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http://earchive.tpu.ru/handle/11683/64780
Название: | Structural Defects in TiNi-Based Alloys after Warm ECAP |
Авторы: | Lotkov, Aleksandr Ivanovich Baturin, Anatoly Anatoljevich Kopylov, Vladimir Iljich Grishkov, Viktor Nikolaevich Laptev, Roman Sergeevich |
Ключевые слова: | TiNi-based alloys; ECAP; microstructure; positron lifetime spectroscopy; nanoclusters; vacancies; dislocations |
Дата публикации: | 2020 |
Издатель: | MDPI AG |
Библиографическое описание: | Structural Defects in TiNi-Based Alloys after Warm ECAP / A. I. Lotkov, A. A. Baturin, V. I. Kopylov [et al.] // Metals. — 2020. — Vol. 10, iss. 9. — [1154, 11p.]. |
Аннотация: | The microstructure, martensitic transformations and crystal structure defects in the Ti50Ni47.3Fe2.7 (at%) alloy after equal-channel angular pressing (ECAP, angle 90°, route BC, 1–3 passes at T = 723 K) have been investigated. A homogeneous submicrocrystalline (SMC) structure (grains/subgrains about 300 nm) is observed after 3 ECAP passes. Crystal structure defects in the Ti49.4Ni50.6 (at%) alloy (8 ECAP passes, angle 120°, BC route, T = 723 K, grains/subgrains about 300 nm) and Ti50Ni47.3Fe2.7 (at%) alloy with SMC B2 structures after ECAP were studied by positron lifetime spectroscopy at the room temperature. The single component with the positron lifetime t1 = 132 ps and t1 = 140 ps were observed for positron lifetime spectra (PLS) obtained from ternary and binary, correspondingly, annealed alloys with coarse-grained structures. This t1 values correspond to the lifetime of delocalized positrons in defect-free B2 phase. The two component PLS were found for all samples exposed by ECAP. The component with t2 = 160 ps (annihilation of positrons trapped by dislocations) is observed for all samples after 1–8 ECAP passes. The component with t3 = 305 ps (annihilation of positrons trapped by vacancy nanoclusters) was detected only after the first ECAP pass. The component with t3 = 200 ps (annihilation of positrons trapped by vacancies in the Ti sublattice of B2 structure) is observed for all samples after 3–8 ECAP passes. |
URI: | http://earchive.tpu.ru/handle/11683/64780 |
Располагается в коллекциях: | Репринты научных публикаций |
Файлы этого ресурса:
Файл | Описание | Размер | Формат | |
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reprint-nw-34048.pdf | 15,11 MB | Adobe PDF | Просмотреть/Открыть |
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