Initial Stages in the Evolution of the Structure of a Zirconium Pseudo-Single Crystal During Shear Deformation under Pressure

L. Yu. Egorova; Yu. V. Khlebnikova; V. P. Pilyugin; E. G. Chernyshev

doi:10.17804/2410-9908.2017.5.070-079

L. Yu. Egorova , Yu. V. Khlebnikova , V. P. Pilyugin , E. G. Chernyshev

INITIAL STAGES IN THE EVOLUTION OF THE STRUCTURE OF A ZIRCONIUM PSEUDO-SINGLE CRYSTAL DURING SHEAR DEFORMATION UNDER PRESSURE

DOI: 10.17804/2410-9908.2017.5.070-079

The structural-phase transformation in a pseudo-single crystal of zirconium during deformation on Bridgman anvils is studied by X-ray spectroscopy with synchrotron radiation. The angles of rotation in Bridgman anvils is varied from φ = 0° (deformation by upsetting, е = 0.2) to φ = 45° (е = 4.6). It is demonstrated that the α-phase lattice is compressed at the value of true strain e = 4.6. On the contrary, the ω-phase arising in the process of deformation under pressure shows a tendency to stretching. This behavior can probably be explained by low atomic density and strong anisotropy in terms of the atomic density of the planes and series of the ω-phase. It has been determined that the structure of the baric ω-phase arising during deformation under the deformation conditions ranging from e = 0.5 to e = 4.6 undergoes no textural changes. The formation of groups of planar defects in the ω-phase is a mechanism for the compensation of elastic stresses during the α→ω lattice transformation under conditions of high quasi-hydrostatic pressure.

Acknowledgements: "Structure", No. 01201463331

Keywords: pseudo-single crystal of zirconium, deformation, high quasi-hydrostatic pressure, α↔ω phase transitions

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Л. Ю. Егорова , Ю. В. Хлебникова, В. П. Пилюгин , Е. Г. Чернышев

НАЧАЛЬНЫЕ ЭТАПЫ ЭВОЛЮЦИИ СТРУКТУРЫ ПСЕВДОМОНОКРИСТАЛЛИЧЕСКОГО ЦИРКОНИЯ ПРИ ДЕФОРМАЦИИ СДВИГОМ ПОД ДАВЛЕНИЕМ

Проведено исследование начальных этапов эволюции структуры псевдомонокристаллического циркония при деформации на наковальнях Бриджмена с использованием метода рентгеновской дифрактометрии в синхротронном излучении на просвет. Углы поворота наковальни варьировали от φ = 0° (деформация осадкой, е = 0,2) до φ = 45° (е = 2,7). Установлено, что при величине истинной деформации е = 2,7 параметры кристаллической решетки α-фазы уменьшаются. В то же время параметры решетки барической ω-фазы, наоборот, незначительно увеличиваются. Такое поведение, вероятно, можно объяснить небольшой атомной плотностью и сильной анизотропией по атомной плотности плоскостей и рядов ω-фазы. Определено, что структура возникающей в процессе деформации барической ω-фазы в условиях деформирования от е = 0,3 до е = 2,7 не претерпевает текстурных изменений. Образование групп планарных дефектов в ω-фазе представляет собой механизм компенсации упругих напряжений при трансформации кристаллической решетки α→ω в условиях высокого квазигидростатического давления.

Благодарности: Работа выполнена в рамках государственного задания ФАНО России по теме “Структура”, № 01201463331

Ключевые слова: псевдомонокристалл циркония, деформация, высокое квазигидростатическое давление, α↔ω фазовые переходы

Библиография:

Orientation relationship between α-phase and high-pressure ω-phase of pure group IV transition metals / N. Adachi, Y. Todaka, H. Suzukib, M.Umemotoa // Scripta Materialia. – 2015. – Vol. 98. – P. 1–4. – DOI: 10.1016/j.scriptamat.2014.10.029
Fenga Biao, Levitas Valery I. Plastic flows and strain-induced alpha to omega phase transformation in zirconium during compression in a diamond anvil cell: Finite element simulations // Materials Science & Engineering A. – 2017. – Vol. 680. – P. 130–140. – DOI: 10.1016/j.msea.2016.10.082
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Библиографическая ссылка на статью

Initial Stages in the Evolution of the Structure of a Zirconium Pseudo-Single Crystal During Shear Deformation under Pressure / L. Yu. Egorova, Yu. V. Khlebnikova, V. P. Pilyugin, E. G. Chernyshev // Diagnostics, Resource and Mechanics of materials and structures. - 2017. - Iss. 5. - P. 70-79. -
DOI: 10.17804/2410-9908.2017.5.070-079. -
URL: http://dream-journal.org/issues/2017-5/2017-5_146.html
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