Вестник Нижегородского университета им. Н.И. Лобачевского. Серия: Социальные науки

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Title of Article

HALL-PETCH RELATION FOR NANO- AND MICROCRYSTALLINE METALS PRODUCED BY SEVERE PLASTIC DEFORMATION

Issue	5
Date	2010

Article type	scientific article	UDC	539.4; 669.3
Pages	142-146	Keywords	nano- and microcrystalline materials, severe plastic deformation, yield point stress, macro-elastic limit, grain boundary hardening coefficient, nonequilibrium grain boundaries. grain boundary diffusion

Authors

Nokhrin Aleksey VladimirovichNauchno-issledovatelskiy fiziko-tekhnicheskiy institut Nizhegorodskogo gosudarstvennogo universiteta im. N.I. Lobachevskogo
Chuvildeev Vladimir NikolaevichNauchno-issledovatelskiy fiziko-tekhnicheskiy institut Nizhegorodskogo gosudarstvennogo universiteta im. N.I. Lobachevskogo
Kopylov Vladimir IlichFiziko-tekhnicheskiy institut Natsionalnoy akademii nauk Belarusi, Minsk
Lopatin Yuriy GennadevichNauchno-issledovatelskiy fiziko-tekhnicheskiy institut Nizhegorodskogo gosudarstvennogo universiteta im. N.I. Lobachevskogo
Pirozhnikova Olga EduardovnaNauchno-issledovatelskiy fiziko-tekhnicheskiy institut Nizhegorodskogo gosudarstvennogo universiteta im. N.I. Lobachevskogo, Nizhegorodskiy filial instituta mashinovedeniya im. A.A. Blagonravova RAN
Sakharov Nikita VladimirovichNauchno-issledovatelskiy fiziko-tekhnicheskiy institut Nizhegorodskogo gosudarstvennogo universiteta im. N.I. Lobachevskogo
Piskunov Aleksandr VladimirovichNauchno-issledovatelskiy fiziko-tekhnicheskiy institut Nizhegorodskogo gosudarstvennogo universiteta im. N.I. Lobachevskogo
Kozlova Nataliya AnatolevnaNauchno-issledovatelskiy fiziko-tekhnicheskiy institut Nizhegorodskogo gosudarstvennogo universiteta im. N.I. Lobachevskogo

Abstract

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 nano- and 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.

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