Abstract
Measurements of internal friction as a function of temperature were performed in samples of Nb containing different amounts of substitutional (Zr) and interstitial (O, N) solutes. These data were resolved using the method of successive subtraction, into a series of constituent Debye peaks corresponding to different interactions. For each relaxation process we obtained the height (Q-1max) and temperature (Tp) of the peak, the activation energy (E) and the relaxation time (t0). The height, shape and temperature of the peaks depend on the concentration of interstitial and substitutional elements. With the addition of substitutional solute one can observed interactions between the two types of solutes (substitutional and interstitial), showing that the random distribution of the interstitial atoms was affected by presence of substitutional atoms. The peaks observed were associated with matrix-interstitial (Nb-O, Nb-N) and substitutional-interstitial (Zr-O) interaction processes.
Highlights
Metals with body-centered cubic (BCC) lattice containing solute atoms dissolved interstitially often show anelastic behavior due to a process known as stress induced ordering
In the present work the internal friction was measured as a function of temperature in samples of Nb with differents amounts of substitutional (Zr) and interstitials (O, N) solutes and were identified matrix-interstitial and substitutionalinterstitial interaction processes
Experimental spectra of internal friction as a function of temperature were obtained for the Nb and Nb-Zr alloys
Summary
Metals with body-centered cubic (BCC) lattice containing solute atoms dissolved interstitially often show anelastic behavior due to a process known as stress induced ordering. One manifestation of this anelastic behavior is the internal friction (Q-1), which was originally observed by Snoek[1] in Fe containing carbon and nitrogen as interstitial solutes in octahedral positions of the type (1/2, 0, 0) and (1/2, 1/2, 0) that produce a strain tensor that has local tetragonal symmetry causing anelasticity. Several techniques can be used to measure the internal friction[2,3,4,5], of these the torsion pendulum is one which is suitable to the study of metal heavy interstitial solute interactions (such as carbon, nitrogen or oxygen). In the present work the internal friction was measured as a function of temperature in samples of Nb with differents amounts of substitutional (Zr) and interstitials (O, N) solutes and were identified matrix-interstitial and substitutionalinterstitial interaction processes
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