Number of the records: 1

Ni4Ti3 precipitate structures in Ni-rich NiTi shape memory alloys

SYSNO ASEP	0324849
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Ni4Ti3 precipitate structures in Ni-rich NiTi shape memory alloys
Title	Precipitační struktury fáze Ni4Ti3 v Ni-bohatých slitinách NiTi s tvarovou pamětí
Author(s)	Holec, David (UFM-A) Bojda, Ondřej (UFM-A) Dlouhý, Antonín (UFM-A)_{RID, ORCID}
Source Title	Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. - : Elsevier - ISSN 0921-5093 Roč. 481, Sp. Iss. (2008), s. 462-465
Number of pages	4 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	NiTi shape memory alloys ; Ni4Ti3 precipitates ; Multi-step martensitic transformations
Subject RIV	BM - Solid Matter Physics ; Magnetism
R&D Projects	GA106/05/0918 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z20410507 - UFM-A (2005-2011)
UT WOS	000255716100095
DOI	10.1016/j.msea.2006.11.182
Annotation	Non-uniform distributions of Ni4Ti3 precipitate crystallographic variants are investigated in a Ni-rich NiTi shape memory alloy after aging, assisted by external stress. A finite-element method model is presented that considers the elastic anisotropy of the B2 parent phase and also mutual misorientations of grains in a polycrystalline sample. On loading by the external stress, the stress is redistributed in the microstructure and the precipitation of some Ni4Ti3 crystallographic variants becomes distinctly favorable in grain boundary regions since these variant configurations minimize the elastic interaction energy. The volume fraction of the affected grain boundary regions is calculated and the numerical results are compared with the data obtained by differential scanning calorimetry and transmission electron microscopy.
Workplace	Institute of Physics of Materials
Contact	Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485
Year of Publishing	2009

Number of the records: 1