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Dilute Solution of H in bcc Ti35Cr65-xVx Alloys

Published online by Cambridge University Press:  01 February 2011

Giovanni Mazzolai
Giovanni Mazzolai*
Affiliation:
giovanni.mazzolai@fisica.unipg.it, University of Perugia, Department of Physics, Via A.Pascoli 5, Perugia, 06123, Italy
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Abstract

The solubility of H in the solid solution phase of the Ti35Cr47V18 alloy has been investigated at high and low temperature. The Sieverts law has been found to hold for 808 K≤T≤1204 K and fail for 302 K≤T≤335 K. For H contents nH ≤0.07 (nH=H/Me) the partial molar enthalpy and partial non-configurational entropy at high temperature are:

On heating the material under H2 gas pressures lower than 0.1 MPa H absorption only occurs above 700 K. Below this temperature, surface oxide films prevent H uptake. Thermal decomposition spectroscopy of the α phase carried out for nH≤0.24 exhibits a single peak whose temperature increases with decreasing nH owing to selective occupancy by H of energetically non-degenerate interstitial sites.

Keywords

energy-storagealloyabsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1042: Symposium S – Materials and Technology for Hydrogen Storage , 2007 , 1042-S03-26
Copyright
Copyright © Materials Research Society 2008

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