Počet záznamů: 1
Deformation mechanisms of nanograined metallic polycrystals
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SYSNO ASEP 0358270 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Deformation mechanisms of nanograined metallic polycrystals Tvůrce(i) Saada, G. (FR)
Kruml, Tomáš (UFM-A) RID, ORCIDCelkový počet autorů 2 Zdroj.dok. Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 59, - (2011), s. 2565-2574Poč.str. 10 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova nanocrystalline materials ; grain boundary defects ; plastic deformation Vědní obor RIV JJ - Ostatní materiály CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000289131100001 DOI 10.1016/j.actamat.2010.12.035 Anotace This paper is an attempt to discuss the relevance of the physical concepts used to describe the plastic flow behaviour of a wide class of nanograined metallic polycrystals, by critically analyzing recent experimental observations on nanograined Ni and Cu. The paper focuses on the description of the elastic–plastic transition, and of the strain rate sensitivity. Using the generally accepted assumption that plastic flow results from dislocation nucleation at grain boundaries, it is shown that two deformation regimes must be distinguished: a nucleation- controlled mechanism at low strain rates, and a combined nucleation and propagation mechanism at high strain rates. At low deformation rates, the average nucleation rate is determined either from knowledge of the stress–strain curve, or from analysis of creep or relaxation kinetics. The strain rate sensitivity is shown to be related to the effect of stress on the nucleation rate. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2012
Počet záznamů: 1