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Improvement of the shape memory effect in Fe-based alloys by training

Nele Van Caenegem, Kim Verbeken UGent, Danny Segers UGent and Yvan Houbaert UGent (2008) STEEL RESEARCH INTERNATIONAL. 79(4). p.314-320
abstract
Shape recovery in iron-based shape memory alloys is known to be incomplete. Thermomechanical cycling or training is recognized to improve the shape memory effect. In the present work, different aspects of training are studied: the number of cycles, the amount of deformation and the annealing temperature. As the number of cycles increases, the epsilon martensite plates become thinner and within the different grains they tend to align in the same direction. Still, different variants are present. XRD measurements showed a strong increase in the E martensite volume from cycle 1 to cycle 2 and a slight decrease for further cycles. There exists an optimum deformation for obtaining stress induced E martensite which is reversibly transformable to austenite during annealing. When the amount of deformation is too low, the fraction of stress induced epsilon martensite is very low, therefore, the shape memory effect is small. If the deformation is too large, slip may occur and different E; martensite variants are formed, which hinders the reverse epsilon ->gamma transformation. The recovery annealing temperature is critical for obtaining a good shape memory, especially during training. The recovery annealing temperature of 400 degrees C is too low for completing the reverse transformation; annealing at 600 degrees C is most commonly used.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
training, shape memory alloy, iron-based, annealing temperature, deformation, TRANSFORMATION
journal title
STEEL RESEARCH INTERNATIONAL
Steel Res. Int.
volume
79
issue
4
pages
314-320 pages
Web of Science type
Article
Web of Science id
000256177900009
JCR category
METALLURGY & METALLURGICAL ENGINEERING
JCR impact factor
0.344 (2008)
JCR rank
40/63 (2008)
JCR quartile
3 (2008)
ISSN
1611-3683
DOI
10.2374/SR107SP130-79-2008-314
language
English
UGent publication?
yes
classification
A1
id
441719
handle
http://hdl.handle.net/1854/LU-441719
date created
2008-11-24 07:48:00
date last changed
2009-07-03 13:34:07
@article{441719,
  abstract     = {Shape recovery in iron-based shape memory alloys is known to be incomplete. Thermomechanical cycling or training is recognized to improve the shape memory effect. In the present work, different aspects of training are studied: the number of cycles, the amount of deformation and the annealing temperature. As the number of cycles increases, the epsilon martensite plates become thinner and within the different grains they tend to align in the same direction. Still, different variants are present. XRD measurements showed a strong increase in the E martensite volume from cycle 1 to cycle 2 and a slight decrease for further cycles. There exists an optimum deformation for obtaining stress induced E martensite which is reversibly transformable to austenite during annealing. When the amount of deformation is too low, the fraction of stress induced epsilon martensite is very low, therefore, the shape memory effect is small. If the deformation is too large, slip may occur and different E; martensite variants are formed, which hinders the reverse epsilon -{\textrangle}gamma transformation. The recovery annealing temperature is critical for obtaining a good shape memory, especially during training. The recovery annealing temperature of 400 degrees C is too low for completing the reverse transformation; annealing at 600 degrees C is most commonly used.},
  author       = {Van Caenegem, Nele and Verbeken, Kim and Segers, Danny and Houbaert, Yvan},
  issn         = {1611-3683},
  journal      = {STEEL RESEARCH INTERNATIONAL},
  keyword      = {training,shape memory alloy,iron-based,annealing temperature,deformation,TRANSFORMATION},
  language     = {eng},
  number       = {4},
  pages        = {314--320},
  title        = {Improvement of the shape memory effect in Fe-based alloys by training},
  url          = {http://dx.doi.org/10.2374/SR107SP130-79-2008-314},
  volume       = {79},
  year         = {2008},
}

Chicago
Van Caenegem, Nele, Kim Verbeken, Danny Segers, and Yvan Houbaert. 2008. “Improvement of the Shape Memory Effect in Fe-based Alloys by Training.” Steel Research International 79 (4): 314–320.
APA
Van Caenegem, Nele, Verbeken, K., Segers, D., & Houbaert, Y. (2008). Improvement of the shape memory effect in Fe-based alloys by training. STEEL RESEARCH INTERNATIONAL, 79(4), 314–320.
Vancouver
1.
Van Caenegem N, Verbeken K, Segers D, Houbaert Y. Improvement of the shape memory effect in Fe-based alloys by training. STEEL RESEARCH INTERNATIONAL. 2008;79(4):314–20.
MLA
Van Caenegem, Nele, Kim Verbeken, Danny Segers, et al. “Improvement of the Shape Memory Effect in Fe-based Alloys by Training.” STEEL RESEARCH INTERNATIONAL 79.4 (2008): 314–320. Print.