Abstract
The subject of the present review consists of summing up our previous results on the study of the relaxation of structure along the way (i) of atomic redistribution—in the form of short-range clustering in binary iron alloys—induced by megaplastic deformation (i.e., of super large value), and (ii) of the dissolution and precipitation of disperse nitrides and carbides in steels and intermetallics in ageing alloys. Within the capacity of the main method of executing megaplastic deformation, along with the practically important milling in ball mills and friction-providing external action, we employed high pressure torsion (HPT) in Bridgman anvils, which permitted the control of the degree, rate, and temperature of deformation action. At the local level of two nearest neighbors (one or two coordination shells in relation to an iron atom) we studied atomic mass transfer, stipulated by generation of a large number of point defects of deformation origin, and conducted a comparison with a case of irradiation by high-energy electrons. We established a change in the direction of phase transformations, as well as anomalous acceleration of the ordering and precipitation of disperse phases upon altering the temperature (T < 0.3Tmelt) and rate of deformation (from 2 × 10−2 to 8 × 10−2 s−1). We also demonstrated the possibility of regulating the ultra-fine-grained structure with solid–solution strengthening and dispersion hardening.
Highlights
In modern materials science, the scientific direction of deformation-induced nanostructuring and anomalous phase transformations, induced by super-large plastic deformations [1,2,3,4,5,6,7], has acquired active development
Dissipation of the energy of large plastic deformation is accompanied by anomalous structure–phase transformations and cardinally changes the properties of metals and alloys
In the paper ref. [7], the term megaplastic deformation was introduced, and an attempt was made to formulate a unified concept of the process of super-high plastic deformation of solid bodies
Summary
The scientific direction of deformation-induced nanostructuring and anomalous phase transformations, induced by super-large (mega) plastic deformations [1,2,3,4,5,6,7], has acquired active development The topicality of this direction is stipulated by the practical importance of inventions of dispersion-hardened steels, alloys, and nanocomposites [8,9,10,11,12]. In the review the main attention has been to the results of our original thepresent present review the main attention haspaid been paid to the results of investigations our original over the last five onfive the years phaseontransformations in iron alloys andalloys steelsand induced large investigations overyears the last the phase transformations in iron steels by induced plastic deformations The authors these works were initiators the first of studies on anomalous by large plastic deformations.
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