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Reproducibility of martensitic transformation and phase constitution in Ni-Co-Al

Scheerbaum, Nils and Kraus, R. and Liu, J. and Skrotzki, W. and Schultz, L. and Gutfleisch, O. (2012):
Reproducibility of martensitic transformation and phase constitution in Ni-Co-Al.
In: Intermetallics, Elsevier Science Publishing Company, pp. 55-62, 20, (1), ISSN 09669795, [Article]

Abstract

Ni-Co-Al is a potential thermal and magnetic shape-memory alloy due to its high martensitic transformation (MT) temperature and good ductility. The mechanical and thermal pre-treatment of samples are shown to be crucial for a reproducible adjustment of MT. Crushing, which involves plastic deformation, suppresses MT fully. Annealing can partly restore MT, however generally, MT temperatures, crystal structure and phase constitution of the initial bulk material cannot fully be restored. MT temperatures are constant and reproducible, when keeping sample temperature below 150 degrees C, short time annealing at 300 degrees C changes MT temperatures drastically (10-40 K). A guideline is given to obtain reproducibly the desired MT and phase constitution in Ni-Co-Al. The MT temperature and phase constitution are investigated for several different alloy compositions (Ni(35.2)Co(37.8)Al(27.0); Ni(32.5+x)Co(39.5-x) Al(28.0); Ni(33.5+x)Co(39.5-x)Al(27.0); x = 0, 0.5, 1, 1.5, 2; at.%) and sample treatments. High MT temperatures around 100 C can be obtained.

Item Type: Article
Erschienen: 2012
Creators: Scheerbaum, Nils and Kraus, R. and Liu, J. and Skrotzki, W. and Schultz, L. and Gutfleisch, O.
Title: Reproducibility of martensitic transformation and phase constitution in Ni-Co-Al
Language: English
Abstract:

Ni-Co-Al is a potential thermal and magnetic shape-memory alloy due to its high martensitic transformation (MT) temperature and good ductility. The mechanical and thermal pre-treatment of samples are shown to be crucial for a reproducible adjustment of MT. Crushing, which involves plastic deformation, suppresses MT fully. Annealing can partly restore MT, however generally, MT temperatures, crystal structure and phase constitution of the initial bulk material cannot fully be restored. MT temperatures are constant and reproducible, when keeping sample temperature below 150 degrees C, short time annealing at 300 degrees C changes MT temperatures drastically (10-40 K). A guideline is given to obtain reproducibly the desired MT and phase constitution in Ni-Co-Al. The MT temperature and phase constitution are investigated for several different alloy compositions (Ni(35.2)Co(37.8)Al(27.0); Ni(32.5+x)Co(39.5-x) Al(28.0); Ni(33.5+x)Co(39.5-x)Al(27.0); x = 0, 0.5, 1, 1.5, 2; at.%) and sample treatments. High MT temperatures around 100 C can be obtained.

Journal or Publication Title: Intermetallics
Volume: 20
Number: 1
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: martensitic transformations, precipitates, shape-memory effects (including superelasticity), thermomechanical treatment, microstructure
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 26 May 2014 11:49
Funders: Plansee SE (Reutte, Austria) , Deutsche Forschungsgemeinschaft SPP1239
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