Regularities of Varying the Dislocation Substructure of Copper during Creep in the Magnetic Field

Abstract

The object of the study was polycrystalline copper of the M006 brand. The dislocation substructure (DSS), which is formed in copper during the destruction in creep conditions in the magnetic field of 0,35 T, is investigated by diffraction electron microscopy. The substructure of the starting state of copper is characterized by the presence of the following DSS types: chaotically distributed dislocations (56 %), cellular substructure of various degrees of perfection (36 %), net-like substructure (5 %), striated substructure (3 %), dislocation bundles (3 %), and torn subgrains (2 %). It is established that the features in the quantitative ratio of DSS types are revealed during the destruction in the magnetic field. Notably, a subgrain structure is the main DSS type near the destruction zone in copper deformed under creep conditions without the magnetic field. The imposition of the magnetic field leads to a decrease in the relative content of the subgrain structure by a factor of almost 2. It is shown that the effect of the magnetic field retards the reconstruction of the dislocation substructure under the creep of copper, which improves strength characteristics.