Interaction of dissolved atoms and relaxation due to interstitial atoms in hcp metals |
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Authors: | M. S. Blanter E. B. Granovskiy L. B. Magalas |
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Affiliation: | a Moscow State Academy of Instrumental Engineering and Information Science, Stromynka 20, 107846, Moscow, Russia;b Chemical Abstracts Service, Columbus, OH, USA;c Faculty of Metallurgy and Materials Science, University of Mining and Metallurgy, Al. Mickiewicza 30, 30-059, Kraków, Poland |
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Abstract: | The literature data on the mechanism of internal friction maxima induced by O, N, and C in α-Ti, α-Zr, and α-Hf, are contradictory. They do not answer the question which kind of complexes induces relaxation: interstitial atoms or interstitial atoms with substitutional atoms. To clarify this question, modeling of the short-range order and atomic displacement fields around the solute atom clusters was carried out by the Monte-Carlo technique for typical Ti–O–Zr alloys. The energies of strain-induced (elastic) O–O and O–Zr interactions and displacement fields of host atoms around the solute atoms were calculated and used in modelling. The concentration dependence of relaxation strength due to diffusion under stress of oxygen atoms was evaluated using the values of local displacement around the solute atom complexes. It is shown that the developing short-range order cannot be described by the single O–O or O–Zr pair and the associated relaxation, as simple reorientation of any specific atomic pairs. It seems likely that in many cases the internal friction is caused by more complicated clusters constituted by interstitial and substitutional atoms. |
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Keywords: | Author Keywords: Strain-induced interaction Internal friction α -Ti Computer simulation Solid solution |
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