Pressure Dependence of Shear Stress During High-Pressure Torsion of Au-Co Alloys in Liquid Nitrogen

T. P. Tolmachev; V. P. Pilyugin; A. M. Patselov; N. V. Nikolayeva; A. M. Vlasova

doi:10.17804/2410-9908.2021.3.006-016

T. P. Tolmachev, V. P. Pilyugin, A. M. Patselov, N. V. Nikolayeva, A. M. Vlasova

PRESSURE DEPENDENCE OF SHEAR STRESS DURING HIGH-PRESSURE TORSION OF Au-Co ALLOYS IN LIQUID NITROGEN

DOI: 10.17804/2410-9908.2021.3.006-016

Measurements of shear stress were for the first time carried out during mechanical alloying by high-pressure torsion of a gold-cobalt powder mixture at cryogenic temperature under various pressures. The pressures were about 5, 8, 10, and 12 GPa. The Au-Co system is characterized by limited solubility and different properties of the constituents. It has been found that, in comparison with the data obtained for torsion at room temperature, the shear stress values are higher both at the stage of initial intensive growth and subsequently, upon reaching saturation. With an increase in the pressure of low-temperature torsion, a corresponding increase in resistance to shear strain is observed at all the stages of processing. In this case, the shape of the curves at each new pressure changes, as does the staging of the strain dependence. This reflects the extreme heterogeneity of the phase composition and structure formation in the non-equilibrium alloy. The most intense reflections in the X-ray diffractogram correspond to a supersaturated fcc solid solution of cobalt based on gold. Also as a result of mechanical alloying, the components of the system are evenly distributed on the fracture surface of the alloy.

Acknowledgements: The research was financially supported by the RFBR under project No. 19-32-60039 and partially under the state assignment from the Ministry of Education and Science of the Russian Federation (theme Pressure, No. AAAA-A18-118020190104-3). The materials were produced and processed at the IMP UB RAS, Ekaterinburg. The electron microscope investigations were made with the use of the equipment of the Testing Center of Nanotechnology and Advanced Materials shared access center at the IMP UB RAS, Ekaterinburg.

Keywords: mechanical alloying, high-pressure torsion, cryogenic deformation, Au-Co system of limited solubility, in-situ shear stress vs strain

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Т. П. Толмачев, В. П. Пилюгин, А. М. Пацелов, Н. В. Николаева, А. М. Власова

ВЛИЯНИЕ БАРИЧЕСКИХ УСЛОВИЙ НА ЗАВИСИМОСТЬ НАПРЯЖЕНИЯ СДВИГА ПРИ КРУЧЕНИИ ПОД ВЫСОКИМ ДАВЛЕНИЕМ В ЖИДКОМ АЗОТЕ СПЛАВОВ СИСТЕМЫ Au-Co

Впервые проведено измерение напряжения сдвига при механическом сплавлении кручением под высоким давлением в условиях криогенной температуры компонентов системы с ограниченной растворимостью золото–кобальт при различных значениях давления обработки, которые составляли около 5, 8, 10 и 12 ГПа. Установлено, что по сравнению с данными, полученными при кручении в условиях комнатной температуры, значения напряжения сдвига выше как на стадии начального интенсивного роста, так и впоследствии – при выходе на насыщение. С повышением давления при низкотемпературном кручении наблюдается соответствующее возрастание сопротивления деформации сдвига на всех этапах обработки. При этом вид кривых при каждом новом давлении изменяется, как изменяется и стадийность деформационной зависимости, что отражает крайнюю неоднородность процессов формирования структуры и фазового состава получаемого сплава. По рентгеновским данным установлено, что в результате низкотемпературной совместной деформации компонентов изучаемой системы формируется преимущественно пересыщенный ГЦК-твердый раствор кобальта на основе золота. Компоненты системы в результате механического сплавления распределены равномерно на поверхности излома сплава.

Благодарности: Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта № 19-32-60039 и частично в рамках государственного задания МИНОБРНАУКИ России (тема «Давление», № АААА-А18-118020190104-3). Получение и обработка материалов производились на базе ИФМ УрО РАН, г. Екатеринбург. Электронно-микроскопические исследования проводились на оборудовании ЦКП «Испытательный центр нанотехнологий и перспективных материалов» ИФМ УрО РАН, г. Екатеринбург.

Ключевые слова: механическое сплавление, кручение под высоким давлением, криодеформация, система ограниченной растворимости золото-кобальт, in situ напряжение сдвига от величины деформации

Библиография:

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Effect of high-pressure torsion on the structure and properties of the natural layered amorphous-crystalline Ti2NiCu composite / R. V. Sundeev, A. V. Shalimova, N. N. Sitnikov, O. P. Chernogorova, A. M. Glezer, M. Y. Presnyakov, I. A. Karateev, E. A. Pechina, A. V. Shelyakov // Journal of Alloys and Compounds. – 2020. – Vol. 845. – P. 156273. – DOI: 10.1016/j.jallcom.2020.156273.
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Shear stress in high-pressure torsion and vickers hardness of Au-Co alloys / T. P. Tolmachev, V. P. Pilyugin, A. M. Patselov, A. V. Plotnikov, R. V. Churbaev // AIP Conference Proceedings. – 2020. – Vol. 2315. – P. 040046. – DOI: 10.1063/5.0036671.
Structural features of the Au-Co alloy after mechanical alloying at cryo- and room temperatures according to X-ray diffractometry / T. P. Tolmachev, V. P. Pilyugin, A. M. Patselov, Yu. V. Solov’eva, R. V. Churbaev, A. V. Plotnikov // Russian Physics Journal. – 2021. – (In press).

Библиографическая ссылка на статью

Pressure Dependence of Shear Stress During High-Pressure Torsion of Au-Co Alloys in Liquid Nitrogen / T. P. Tolmachev, V. P. Pilyugin, A. M. Patselov, N. V. Nikolayeva, A. M. Vlasova // Diagnostics, Resource and Mechanics of materials and structures. - 2021. - Iss. 3. - P. 6-16. -
DOI: 10.17804/2410-9908.2021.3.006-016. -
URL: http://dream-journal.org/issues/2021-3/2021-3_322.html
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