Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 588, Issue -, Pages 337-342Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2013.11.119
Keywords
NiTi; Martensitic transformation; Shape memory alloys; Size effect; In situ transmission electron microscopy; Surface oxidation
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Funding
- Natural Science Foundation of China [51001003, 51231008]
- Beijing Municipal Excellent Talent Foundation [2010D005015000005]
- New Century Talents Project
- Beijing University of Technology
- Beijing Municipal Education Commission [KM201410005033]
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This in situ TEM study investigated the effect of sample thickness on the martensitic transformation of NiTi. The transformation temperature gradually decreased with decreasing sample thickness. No transformation was observed when the thickness was below a critical value. The critical thickness values for the R phase and martensitic transformations were determined to be similar to 22 nm and similar to 50 nm, respectively, for the Ti-50.8 at.%Ni alloy studied. This apparent size effect was attributed to the depletion of Ti in the matrix caused by surface oxidation, as confirmed by oxygen content measurements. These findings demonstrate that natural oxidation and its influence on the transformation temperature must be taken into consideration in the fabrication of micro-electro-mechanical devices using NiTi. (C) 2013 Elsevier B. V. All rights reserved.
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