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Direct transmission electron microscopy observations of martensitic transformations in Ni-rich NiTi single crystals during in situ cooling and straining
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SYSNO ASEP 0324851 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Direct transmission electron microscopy observations of martensitic transformations in Ni-rich NiTi single crystals during in situ cooling and straining Title Přímá pozorování martenzitických transformací metodou transmisní elektronové mikroskopie Ni-bohatých monokrystalů NiTi během in-situ chlazení a deformace Author(s) Kröger, A. (DE)
Dziaszyk, S. (DE)
Frenzel, J. (DE)
Somsen, Ch. (DE)
Dlouhý, Antonín (UFM-A) RID, ORCID
Eggeler, G. (DE)Source Title Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093
Roč. 481, Sp. Iss. (2008), s. 452-456Number of pages 5 s. Action ESOMAT 2006 Event date 10.09.2006-15.09.2006 VEvent location Bochum Country DE - Germany Event type EUR Language eng - English Country CH - Switzerland Keywords In situ TEM ; NiTi single crystal ; Martensitic transformations Subject RIV BM - Solid Matter Physics ; Magnetism CEZ AV0Z20410507 - UFM-A (2005-2011) UT WOS 000255716100093 DOI 10.1016/j.msea.2007.02.169 Annotation We investigate martensitic transformations using transmission electron microscopy (TEM) in compression aged Ni-rich NiTi single crystals with one family of Ni4Ti3 precipitates. Differential scanning calorimetry (DSC) investigations show that a threestep martensitic transformation (three DSC peaks on cooling from the high temperature regime) can be observed for aging times of 4 ks. In situ cooling TEM investigations reveal that the first peak on cooling is associated with a transformation from B2 to R-phase, starting from all precipitate/matrix interfaces. On further cooling, the B19'-phase appears and grows along precipitate/matrix interfaces (second step). With further decreasing temperature, the remaining R-phase between the precipitates transforms to B19' (third peak). In situ TEM straining experiments of B2 above the martensitic start temperature reveal that first some microstructural regions directly transform in microscopic burst like events from B2 to B19'. Workplace Institute of Physics of Materials Contact Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Year of Publishing 2009
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