High-Energy Cold Plastic Deformation, Diffusion, and Mechanochemical Synthesis

Skakov, Yu. A.

doi:10.1023/b:msat.0000036665.13966.65

Cited by 24 publications

(15 citation statements)

References 14 publications

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“…In modern materials science, 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].…”

Section: Introductionmentioning

confidence: 99%

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Atomic Order and Submicrostructure in Iron Alloys at Megaplastic Deformation

Шабашов

Сагарадзе

Козлов

et al. 2018

Metals

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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.

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Section: Introductionmentioning

confidence: 99%

“…Such phenomena are observed as mechanosynthesis (via mechanical alloying), low-temperature lattice diffusion, etc. [3][4][5][6]. In the paper ref.…”

Section: Introductionmentioning

confidence: 99%

Atomic Order and Submicrostructure in Iron Alloys at Megaplastic Deformation

Шабашов

Сагарадзе

Козлов

et al. 2018

Metals

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“…Moreover, the very role of diffusion in MA is a subject of keen debates in literature: in particular, a series of mutually contradicting papers was published in journal "Metal Science and Heat Treatment" (Farber, 2002;Skakov, 2004;Skakov, 2007;Shtremel', 2002;Shtremel', 2004;Shtremel', 2007). In (Farber, 2002), the physical factors that could be responsible for the acceleration of solid-state diffusion, e.g., generation of nonequilibrium point defects during deformation, were described in detail on a qualitative level but no calculations nor even simple numerical estimates were given.…”

Section: Brief Analysis Of Existing Conceptsmentioning

confidence: 99%

“…In (Farber, 2002), the physical factors that could be responsible for the acceleration of solid-state diffusion, e.g., generation of nonequilibrium point defects during deformation, were described in detail on a qualitative level but no calculations nor even simple numerical estimates were given. Experimental data on the formation of supersaturated solid solutions at MA were reviewed in (Skakov, 2004;Skakov, 2007) and a qualitative hypothesis was presented. In , a model for enhanced diffusion is presented wherein the disclinations (i.e.…”

Section: Brief Analysis Of Existing Conceptsmentioning

confidence: 99%

“…Volume diffusion in substitutional alloys (at close diameters of A and B atoms) can be strongly influenced by the formation of non-equilibrium vacancies and also by generation of interstitial atoms whose diffusion rate is high. In a number of works on IPD, the phenomenon of enhanced diffusion is attributed to the interstitial mechanism (Larikov et al, 1975;Skakov, 2004): highly mobile interstitial atoms (say, of sort A), which in binary substitutional solid solutions normally diffuse via a vacancy mechanism, are formed at the A/B interface due to "pushing" of lattice atoms A into interstices of crystal lattice B by the shear stress. After that, they rapidly diffuse in metal B in the field of an external force, e.g., a pressure jump generated by an incidental collision during MA or by explosion at shockwave processing of metals.…”

Section: Physical Background and Basic Assumptionsmentioning

confidence: 99%

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Modeling Enhanced Diffusion Mass Transfer in Metals during Mechanical Alloying

Хина¹,

Lovshenko²

2011

Mass Transfer in Multiphase Systems and Its Applications

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Synthesis of Hybrid Materials by Severe Plastic Deformation: A New Paradigm of SPD Processing

2015

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An emerging direction of research into severe plastic deformation (SPD), which we refer to as SPDinduced synthesis of hybrid materials, is presented. At its core is the creation of inner structure made from various materials within the bulk of a solid. As distinct from the traditional metal forming, SPDinduced synthesis produces an engineered inner architecture of the solid without changing its exterior geometry. The possibilities of the SPD techniques with regard to materials synthesis are demonstrated. Research in this nascent area will open up new avenues for fabrication of advanced hybrid materials, while also posing a number of challenging scientific problems. A particular application discussed concerns the development of hybrid ultrafine-grained materials with enhanced structural ductility.

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High-Energy Cold Plastic Deformation, Diffusion, and Mechanochemical Synthesis

Cited by 24 publications

References 14 publications

Atomic Order and Submicrostructure in Iron Alloys at Megaplastic Deformation

Atomic Order and Submicrostructure in Iron Alloys at Megaplastic Deformation

Modeling Enhanced Diffusion Mass Transfer in Metals during Mechanical Alloying

Synthesis of Hybrid Materials by Severe Plastic Deformation: A New Paradigm of SPD Processing

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