Grain-Subgrain Structure and Vacancy-Type Defects in Submicrocrystalline Nickel at Low Temperature Annealing; Acta Physica Polonica A; Vol. 128, iss. 4 : International Symposium on Physics of Materials ISPMA-13
| Parent link: | Acta Physica Polonica A Vol. 128, iss. 4 : International Symposium on Physics of Materials ISPMA-13.— 2015.— [P. 714-717] |
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| Coauteur: | |
| Andere auteurs: | , , , , , |
| Samenvatting: | Title screen Scanning tunneling microscopy, positron annihilation and X-ray diffraction were applied for the study of annealing of submicrocrystalline nickel prepared by equal channel angular pressing. Several processes were revealed in the structure of submicrocrystalline nickel on different scale levels during annealing in the range Δ T=(20÷360)°C. A decrease of grain nonequiaxiality and further structure refinement were observed with a temperature increase in the range Δ T=(20÷180)°C. Subgrain growth with maximum =60 nm at 120°C occurred on the lower scale level within the same temperature range. Grain growth and microstress decrease in submicrocrystalline nickel observed at T>180°C indicate the beginning of recrystallization. The main positron trap centers were identified in submicrocrystalline nickel within different temperature ranges. In as-prepared samples positrons are trapped at dislocation-type defects and vacancy clusters that can include up to 5 vacancies. At the annealing temperature Δ T=(20÷180)°C positrons are trapped at low-angle boundaries enriched by impurities. Within the range Δ T=(180÷360)°C the dominant trap is dislocations. |
| Taal: | Engels |
| Gepubliceerd in: |
2015
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| Onderwerpen: | |
| Online toegang: | http://dx.doi.org/10.12693/APhysPolA.128.714 |
| Formaat: | Elektronisch Hoofdstuk |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=647887 |
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