Abstract
The sensitivity of the mechanical properties of materials to violations of the translational invariance of the crystal lattice makes it possible to manipulate these properties in the desired direction by doping or creating solid solutions. In this paper, we theoretically study the mechanisms of such manipulation in relation to materials in which the dislocation mobility is controlled mainly by the potential relief of the crystal lattice, the so-called Peierls relief. Due to the concentration of alloying atoms in dislocation nuclei, which play the role of traps for these atoms, the dynamic properties of the dislocations change, which also leads to modification of the macroscopic mechanical properties of the material. The theory of the doping effect on the kink mechanism for overcoming the Peierls barriers is constructed taking into account the disordered content of solution atoms in dislocation nuclei. In this case, the direct description of the kinetics of elementary processes characteristic of kinks is replaced by a statistical description. The multidirectional effect of fluctuations in the distribution of solution atoms, which increase the frequency of the formation of kink pairs but hinder the propagation of kinks along dislocation lines, is considered. The inhibition of kinks can lead to an anomalous character of their mobility, called quasi-localization. The conditions for the predominance of an accelerating or decelerating factor that correspond in macroscopic terms to hardening or softening of the material are found.
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The work was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of the State Assignment of the Federal Scientific Research Center “Crystallography and Photonics”, Russian Academy of Sciences.
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Petukhov, B.V. Mechanism of Solid-Solution Hardening: Quasi-Localization of Dislocation Kinks. J. Surf. Investig. 17, 971–977 (2023). https://doi.org/10.1134/S1027451023050087
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DOI: https://doi.org/10.1134/S1027451023050087