Temperature effect on dislocation structure of Cu-Al and Cu-Mn alloys in low-stability state

Abstract

The paper focuses on the evolution of the dislocation structure in Cu-Аl and Cu-Мn polycrystalline alloys in the low-stability state. Experiments conducted at different temperatures, show that the main structure of alloys having different content of Al and Mn alloying elements, changes insignificantly with increasing temperature in contrast to the density of dislocation barriers, dislocation clusters, dissociated dislocations, and stacking faults. Dislocation parameters of Cu-Mn alloys decrease with increasing temperature, while Cu-Al alloys manifest another behavior.

The temperature effect on the dislocation structure parameters is different in Cu-Аl and Cu-Мn alloys. With increasing strain temperature, the average dislocation density in Cu-Mn alloys decreases, and grows in Cu-Al alloys. Misorientations in the structure, density of extinction contours and subboudaries reduce in Cu-Mn alloys and grow in Cu-Al alloys. It is found that the behavior of the dislocation structure parameters depends on temperature and is different in Cu-Аl and Cu-Мn alloys.