Grain-Subgrain Structure and Vacancy-Type Defects in Submicrocrystalline Nickel at Low Temperature Annealing

Grain-Subgrain Structure and Vacancy-Type Defects in Submicrocrystalline Nickel at Low Temperature Annealing

Opis bibliograficzny
Parent link:	Acta Physica Polonica A Vol. 128, iss. 4 : International Symposium on Physics of Materials ISPMA-13.— 2015.— [P. 714-717]
Korporacja:	Национальный исследовательский Томский политехнический университет Физико-технический институт Кафедра общей физики
Kolejni autorzy:	Kuznetsov P. V. Pavel Viktorovich, Lider A. M. Andrey Markovich, Bordulev Yu. S. Yuri Sergeevich, Laptev R. S. Roman Sergeevich, Rakhmatulina T. V. Tanzilya Vakiljevna, Korznikov A. V. Aleksandr Veniaminovich
Streszczenie:	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.
Wydane:	2015
Hasła przedmiotowe:	электронный ресурс труды учёных ТПУ
Dostęp online:	http://dx.doi.org/10.12693/APhysPolA.128.714
Format:	Elektroniczne Rozdział
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=647887

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