Hydrogen and deuterium diffusion in vanadium alloys

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:5669185

Herro, H M

Hydrogen and deuterium diffusion coefficients were measured between 473 and 230 K in alloys of vanadium containing titanium or niobium. Boltzmann-Matano techniques allowed the measurement of the hydrogen concentration dependence of the diffusion coefficient. In addition, one of these techniques permitted a determination of the terminal hydrogen solid solubility which was greatly increased by alloying. Both the hydrogen and deuterium diffusion coefficients were found to decrease with hydrogen isotope concentration in all alloys at all temperatures. The effect of niobium additions was to markedly reduce the rate of hydrogen migration to a minimum in the 75 at. pct. Nb alloy. The rate of hydrogen migration decreased with titanium concentration up to 30 at. pct. Ti, the highest concentration examined in that alloy system. The diffusion coefficients exhibited an Arrhenius temperature dependence and the resulting diffusion activation energy and D/sub o/ values both increased with titanium and with niobium concentration to a maximum of 75 at. pct. Nb. Deuterium diffusion activation energies were larger than corresponding hydrogen values in all alloys. The diffusion behavior found in these alloys is not well represented by current local deep trapping models.

• OSTI ID: 5669185
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
DEUTERIUM
DIFFUSION
ELEMENTS
HYDROGEN
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
MIGRATION
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PERMEABILITY
SOLUBILITY
STABLE ISOTOPES
TITANIUM ADDITIONS
TITANIUM ALLOYS
VANADIUM ALLOYS
VANADIUM BASE ALLOYS