Stability of Homogenous Plastic Deformation in Alloy Single Crystals with L12 Structure Under Tension and Compression

The paper studies the loss of stability of high-temperature, homogenous plastic deformation of alloys with L1(2) structure during the super-localization process. Using methods of mathematical simulation, a joint effect of geometric and physical factors on the stability loss of plastic deformation is analyzed under the tensile and compressive stresses. The properties of elements of the deformable medium are detected, at which the macroscale loss of stability is observed in relation to homogenous plastic deformation. It is found that super-localized plastic compressive deformation occurs when physical softening is ahead of the geometric strengthening. Under the tensile stress, the loss of stability of homogenous plastic deformation always occurs due to necking because the geometric softening begins before physical.