Internal friction peaks due to interstitials in bcc 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, there is a large misfit of V in Nb and Nb in V and, possibly, some chemical interaction such that trapping (or antitrapping) of the interstitials at the substitutional sites, causing solute-interstitial peaks, can be characterized. The present paper provides an overview of our observations regarding: the effect of hydrogen on the oxygen and nitrogen Snoek peaks in pure V and Nb, The oxygen relaxation peaks in V-Nb alloys, The hydrogen relaxation spectrum in V-Nb alloys, and the effect of oxygen on the hydrogen relaxation spectrum in V-Nb alloys. 52 refs., 13 figs., 3 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6048754
- Report Number(s):
- IS-M-662; CONF-910374--1; ON: DE91007411
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELEMENTS
FRICTION
HYDROGEN
INTERNAL FRICTION
INTERSTITIALS
METALS
NIOBIUM
NIOBIUM ALLOYS
NONMETALS
OXYGEN
POINT DEFECTS
RELAXATION
TRANSITION ELEMENTS
VANADIUM
VANADIUM ALLOYS