Measurement of hydrogen solubility and desorption rate in V-4Cr-4Ti and liquid lithium-calcium alloys

Technical Report · Tue Apr 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/543272· OSTI ID:543272

Park, J. H.; Erck, R.; Park, E. T. ^[1]

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1. Argonne National Lab., IL (United States); and others

Hydrogen solubility in V-4Cr-4Ti and liquid lithium-calcium was measured at a hydrogen pressure of 9.09 x 10{sup {minus}4} torr at temperatures between 250 and 700{degrees}C. Hydrogen solubility in V-4Cr-4Ti and liquid lithium decreased with temperature. The measured desorption rate of hydrogen in V-4Cr-4Ti is a thermally activated process; the activation energy is 0.067 eV. Oxygen-charged V-4Cr-4Ti specimens were also investigated to determine the effect of oxygen impurity on hydrogen solubility and desorption in the alloy. Oxygen in V-4Cr-4Ti increases hydrogen solubility and desorption kinetics. To determine the effect of a calcium oxide insulator coating on V-4Cr-4Ti, hydrogen solubility in lithium-calcium alloys that contained 0-8.0 percent calcium was also measured. The distribution ratio R of hydrogen between liquid lithium or lithium-calcium and V-4Cr-4Ti increased as temperature decreased (R {approx} 10 and 100 at 700 and 250{degrees}C, respectively). However at <267{degrees}C, solubility data could not be obtained by this method because of the slow kinetics of hydrogen permeation through the vanadium alloy.

• Research Organization: Oak Ridge National Lab., TN (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 543272
• Report Number(s): DOE/ER--0313/21; ON: DE97008798
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHROMIUM ALLOYS
DESORPTION
HYDROGEN
PROGRESS REPORT
SOLUBILITY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
TITANIUM ALLOYS
VANADIUM BASE ALLOYS