Internal friction studies of the effect of hydrogen on the oxygen snoek peaks in V and Nb

Indrawirawan, H.; Brasche, L.; Owen, C.V.; Rehbein, D. K.; Carlson, O. N.; Peterson, D.T.; Buck, O.

doi:10.1016/0022-3697(87)90048-5

Cited by 7 publications

(6 citation statements)

References 17 publications

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“…The peaks observed in the anelastic spectrum can be associated with the interaction of oxygen atoms (main peak) and nitrogen atoms (secondary peak) with the metallic matrix, Nb(or Ta)-O and Nb(or Ta)-N, respectively. These peaks are very well known and are attributed to the stress-induced ordering of oxygen and nitrogen atoms around Nb (or Ta) atoms in the lattice [10][11][12][13][14][15] . Figures 1 and 2 also show the behavior of frequency (related with the shear modulus) with temperature.…”

Section: Resultsmentioning

confidence: 99%

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Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy

et al. 2005

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Impurity interstitial atoms present in metals with BCC structure can diffuse in the metallic matrix by jumps to energetically equivalent crystallographic sites. Anelastic spectroscopy (internal friction) is based on the measurement of mechanical loss or internal friction as a function of temperature. Due to its selective and nondestructive nature, anelastic spectroscopy is well suited for the study of diffusion of interstitial elements in metals. Internal friction measurements were made using the torsion pendulum technique with oscillation frequency of a few Hz, temperature interval from 300 to 700 K, heating rate of about 1 K/min, and vacuum better than 10 -5 mbar. The polycrystalline Nb and Ta samples used were supplied by Aldrich Inc. The results obtained showed thermally activated relaxation structures due to stress-induced ordering of oxygen atoms around the Nb (or Ta) atoms of the metallic matrix. The results were interpreted by three methods and led to activation enthalpy values for the diffusion of oxygen in Nb and Ta of 1.15 eV and 1.10 eV, respectively.

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Section: Resultsmentioning

confidence: 99%

“…In the last twenty years, the amount of information on relaxation peaks due interstitial oxygen and nitrogen in Nb and Ta has increased sharply [10][11][12][13][14] . The positions of these peaks with respect to temperature are relatively well known, as are the activations energies and the pre-exponential factors 11 .…”

Section: Introductionmentioning

confidence: 99%

Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy

et al. 2005

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“…In recent decades, internal friction measurements have been used as a rich source of information on solutes interstitially diffused in metals and metallic alloys, since they provide information regarding diffusion, interstitial concentrations, solubility limits, precipitation phenomena, interaction between interstitials and other imperfections in the crystalline lattice [2][3][4][5][6][7] . Today, more than fifty years after the discovery of the "Snoek Peaks", studies are still being made to clarify the relaxation mechanisms in pure metals 8,9 and metallic alloys such as Nb-Ti 10,11 and Nb-Zr 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Activation Energy Measurement of Oxygen Ordering in a Nb-Ti Alloy by Anelastic Relaxation

et al. 2002

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Metals with bcc structure are able to dissolve large amounts of interstitial element atoms in the form of oxygen. These atoms diffuse through the lattice by jumping into octahedral sites with equivalent symmetry, causing strong alterations in the anelastic behavior. This paper reports on a study of Snoek relaxation in Nb-Ti alloys with oxygen in solid solution, based on internal friction as a function of temperature. The internal friction measurements were taken in a torsion pendulum operating at temperatures in the range of 350 to 650 K, with frequencies varying from 6 to 36 Hz. The results show relaxation spectra in which thermally activated relaxation peaks produced by the stress-induced ordering of oxygen atoms around niobium atoms of the metallic matrix were identified.

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“…The use of internal friction to study interstitials in refractory alloys has found renewed interest in recent years (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20).…”

Section: Discussionmentioning

confidence: 99%

“…The use of internal friction to determine relaxation parameters has had wide application to bee metals (2,(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). Of particular interest is the Snoek relaxation which is defined as the stress induced reorientation of interstitial atoms in a bee matrix (1).…”

Section: Theory Of Anelastic Response In Bcc Metalsmentioning

confidence: 99%

Effect of hydrogen, deuterium and oxygen on the anelastic properties of refractory alloys

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Internal friction studies of the effect of hydrogen on the oxygen snoek peaks in V and Nb

Cited by 7 publications

References 17 publications

Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy

Measurement of oxygen atom diffusion in Nb and Ta by anelastic spectroscopy

Activation Energy Measurement of Oxygen Ordering in a Nb-Ti Alloy by Anelastic Relaxation

Effect of hydrogen, deuterium and oxygen on the anelastic properties of refractory alloys

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