Abstract
The article presents the evaluation results of impacts of various strengthening mechanisms to flow stress. Such evaluations were made on the basis of the measured parameters of the dislocation substructure formed in monocrystals of [001]-Ni3Fe alloy deformed by compression within the stage II. It was found that the main impact to deformation resistance in the alloys with net substructure is made by the mechanism of dislocation impediment, which is caused by contact interaction between moving dislocations and forest dislocations.
Highlights
The plastic deformation of metal materials takes place in a hierarchically organized wide interval of scales which is closely connected for the with the initial defect structure [1, 2]
The single-phase alloys with f.c.c. lattice, monocrystals, are characterized by rather prolonged linear strengthening which is most pronounced for the single crystals with symmetric orientations [3]
At the low temperatures the deformation is mostly provided by the dislocation movement
Summary
The plastic deformation of metal materials takes place in a hierarchically organized wide interval of scales which is closely connected for the with the initial defect structure [1, 2]. The single-phase alloys with f.c.c. lattice, monocrystals, are characterized by rather prolonged linear strengthening (stage II) which is most pronounced for the single crystals with symmetric orientations [3]. In such materials the slipping dislocations and moving point defects can be slowed down by various mechanisms and the strengthening has a complex nature. At present there are about 60 of such mechanisms, 50 of them are the low temperature ones This fact alone allows us to realize that to understand and describe the hierarchically organized multifactor multistage strengthening at the plastic deformation even of the materials with the f.c.c. lattice is a difficult task. It is no wonder that it is still a topical problem
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