Journal
MATERIALS LETTERS
Volume 214, Issue -, Pages 53-55Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2017.11.069
Keywords
Size effect; Shape memory alloys; Martensitic phase transformation; FIB; Nanoindentation
Funding
- Hong Kong Research Grant Council [N_HKUST 617/14]
- National Natural Science Foundation of China [11532010, 51501087]
- Fundamental Research Program of Shenzhen [JCYJ20170307110418960, JCYJ20170412153039309]
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Polycrystalline NiTi pillars of 0.5 mu m diameter and 1.5 mu m height with average grain sizes from 10 to 421 nm are fabricated by focused ion beam and compressed by nanoindentation. It is found that stress-strain hysteresis loop area, transformation stress and transformation strain vary non-monotonically with grain size. Analysis of the results reveals that increasing the grain size from 10 nm enhances the transformation by promoting the nucleation and growth of martensite domains. When the grain size approaches the pillar size, the transformation is suppressed by an increase in granular constraints and heterogeneity of internal stress-strain state among large grains. (C) 2017 Elsevier B.V. All rights reserved.
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