Journal
ACTA MATERIALIA
Volume 57, Issue 19, Pages 5892-5897Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.08.015
Keywords
Shape memory alloys (SMA); Martensitic phase transformation; Infrared thermography; Fracture; Tension test
Funding
- DFG [EG101/10-2]
- Helmholtz Association [VH-VI-102]
- Alexander von Humboldt Foundation
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Crack loading and crack extension in pseudoelastic binary NiTi shape memory alloy (SMA) miniature compact tension (CT) specimens with 50.7 at.% Ni (austenitic, pseudoelastic) was investigated using infrared (IR) thermography during in situ loading and unloading. IR thermographic measurements allow for the observation of heat effects associated with the stress-induced transformation of martensite from B2 to BIT during loading and the reverse transformation during unloading. The results are compared with optical images and discussed in terms of the crack growth mechanisms in pseudoelastic NiTi SMAs. Direct experimental evidence is presented which shows that crack growth occurs into a stress-induced martensitic microstructure, which immediately retransforms to austenite in the wake of the crack. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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