Journal
INTERNATIONAL JOURNAL OF PLASTICITY
Volume 80, Issue -, Pages 1-18Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2015.12.007
Keywords
Phase transformation; Crystal plasticity; Constitutive behaviour; Finite elements; Shape memory alloys
Funding
- National Science Foundation [DMR 0907561]
- DOE Office of Basic Energy Sciences [SC-0001258]
- Ohio Supercomputer Center [PAS0676]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1207494] Funding Source: National Science Foundation
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The coupling between phase transformations and plasticity in shape memory alloys (SMAs) is studied by developing a finite element framework in which the constitutive relation captures both phase transformations at the martensite correspondence variant (CV) scale and rate-dependent crystal plasticity in austenite. Load-free and load-biased thermal cycling simulations involving a model cubic-to-tetragonal transformation system are carried out to study how slip in austenite can affect the resulting martensite microstructure. Three key questions are answered. First, where does austenite slip predominantly occur during phase transformation? Second, at what stage during a thermal cycle is plastic deformation most pronounced? Third, what is the effect of plastic deformation on measurable parameters like transformation temperature and subsequent transformation microstructure? The model can also be generalized to study the coupling between phase transformations, twining, and slip. (C) 2015 Elsevier Ltd. All rights reserved.
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