Интенсивная пластическая деформация меди при криогенной температуре

The production of metallic submicrocrystalline and nanocrystalline materials with desired physicochemical properties is an important problem of modern materials science [1]. To date, several attempts have been made to grind grain size through deformation at a cryogenic temperature [2–4], and most of this work was carried out on highly plastic copper. An urgent task is a detailed study of the microstructure after cryogenic deformation, as well as its formation mechanisms. This work was aimed at certifying the microstructure of copper subjected to low-temperature deformation. For the certification of the microstructure, a relatively new method of automatic analysis of backscattered electron diffraction patterns (EBSD) was used [5]

Аномальный рост зерен в криогенно-деформированной меди

Structural changes in cryogenically deformed copper during long-term (up to two years) room-temperature ageing were investigated. It is found that the structure formed under high (e=8.2) cryogenic deformation is unstable and is characterized by abnormalous grain growth. It is shown that the grain growth is preceded by a long (up to a year) incubation period. It is revealed that the structure rapidly losses stability with an increase in accumulated cryogenic strain

Криогенная деформация меди

The effect of cryogenic deformation on the structure refinement of copper was studied

Формирование микроструктуры в ходе криогенной прокатки меди

Проведена тщательная аттестация микроструктуры и механических свойств меди, подвергнутой различной степени криогенной прокатки. Показано, что эволюция зеренной структуры, в основном, определялась геометрическим эффектом деформации. На основе анализа текстурных данных был сделан вывод, что криогенные условия деформации не привели к фундаментальному изменению характера пластического течения, и основным механизмом деформации было дислокационное {111} скольжение. Установлено, что криогенная прокатка приводит к существенному увеличению прочности и некоторому снижению пластичности

Влияние криогенной осадки на микроструктуру катаной мелкозернистой меди

Исследована возможность существенного измельчения зерен в технически чистой меди путем криогенной осадки. Установлено, что эволюция структуры в целом определялась сплющиванием исходных зерен в ходе деформации. Анализ текстурных данных и спектра разориентировок показал, что основным механизмом пластического течения являлось обычное {111} дислокационное скольжение при несущественном вкладе механического двойникования

Влияние криогенной прокатки на микроструктуру и механические свойства меди

The effect of cryogenic rolling on the structure and mechanical properties of copper was studied. The grain structure evolution was shown to be mainly governed by the geometrical effect of the imposed strain whereas the contribution of the mechanical twinning and grain subdivision was found to be not significant. The analysis of the developed texture demonstrated that the plastic flow arises mainly from conventional {111} slip. The cryogenic rolling was shown to increase strength and decrease ductility and both effects might be attributed to the substructure

Пластическая деформация меди при криогенной температуре

The production of submicrocrystalline and nanocrystalline materials with desired properties is an important task of modern materials science [1]. One of the promising directions in this area is deformation at a cryogenic temperature [2-5]. However, the effectiveness of this approach is not yet completely clear, and therefore the urgent task is to study the microstructure after cryogenic deformation, as well as the mechanisms of its formation

Оценка эффективности криогенной деформации для измельчения микроструктуры крупнозернистой меди

Influence of cryogenic conditions of deformation on refining the structural Cu components in case of initial large grain structure. It has been found that deformation at cryogenic temperature intensifies process of forming the strain origin boundaries and activates mechanical twinning, however, does not make it possible to obtain nanocrystalline structures

Об эффективности криогенной деформации для измельчения микроструктуры меди

In the work, we studied and compared the microstructures of commercially pure copper subjected to the same strain at room temperature and at liquid-nitrogen temperature. It is found that at rather low plastic strain (slump, e=1.0), cryogenic temperature assists the activation of mechanical twinning and somewhat accelerates the formation of deformation boundaries. At high plastic strain (high-pressure shear, e=8.4), cryogenic temperature adds too little to microstructure refinement