A model for direct and inverse Hall-Petch relation for nanocrystalline ceramics

Alexander G. Sheinerman, Ricardo H.R. Castro, Mikhail Yu. Gutkin

Результат исследований: Научные публикации в периодических изданияхстатья

Выдержка

A model describing both direct and inverse Hall-Petch dependences observed in nanocrystalline ceramic MgAl2O4 spinel is proposed. Within the model, plastic deformation in nanocrystalline ceramics (NCCs) is realized via lattice dislocation slip combined with thermally activated grain boundary (GB) sliding. The model strongly suggests that the controlling parameter determining the type (direct or inverse) of the Hall-Petch dependence is the GB sliding activation energy. It is assumed that this quantity can be affected by the temperature regime of NCC synthesis and therefore rationalize conflicting data reported in the literature concerning the onset of the inverse Hall-Petch behavior in this system.

Язык оригиналаанглийский
Номер статьи126886
ЖурналMaterials Letters
Том260
Ранняя дата в режиме онлайн28 окт 2019
DOI
СостояниеЭлектронная публикация перед печатью - 28 окт 2019

Отпечаток

Grain boundary sliding
ceramics
sliding
grain boundaries
plastic deformation
spinel
Plastic deformation
slip
Activation energy
activation energy
synthesis
Temperature
temperature
spinell

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A model for direct and inverse Hall-Petch relation for nanocrystalline ceramics. / Sheinerman, Alexander G.; Castro, Ricardo H.R.; Gutkin, Mikhail Yu.

В: Materials Letters, Том 260, 126886, 01.02.2020.

Результат исследований: Научные публикации в периодических изданияхстатья

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T1 - A model for direct and inverse Hall-Petch relation for nanocrystalline ceramics

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AU - Castro, Ricardo H.R.

AU - Gutkin, Mikhail Yu.

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AB - A model describing both direct and inverse Hall-Petch dependences observed in nanocrystalline ceramic MgAl2O4 spinel is proposed. Within the model, plastic deformation in nanocrystalline ceramics (NCCs) is realized via lattice dislocation slip combined with thermally activated grain boundary (GB) sliding. The model strongly suggests that the controlling parameter determining the type (direct or inverse) of the Hall-Petch dependence is the GB sliding activation energy. It is assumed that this quantity can be affected by the temperature regime of NCC synthesis and therefore rationalize conflicting data reported in the literature concerning the onset of the inverse Hall-Petch behavior in this system.

KW - Ceramics

KW - Hall-Petch effect

KW - Hardness

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