Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing
The temperature dependences of acoustic properties of nanostructured and polycrystalline zirconium are investigated in the temperature range of 100–340 K. The effect of severe plastic deformation and subsequent annealing on key parameters of the Koiwa–Hasiguti acoustic relaxation in zirconium is stu...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/4170187 |
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| author | P. P. Pal-Val L. N. Pal-Val A. P. Rybalko E. N. Vatazhuk |
| author_facet | P. P. Pal-Val L. N. Pal-Val A. P. Rybalko E. N. Vatazhuk |
| author_sort | P. P. Pal-Val |
| collection | DOAJ |
| description | The temperature dependences of acoustic properties of nanostructured and polycrystalline zirconium are investigated in the temperature range of 100–340 K. The effect of severe plastic deformation and subsequent annealing on key parameters of the Koiwa–Hasiguti acoustic relaxation in zirconium is studied in detail. It is established that, due to intensive plastic deformation, the relaxation strength considerably increases, and the temperature and the width of the corresponding relaxation peak systematically decrease with reduction of the mean grain size in the samples. Annealing leads to a partial recovery of the relaxation strength and the peak temperature back to the initial values in undeformed samples, but the width of the relaxation peak shows an additional decrease. The majority of the effects observed can be explained by changes in dislocation subsystems of the samples during intensive plastic deformation and annealing. An influence of a random scatter of the relaxation time on the main parameters of the Koiwa–Hasiguti peak is established using the statistical analysis based on the lognormal distribution. It is shown that the parameter β of the lognormal distribution determines the width, height, and asymmetry of the peak and also allows estimating the relaxation strength from the peak height. An algorithm for retrieving the parameter β from experimental data is presented. |
| format | Article |
| id | doaj-art-906f023f21da454ba5cac9e4530b6275 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-906f023f21da454ba5cac9e4530b62752025-02-03T05:53:54ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/41701874170187Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and AnnealingP. P. Pal-Val0L. N. Pal-Val1A. P. Rybalko2E. N. Vatazhuk3B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Nauki Ave. 47, Kharkov 61103, UkraineB. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Nauki Ave. 47, Kharkov 61103, UkraineS. Kuznets Kharkov National University of Economics, Nauki Ave. 9a, Kharkov 61166, UkraineB. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Nauki Ave. 47, Kharkov 61103, UkraineThe temperature dependences of acoustic properties of nanostructured and polycrystalline zirconium are investigated in the temperature range of 100–340 K. The effect of severe plastic deformation and subsequent annealing on key parameters of the Koiwa–Hasiguti acoustic relaxation in zirconium is studied in detail. It is established that, due to intensive plastic deformation, the relaxation strength considerably increases, and the temperature and the width of the corresponding relaxation peak systematically decrease with reduction of the mean grain size in the samples. Annealing leads to a partial recovery of the relaxation strength and the peak temperature back to the initial values in undeformed samples, but the width of the relaxation peak shows an additional decrease. The majority of the effects observed can be explained by changes in dislocation subsystems of the samples during intensive plastic deformation and annealing. An influence of a random scatter of the relaxation time on the main parameters of the Koiwa–Hasiguti peak is established using the statistical analysis based on the lognormal distribution. It is shown that the parameter β of the lognormal distribution determines the width, height, and asymmetry of the peak and also allows estimating the relaxation strength from the peak height. An algorithm for retrieving the parameter β from experimental data is presented.http://dx.doi.org/10.1155/2018/4170187 |
| spellingShingle | P. P. Pal-Val L. N. Pal-Val A. P. Rybalko E. N. Vatazhuk Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing Advances in Materials Science and Engineering |
| title | Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing |
| title_full | Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing |
| title_fullStr | Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing |
| title_full_unstemmed | Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing |
| title_short | Change of Parameters of the Koiwa–Hasiguti Dynamic Dislocation Relaxation in Nanostructured and Polycrystalline Zirconium after Severe Plastic Deformation and Annealing |
| title_sort | change of parameters of the koiwa hasiguti dynamic dislocation relaxation in nanostructured and polycrystalline zirconium after severe plastic deformation and annealing |
| url | http://dx.doi.org/10.1155/2018/4170187 |
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