Nonequilibrium Evolution Thermodynamics of Vacancies

Метлов, Л. С.

doi:10.1103/physrevlett.106.165506

Cited by 29 publications

(36 citation statements)

References 27 publications

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“…As pointed out recently, the generation and motion of structural defects in a solid under severe external action is a complicated process, whose theory is still in its infancy. 11,12 In the following, vacancies are shown to be located in the C-B-C chains and to be boron vacancies only, C-V-C (Fig. 1).…”

Section: Introductionmentioning

confidence: 86%

Mechanical properties of icosahedral boron carbide explained from first principles

et al. 2011

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International audienceAn exhaustive study of the neutral structural defects of icosahedral B4C has been performed with the density functional theory. Vacancies have been determined to be boron vacancies in the C-B-C chains. Their presence is shown to yield a discontinuous variation of crystal volume upon increasing pressure, when the formation of a C-C bond occurs in the chains. The dynamical failure of shocked B4C is attributed to the formation of these C-C bonds

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Section: Introductionmentioning

confidence: 86%

Mechanical properties of icosahedral boron carbide explained from first principles

et al. 2011

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“…To describe such oscillation transitions using non equilibrium evolution thermodynamics [12,13], we proposed a certain type of evolution equations with inertia (or memory). To a first approximation, such a model can be applied to describe the phenomena related to the periodicity of deformation fragmenta tion and recrystallization of grains.…”

Section: Evolution Equations With Allowance For Inertiamentioning

confidence: 99%

Cyclic character of the evolution of the defect structure and the properties of metallic materials during megaplastic deformation

2015

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The principle of nonequilibrium evolution thermodynamics is applied to describe the cyclic evo lution of the defect structures in metallic materials subjected to megaplastic (severe) plastic deformation. A unimodal distribution of defects over deformation induced dislocations and the grain boundaries that appear during dynamic recrystallization is considered as an initial model. It is shown that taking into account mem ory (inertia) effects during deformation induced restructuring transforms basic relations to the form charac teristic of wave equations with damping. In this case, a deformed system executes damped oscillations and gradually reaches stationary structural parameters.

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“…By E π = 0, one indicated natural (nano)colloid-type matter aggregation with absence of an external force field [6], whereas with E π < 0 (hypo-pressure or depressurization effect) one is going to land on fairly coarse-grained material [3,12]. In external shock-pressure conditions nonequilibrium theory of vacancies, addressing the melting phenomenon in terms of (dis)continuous phase transition phenomenological rationale of Landau type, has recently been proposed [22,23].…”

Section: Smoluchowski Dynamics With Hall-petch-griffith Fingerprintmentioning

confidence: 99%

A Method of Mechanical Control of Structure-property Relationship in Grains-containing Material Systems

Kruszewska¹,

Weber²,

Gadomski³

et al. 2013

Acta Phys. Pol. B

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Material systems can grow indefinitely large unless there appear some physical restrictions superimposed on them. At first approximation, they can be restricted in their evolution by means of an external mechanical factor such as pressure. If the material system's evolution can be described by a Smoluchowski type equation in the phase space of grain sizes, the average grain size magnitude can be suitably controlled by such mechanical factor. Both magnitude and direction of the factor can render the grain sizes either bigger or smaller than the one expected without any influence of the factor. We propose to embody the mechanical factor in the drift term of the corresponding Smoluchowski equation, in general, derivable from the entropy production principle. Such an embodiment allows one to modify controllably (over certain distinguished time scales of the process) the grain sizes, thus, the mechanically affected material properties such as superplasticity or superconductivity. A simple econophysical example, addressing investment strategies upon random-market tensions, is added to support the overall rationale of the method thus developed.

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Nonequilibrium Evolution Thermodynamics of Vacancies

Cited by 29 publications

References 27 publications

Mechanical properties of icosahedral boron carbide explained from first principles

Mechanical properties of icosahedral boron carbide explained from first principles

Cyclic character of the evolution of the defect structure and the properties of metallic materials during megaplastic deformation

A Method of Mechanical Control of Structure-property Relationship in Grains-containing Material Systems

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