Počet záznamů: 1
On the multiplication of dislocations during martensitic transformations in NiTi shape memory alloys
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SYSNO ASEP 0354828 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název On the multiplication of dislocations during martensitic transformations in NiTi shape memory alloys Tvůrce(i) Simon, T. (DE)
Kröger, A. (DE)
Somsen, Ch. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Eggeler, G. (DE)Celkový počet autorů 5 Zdroj.dok. Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 58, č. 5 (2010), s. 1850-1860Poč.str. 11 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova NiTi ; Martensitic transformations ; Dislocation multiplication mechanism ; Martensite variants ; Dislocations Vědní obor RIV BM - Fyzika pevných látek a magnetismus CEP GA106/09/1913 GA ČR - Grantová agentura ČR CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000274931200036 DOI 10.1016/j.actamat.2009.11.028 Anotace In situ and post-mortem diffraction contrast transmission electron microscopy (TEM) was used to study the multiplication of dislocations during a thermal martensitic forward and reverse transformation in a NiTi shape memory alloy single crystal. An analysis of the elongated dislocation loops which formed during the transformation was performed. It is proposed that the stress field of an approaching martensite needle activates an in-grown dislocation segment and generates characteristic narrow and elongated dislocation loops which expand on {1 1 0}B2 planes parallel to {0 0 1}B190 compound twin planes. The findings are compared with TEM results reported in the literature for NiTi and other shape memory alloys. It is suggested that the type of dislocation multiplication mechanism documented in the present study is generic and that it can account for the increase in dislocation densities during thermal and stress-induced martensitic transformations in other shape memory alloys. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2011
Počet záznamů: 1