Alloy, Scanning Electron Microscope (SEM)

References

[1] X. Huang, W. Mader, R. Kirchheim: Acta Metall. Mater. Vol. 39 (1991), p.893.

[2] H. Noh, T.B. Flanagan, R. Balasubramaniam, J.A. Eastman: Scripta Mater. Vol. 34 (1996), p.863.

[3] J. Meijering, Advances in Materials Research, edited by H. Hermann (Wiley, New York, 1971), p.1.

[4] V.M. Azambuja, D.S. Dos Santos, L. Pontonnier, S. Miraglia, D. Fruchart: J. Alloy. Compd. Vol. 346 (2002), p.142.

[5] N. Boes, H. Zuchner: J. Less-Common Metals Vol. 49 (1976), p.223.

[6] V. M. Azambuja and D.S. Dos Santos, L. Pontonnier, M. Morales, D. Fruchart: Scripta Mater. Vol. 54 (2006), p.1779.

DOI: 10.1016/j.scriptamat.2006.01.039

[7] D.S. Dos Santos, S. Miraglia, D. Fruchart, and P.E.V. De Miranda: Defect Diffus. Forum Vols. 194-199 (2001), p.1087.

DOI: 10.4028/www.scientific.net/ddf.194-199.1087

[8] V. M. Azambuja and D.S. Dos Santos: J. Alloy. Compd. Vol. 383 (2004), p.219.