Effect of impurities on dynamic recrystallization in copper deformed in Bridgman anvils

Abstract

The structure of copper with a various content of impurities (0.01, 0.03, and 0.1 wt %) is studied after high pressure torsion at room temperature. It is shown that the content of impurities does not affect the true strain (e = 2) required for the onset of dynamic recrystallization (DR). It has been revealed that the temperature-strain-rate conditions (lnZ), which were the same for copper of various purity, are responsible for the degree of the dynamic recrystallization completeness and the respective type of the formed structure. The correspondence between the range of lnZ and the structure type formed during deformation has been established. Impurity dragging prevents grain growth upon postdynamic recrystallization and ensures the formation of a more dimensionally uniform structure at the stage of partial DR. At the stage of developed DR, the content of impurities in copper does not affect the grain size. Kaigorodova L.I., Rasposienko D.Yu., Pushin V.G., Pilyugin V.P., Smirnov S.V. Structure and mechanical properties of aging Al-Li-Cu-Zr-Sc-Ag alloy after severe plastic deformation by high-pressure torsion. Keywords

Grain growth in dynamically recrystallized copper during annealing above and below the temperature of thermally activated nucleation

“…Обычно эволюцию структуры меди описывают в терминах холодной деформации, когда структура формируется в условиях непрерывного накопления дефектов [9][10][11]. Если подходить к большой пластической деформации меди, как к горячей деформации, то формирующаяся структура будет определяться не только величиной деформации (е), но и температурно-скомпенсированной скоростью деформации (lnZ) [12]. Этот параметр определяет соотношение процессов накопления дефектов, динамического возврата и динамической рекристаллизации.…”