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...
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doaj-5dd8b0ea15c74d4ca5f36047342678f42020-11-24T21:48:41ZengMDPI AGMaterials1996-19442012-05-015590992110.3390/ma5050909Transformation-Induced Creep and Creep Recovery of Shape Memory AlloyElzbieta A. PieczyskaHisaaki TobushiKohei TakedaIf 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.http://www.mdpi.com/1996-1944/5/5/909shape memory alloysuperelasticitysublooptransformation bandcreepcreep recoverylocal deformation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Elzbieta A. Pieczyska Hisaaki Tobushi Kohei Takeda |
spellingShingle |
Elzbieta A. Pieczyska Hisaaki Tobushi Kohei Takeda Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy Materials shape memory alloy superelasticity subloop transformation band creep creep recovery local deformation |
author_facet |
Elzbieta A. Pieczyska Hisaaki Tobushi Kohei Takeda |
author_sort |
Elzbieta A. Pieczyska |
title |
Transformation-Induced Creep and Creep Recovery of Shape Memory Alloy |
title_short |
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_sort |
transformation-induced creep and creep recovery of shape memory alloy |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2012-05-01 |
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. |
topic |
shape memory alloy superelasticity subloop transformation band creep creep recovery local deformation |
url |
http://www.mdpi.com/1996-1944/5/5/909 |
work_keys_str_mv |
AT elzbietaapieczyska transformationinducedcreepandcreeprecoveryofshapememoryalloy AT hisaakitobushi transformationinducedcreepandcreeprecoveryofshapememoryalloy AT koheitakeda transformationinducedcreepandcreeprecoveryofshapememoryalloy |
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1725890894216822784 |