Title
Optimization of a FIB/SEM slice-and-view study of the 3D distribution of <tex>$Ni_{4}Ti_{3}$</tex> precipitates in NiTi Optimization of a FIB/SEM slice-and-view study of the 3D distribution of <tex>$Ni_{4}Ti_{3}$</tex> precipitates in NiTi
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Oxford ,
Subject
Physics
Source (journal)
Journal of microscopy. - Oxford
Volume/pages
233(2009) :1 , p. 61-68
ISSN
0022-2720
ISI
000262511900008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The 3D morphology and distribution of lenticular Ni4Ti3 precipitates in the austenitic B2 matrix of a binary Ni51Ti49 alloy has been investigated by a slice-and-view procedure in a dual-beam focused ion beam/scanning electron microscope system. Due to the weak contrast of the precipitates, proper imaging conditions need to be selected first to allow for semi-automated image treatment. Knowledgeable imaging is further needed to ensure that all variants of the precipitates are observed with equal probability, regardless of sample orientation. Finally, a volume ratio of 10.2% for the Ni4Ti3 precipitates could be calculated, summed over all variants, which yields a net composition of Ni50.27Ti49.73 for the matrix, leading to an increase of 125 degrees for the martensitic start temperature. Also, the expected relative orientation of the different variants of the precipitates could be confirmed.
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