STP1169

    Internal Friction Peaks Due to Oxygen, Nitrogen, and Hydrogen in Vanadium-Niobium (V-Nb) Alloys

    Published: Jan 1992


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    Abstract

    Richter's and Snoek's original works established the existence of an anelastic relaxation produced by a stress-induced interstitial reorientation in body-centered-cubic (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 vanadium, niobium, and vanadium-niobium (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 4 K. 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 vanadium and niobium, 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 vanadium and niobium, (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.

    Keywords:

    vanadium, niobium, oxygen, nitrogen, hydrogen, Snoek peaks, anelastic relaxation, trapping, antitrapping, materials damping, internal friction, internal stress, mechanical properties


    Author Information:

    Buck, O
    Program director and professor, professor emeritus, graduate student, associate metallurgist, and professor emeritus, Iowa State University, Ames, IA

    Carlson, ON
    Program director and professor, professor emeritus, graduate student, associate metallurgist, and professor emeritus, Iowa State University, Ames, IA

    Indrawirawan, H
    Program director and professor, professor emeritus, graduate student, associate metallurgist, and professor emeritus, Iowa State University, Ames, IA

    Brasche, LJH
    Program director and professor, professor emeritus, graduate student, associate metallurgist, and professor emeritus, Iowa State University, Ames, IA

    Peterson, DT
    Program director and professor, professor emeritus, graduate student, associate metallurgist, and professor emeritus, Iowa State University, Ames, IA


    Paper ID: STP17965S

    Committee/Subcommittee: E28.10

    DOI: 10.1520/STP17965S


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