On the effect of high-rate strain on diffusion mass transfer in metals

Nechaev, Yu. S.; Vladimirov, S.A.; Olshevskii, N. A.; Khlomov, V. S.

doi:10.1002/pssa.2210940215

Cited by 7 publications

(6 citation statements)

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“…The effect of the intensive mass transfer by HPIB irradiation has been registered earlier in work [4]. A similar effect has also been observed at electron and laser irradiation of solids [5][6][7] and at shock loading of the samples [8,9]. The complete explanation of this phenomenon within the scope of the known diffusion mechanisms…”

supporting

confidence: 68%

“…In this work we have presented the investigation of mass transfer in the field of the fast-moving deformation disturbance of the type of a shock wave, propagating in the infinite lattice with interstitial impurities. The research is motivated by experiments on the exposure of solid to dynamical external loads [1][2][3][4][5][6][7][8][9] For the description of fast hydrodynamical processes the extending of the set of the conventional variables, characterizing the nonequilibrium state of a solid is needed. In the given model the only extra variable is the diffusion flux, the relaxation time of which is assumed to be comparable to the timescale of the process under consideration.…”

Section: Discussionmentioning

confidence: 99%

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Mass transfer in field of fast-moving deformation disturbance

Buchbinder

2003

International Journal of Heat and Mass Transfer

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The mass transfer of interstitial impurities in a crystalline lattice under the influence of the fast-moving deformation disturbance of the type of a shock wave is considered.The velocity of the movement of the disturbance is supposed to be compared with the characteristic velocity of the relaxation of the diffusion flux to its local equilibrium value determined by the Fick's law. The similar situation occurs in a number of experiments on the exposure of a solid to dynamical external loads giving rise to such fast hydrodynamical processes in a sample that the local equilibrium assumption, normally assumed for the macroscopic description of transport processes, is no longer valid. Considering the diffusion flux among the set of independent variables we have derived a set of coupled hydrodynamic equations describing nonequilibrium behavior of a solid in the absence of local equilibrium in the system. Within the scope of the proposed model it has been shown that in comparison with the local equilibrium system an enhanced mass transfer occurs under local nonequilibrium conditions.

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supporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Mass transfer in field of fast-moving deformation disturbance

Buchbinder

2003

International Journal of Heat and Mass Transfer

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“…The subsequent reduction in the coherency between the γ and γ phases causes a drop in the precipitate stability, enhancing Ostwald ripening kinetics [45]. The applied strain also has an effect on the lattice itself, the deformation easing the diffusion of γ -forming elements in the γ matrix, notably via the increase in vacancy density [63][64][65][66][67]. Even though most of the fatigue conditions tested do not activate macro-plasticity, dislocation movements can still be initiated and consequently act as diffusion paths for elements, enabling the "pipe diffusion" mechanism [35,39,41,43,44].…”

Section: Thermomechanical Contribution To Aging Mechanisms?mentioning

confidence: 99%

Aging of γ′ Precipitates at 750 °C in the Nickel-Based Superalloy AD730TM: A Thermally or Thermo-Mechanically Controlled Process?

Mrozowski

Hénaff

Hamon

et al. 2020

Metals

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The microstructural stability during aging at 750 °C of the γ/γ′ nickel-based superalloy AD730TM is investigated in this work. Strain-free aging and aging during fatigue tests are conducted, with a focus on the influence of the strain ratio, the maximum applied strain, and the cycle waveform (with or without dwell). Two classical mechanisms of γ′ precipitates aging are identified at 750 °C: the coarsening of small spherical γ′ precipitates via the thermally-activated Ostwald ripening process and the coalescence of at least two precipitates into one. These mechanisms appeared to be concomitant during aging. It has been demonstrated that the coarsening kinetics of γ′ precipitates can be described by a classical Lifshitz-Slyozow-Wagner (LSW) equation. The introduction of a cyclic strain during aging at 750 °C increases the coarsening kinetics by means of changes in the volume diffusion of γ′-forming elements and of constraint misfit effects. More precisely, it is shown that the higher the maximum applied strain and/or the strain rate, the higher the coarsening rates. Finally, dwell-fatigue promotes the activation of the γ′ coalescence at 750 °C.

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“…Related experimental data on the enhanced diffusion coefficients (D app. ) in deforming (~1-10 2 s -1 ) systems are presented, for instance, in [12][13][14][15].…”

Section: The Apparent Diffusion Coefficients (D App ) In Severely Def...mentioning

confidence: 99%