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Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy
If the shape memory alloy is subjected to the subloop loading under the stress-controlled condition, creep and creep recovery can appear based on the martensitic transformation. In the design of shape memory alloy elements, these deformation properties are important since the deflection of shape mem...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458963/ https://www.ncbi.nlm.nih.gov/pubmed/28817016 http://dx.doi.org/10.3390/ma5050909 |
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author | Takeda, Kohei Tobushi, Hisaaki Pieczyska, Elzbieta A. |
author_facet | Takeda, Kohei Tobushi, Hisaaki Pieczyska, Elzbieta A. |
author_sort | Takeda, Kohei |
collection | PubMed |
description | If the shape memory alloy is subjected to the subloop loading under the stress-controlled condition, creep and creep recovery can appear based on the martensitic transformation. In the design of shape memory alloy elements, these deformation properties are important since the deflection of shape memory alloy elements can change under constant stress. The conditions for the progress of the martensitic transformation are discussed based on the kinetics of the martensitic transformation for the shape memory alloy. During loading under constant stress rate, temperature increases due to the stress-induced martensitic transformation. If stress is held constant during the martensitic transformation stage in the loading process, temperature decreases and the condition for the progress of the martensitic transformation is satisfied, resulting in the transformation-induced creep deformation. If stress is held constant during the reverse transformation stage in the unloading process, creep recovery appears due to the reverse transformation. The details for these thermomechanical properties are investigated experimentally for TiNi shape memory alloy, which is most widely used in practical applications. The volume fraction of the martensitic phase increases in proportion to an increase in creep strain. |
format | Online Article Text |
id | pubmed-5458963 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-54589632017-07-28 Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy Takeda, Kohei Tobushi, Hisaaki Pieczyska, Elzbieta A. Materials (Basel) Article If the shape memory alloy is subjected to the subloop loading under the stress-controlled condition, creep and creep recovery can appear based on the martensitic transformation. In the design of shape memory alloy elements, these deformation properties are important since the deflection of shape memory alloy elements can change under constant stress. The conditions for the progress of the martensitic transformation are discussed based on the kinetics of the martensitic transformation for the shape memory alloy. During loading under constant stress rate, temperature increases due to the stress-induced martensitic transformation. If stress is held constant during the martensitic transformation stage in the loading process, temperature decreases and the condition for the progress of the martensitic transformation is satisfied, resulting in the transformation-induced creep deformation. If stress is held constant during the reverse transformation stage in the unloading process, creep recovery appears due to the reverse transformation. The details for these thermomechanical properties are investigated experimentally for TiNi shape memory alloy, which is most widely used in practical applications. The volume fraction of the martensitic phase increases in proportion to an increase in creep strain. MDPI 2012-05-22 /pmc/articles/PMC5458963/ /pubmed/28817016 http://dx.doi.org/10.3390/ma5050909 Text en © 2012 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Article Takeda, Kohei Tobushi, Hisaaki Pieczyska, Elzbieta A. Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy |
title | Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy |
title_full | Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy |
title_fullStr | Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy |
title_full_unstemmed | Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy |
title_short | Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy |
title_sort | transformation-induced creep and creep recovery of shape memory alloy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458963/ https://www.ncbi.nlm.nih.gov/pubmed/28817016 http://dx.doi.org/10.3390/ma5050909 |
work_keys_str_mv | AT takedakohei transformationinducedcreepandcreeprecoveryofshapememoryalloy AT tobushihisaaki transformationinducedcreepandcreeprecoveryofshapememoryalloy AT pieczyskaelzbietaa transformationinducedcreepandcreeprecoveryofshapememoryalloy |