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Соотношение Холла-Петча в нанои микрокристаллических металлах, полученных методами интенсивного пластического деформирования

Соотношение Холла-Петча в нанои микрокристаллических металлах, полученных методами интенсивного пластического деформирования

Abstract

Описана модель, позволяющая рассчитывать параметры соотношения Холла-Петча (величину коэффициента зернограничного упрочнения К и предел макроупругости) для нанои микрокристаллических (НМК) металлов, полученных методами интенсивного пластического деформирования (ИПД). В основе модели лежит предположение о том, что величина напряжения течения в НМК металлах наряду с обычными вкладами (вкладом решеточных дислокаций, атомов примесей и т.д.) содержит вклад, связанный с напряжениями, создаваемыми распределенными на границах зерен (ГЗ) дефектами, возникающими при ИПД. Получены выражения для расчета параметров соотношения Холла-Петча от степени и скорости предварительной деформации. Показано соответствие результатов теоретических расчетов с экспериментальными данными.

A model is described which makes it possible to calculate the parameters of Hall-Petch relation (the value of grain boundary hardening coefficient K, and the macro-elastic limit sо for nanoand microcrystalline (NMC) metals produced by severe plastic deformation (SPD). The basis for the model is an assumption that the flow stress value in NMC metals has a contribution (alongside with the usual ones from lattice dislocations, impurity atoms, etc.) associated with stresses produced by grain boundary defects arising at SPD. Expressions have been obtained to calculate Hall-Petch relation parameters as dependent on the value and rate of preliminary deformation. Good agreement has been shown between theoretical calculations and experimental data.

Keywords

НАНОИ МИКРОКРИСТАЛЛИЧЕСКИЕ МАТЕРИАЛЫ, ИНТЕНСИВНАЯ ПЛАСТИЧЕСКАЯ ДЕФОРМАЦИЯ, ПРЕДЕЛ ТЕКУЧЕСТИ, ПРЕДЕЛ МАКРОУПРУГОСТИ, КОЭФФИЦИЕНТ ЗЕРНОГРАНИЧНОГО УПРОЧНЕНИЯ, НЕРАВНОВЕСНЫЕ ГРАНИЦЫ ЗЕРЕН, ЗЕРНОГРАНИЧНАЯ ДИФФУЗИЯ, NONEQUILIBRIUM GRAIN BOUNDARIES. GRAIN BOUNDARY DIFFUSION

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
bronze