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Shape Memory and Superelasticity
Published in: Shape Memory and Superelasticity 4/2016

01-12-2016 | SPECIAL ISSUE: ADVANCES IN EXPERIMENTATION AT MULTIPLE LENGTH SCALES IN SHAPE MEMORY ALLOYS, INVITED PAPER

Microscale Repeatability of the Shape-Memory Effect in Fine NiTi Wires

Authors: Joyce Yue Gong, Samantha H. Daly

Published in: Shape Memory and Superelasticity | Issue 4/2016

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Abstract

An experimental investigation into microscale transformation characteristics of polycrystalline NiTi wires of 500 µm diameter during shape memory cycling is discussed, with emphasis on the characterization of a pronounced heterogeneity in the strain distribution evident during detwinning of the martensite phase upon application of load and its persistence throughout the actuation cycle. Using scanning electron microscopy-digital image correlation, full-field strain maps at the microscale were obtained during shape memory cycling. It was found that the strains induced by detwinning were quite heterogeneous at the microscale, and could display a large degree of similarity with thermo-mechanical cycling that tended to increase as cycling progressed. Residual strain concentrated at locations where strain accumulation from detwinning and plasticity were significant, indicating that martensitic detwinning and the associated plasticity that occurs with it is spatially correlated to the subsequent accumulation of residual strain at the microscale.
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Metadata
Title
Microscale Repeatability of the Shape-Memory Effect in Fine NiTi Wires
Authors
Joyce Yue Gong
Samantha H. Daly
Publication date
01-12-2016
Publisher
Springer International Publishing
Published in
Shape Memory and Superelasticity / Issue 4/2016
Print ISSN: 2199-384X
Electronic ISSN: 2199-3858
DOI
https://doi.org/10.1007/s40830-016-0081-0

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