Internal friction peaks due to oxygen, nitrogen and hydrogen in V-Nb alloys
Richter's and Snoek's original works established the existence of an anelastic relaxation produced by a stress-induced interstitial reorientation in bcc metals. This anelastic relaxation, now referred to as a Snoek peak, has been studied extensively and well characterized in the past for the interstitials carbon, nitrogen, and oxygen. The existence of a hydrogen Snoek peak in bcc metals has been a matter of some controversy, however. We have studied relaxation peaks in V, Nb, and V-Nb alloys recently. The alloys have complete mutual solubility and are of interest since they have an extremely high room temperature solid solubility for hydrogen. They also have, over a certain composition range, not shown any hydride phase precipitation at temperatures as low as 4K. Thus, if a hydrogen Snoek peak does exist, it should be found in such alloys. Indeed there is evidence now of a spectrum of hydrogen relaxation peaks below room temperature. Furthermore, due to the difference in the atomic radii of V and Nb there is a large misfit in dilute alloys of these elements. This and possibly some chemical interaction can cause trapping (or antitrapping) of the interstitials at the substitutional sites, causing solute-interstitial peaks. The present paper provides an overview of our observations regarding: (1) the effect of hydrogen on the oxygen and nitrogen Snoek peaks in pure V and Nb, (2) the oxygen relaxation peaks in V-Nb alloys, (3) the hydrogen relaxation spectrum in V-Nb alloys, and (4) the effect of oxygen on the hydrogen relaxation spectrum in V-Nb alloys.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5429816
- Report Number(s):
- IS-M-683; CONF-910374-2; ON: DE92012155
- Resource Relation:
- Conference: American Society for Testing and Materials (ASTM) symposium on mechanics and mechanisms of material damping, Baltimore, MD (United States), 13-15 Mar 1991
- Country of Publication:
- United States
- Language:
- English
Similar Records
Internal friction peaks due to interstitials in bcc alloys
Effects of oxygen and hydrogen on tensile and internal friction properties of niobium-vanadium alloys
Related Subjects
NIOBIUM ALLOYS
INTERNAL FRICTION
VANADIUM BASE ALLOYS
BCC LATTICES
HYDROGEN
INTERSTITIALS
NIOBIUM
NITROGEN
OXYGEN
VANADIUM
ALLOYS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
ELEMENTS
FRICTION
METALS
NONMETALS
POINT DEFECTS
TRANSITION ELEMENTS
VANADIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies