Structure and Thermal Stability of Tin Bronze Nanostructured by High Pressure Torsion

A. V. Stolbovsky; V. V. Popov; E. N. Popova

doi:10.17804/2410-9908.2015.5.118-132

A. V. Stolbovsky, V. V. Popov, E. N. Popova

STRUCTURE AND THERMAL STABILITY OF TIN BRONZE NANOSTRUCTURED BY HIGH PRESSURE TORSION

DOI: 10.17804/2410-9908.2015.5.118-132

The evolution of the structure of bronze containing 7.4 wt. % Sn under severe plastic deformation by high pressure torsion has been studied by transmission electron microscopy and microhardness measurements. The thermal stability of the structures obtained has been investigated in subsequent annealing. It is demonstrated that the presence of an enhanced amount of impurities considerably retards the relaxation processes. It is shown that, along with an enhanced thermal stability of the nanostructures obtained, the transition from the overall growth of crystallite sizes at heating to the dramatic development of recrystallization processes in the alloy under study is much smoother than in pure metals.

Keywords: nanostructuring, nanostructures, severe plastic deformation, high-pressure torsion, grain boundaries, thermal stability, tin bronze

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$Fig. 2. The structure of the bronze after 1-revolution HPT (a, b) and 5-revolution HPT (c, d): a, c – bright fields; b, d – dark fields in the (111)Cu reflection and electron diffraction patterns$

$Fig. 5. The structure of the bronze after 1-revolution HPT (a, b) and 5-revolution HTP (c, d) and annealing at 200 °С: a, c – bright fields; b, d – dark fields in the (111)Cu reflections and electron diffraction patterns$ $Fig. 6. The structure of the bronze after 1-revolution HPT (a, b) and 5-revolution HPT (c, d) and annealing at 250 °С: a, c – bright fields; b, d – dark fields in the (111)Cu reflections and electron diffraction patterns$ $Fig. 7. The structure of the bronze after 1-revolution HPT (a, b) and 5-revolution HPT (c, d) and annealing at 300°С: a, c – bright fields; b, d – dark fields in the (111)Cu reflections and electron diffraction patterns$ $Fig. 8. The structure of the bronze after 1-revolution HPT (a, b) and 5-revolution HPT (c, d) and annealing at 350 °С: a, c – bright fields; b, d – dark fields in the (111)Cu reflections and electron diffraction patterns$

А.В. Столбовский, В.В. Попов, Е.Н. Попова

СТРУКТУРА И ТЕРМИЧЕСКАЯ СТАБИЛЬНОСТЬ ОЛОВЯНИСТОЙ БРОНЗЫ, НАНОСТРУКТУРИРОВАННОЙ МЕТОДОМ КРУЧЕНИЯ ПОД ВЫСОКИМ ДАВЛЕНИЕМ

Методами просвечивающей электронной микроскопии и измерения микротвердости исследована эволюция структуры бронзы с содержанием 7,4 мас. % олова при интенсивной пластической деформации кручением под высоким давлением при комнатной температуре. Изучена термическая стабильность получаемой структуры при последующих отжигах. Показано, что повышенное содержание примесей существенно замедляет релаксационные процессы. Установлено, что наряду с повышенной термической стабильностью полученной наноструктуры, переход от равномерного общего увеличения размеров кристаллитов при нагреве к резкому развитию рекристаллизационных процессов в изучаемом сплаве заметно более плавный, чем в чистых металлах.

Ключевые слова: Наноструктурирование, наноструктуры, интенсивная пластическая деформация, кручение под высоким давлением, границы зерен, термическая стабильность, оловянистая бронза

Библиография:

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Structure and properties of grain boundaries in submicrocrystalline W obtained by severe plastic deformation / V. V. Popov, R. Z. Valiev, E. N. Popova, A. V. Sergeev, A. V. Stolbovsky, V. U. Kazihanov // Defect and Diffusion Forum. – 2009. – Vol. 283–286. – P. 629–638. – DOI: 10.4028/www.scientific.net/DDF.283-286.6299.
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Библиографическая ссылка на статью

Stolbovsky A. V., Popov V. V., Popova E. N. Structure and Thermal Stability of Tin Bronze Nanostructured by High Pressure Torsion // Diagnostics, Resource and Mechanics of materials and structures. - 2015. - Iss. 5. - P. 118-132. -
DOI: 10.17804/2410-9908.2015.5.118-132. -
URL: http://dream-journal.org/issues/2015-5/2015-5_52.html
(accessed: 31.10.2024).