Effects of oxygen and hydrogen on tensile and internal-friction properties of niobium-vanadium alloys

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5313654

Indrawirawan, H

The effect of additions of up to 10 at% vanadium on the oxygen Snoek peak in niobium was investigated by an internal friction technique. Vanadium-oxygen interaction peaks were identified at approximately 500 K and 650 K. For the Nb-0.24 at% V and the Nb-0.42 at% V alloys, at an oxygen/vanadium ratio greater than one, the 400 K unperturbed oxygen Snoek peak in niobium appears, thus providing strong evidence for oxygen trapping in these alloys. Internal friction results do not provide evidence of an oxygen-hydrogen interaction. Hydrogen has no observable effect on the oxygen Snoek peak in unalloyed niobium and oxygen has no effect on the peak temperature or activation enthalpy for hydrogen relaxation in the Nb-10 at% V alloy. The effects of oxygen and hydrogen on the tensile properties of the Nb-10 at% V alloy were also studied. The addition of oxygen increases both the thermal and athermal stress components, although the effect is more pronounced on the thermal than on the athermal stress component. The effect of hydrogen on the strengthening and ductility of this alloy is much more pronounced in the presence of oxygen than in the low-oxygen alloy.

• Research Organization: Iowa State Univ. of Science and Technology, Ames (USA)
• OSTI ID: 5313654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
ELEMENTS
FRICTION
HIGH TEMPERATURE
HYDROGEN
INTERNAL FRICTION
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NONMETALS
OXYGEN
TENSILE PROPERTIES
VANADIUM ALLOYS