Intermittent ‘self-locking’ of grain growth in fine-grained materials

Estrin, Yuri; Gottstein, Günter; Shvindlerman, L.S.

doi:10.1016/s1359-6462(99)00167-0

Cited by 44 publications

(21 citation statements)

References 11 publications

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“…[9], we start our consideration by looking at the grain boundary migration as a main mechanism of grain growth. The process is driven by the tendency of the system of grain boundaries to reduce the total grain boundary area.…”

Section: Grain Growth In ®Ne-grained Materialsmentioning

confidence: 99%

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Thermodynamic effects on the kinetics of vacancy-generating processes

1999

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AbstractÐThe inhibiting e ect of vacancies on the very process in which they are generated is considered from a thermodynamic viewpoint. Examples of such processes treated here in some detail are grain growth and pore dissolution. It is shown that these processes are inhibited due to vacancy generation. A particular scenario discussed implies intermittent``locking''. After a period of uninhibited kinetics the process comes to a halt due to a thermodynamic back force``locking'' it. It can only re-start once the vacancies produced are removed by di usion. This repetitive cycle leads to an overall reduction in the rate of the kinetic process in question. Speci®c predictions with regard to grain growth in ®ne-grained (particularly nanocrystalline) materials and void dissolution kinetics in sintering are made. A third example considered is vacancy drag on a moving individual grain boundary. The magnitude of the drag is re-assessed by taking into account the Gibbs free energy of the vacancies generated. #

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Section: Grain Growth In ®Ne-grained Materialsmentioning

confidence: 99%

“…equation (9). The di erence is that the vacancy concentration at sinks has been assumed to be zero implying sinks of in®nite strength.…”

Section: Kinetics Of Void Dissolutionmentioning

confidence: 99%

Thermodynamic effects on the kinetics of vacancy-generating processes

1999

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“…(3). This demonstrates that the approximation [1,2] based on the intermittent locking-unlocking scheme with smoothing, provides a quantitatively adequate representation of continuous grain growth in the regime where the inhibiting effect of grain growth induced vacancies is operative. Indeed, Fig.…”

Section: Continuous Growth Modelmentioning

confidence: 80%

“…In recent papers [1,2] we investigated the inhibiting effect of vacancy generation on grain growth. It was shown that vacancies produced as a result of the reduction of the grain boundary (GB) area, i.e.…”

Section: Introductionmentioning

confidence: 99%

On the kinetics of grain growth inhibited by vacancy generation

et al. 2000

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“…Impurities and inhomogeneities can strongly alter the mechanical behaviour and especially the thermal stability [3]. The enhanced resistance to grain growth is associated to compositional parameters as well as to microstructural inhomogeneities as vacancies [4]. NC *Corresponding author.…”

Section: Introductionmentioning

confidence: 99%