Martensitic transformation in freestanding and supported Cu–Al–Ni thin films obtained at low deposition temperatures

In order to use the shape memory alloy Cu-Al-Ni in micro-actuators, freestanding thin films with martensitic transformation are required. Here we show that freestanding Cu-Al-Ni thin films with L21 structure, martensitic transformation and shape memory effect can be obtained using iron as a sacrific...

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Bibliographic Details
Published inMaterials letters Vol. 184; pp. 177 - 180
Main Authors Morán, M.J., Condó, A.M., Soldera, F., Sirena, M., Haberkorn, N.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.12.2016
Subjects
CHEMICAL ETCHING
COPPER ALLOYS (40 TO 99.3 CU)
COPPER ALUMINUM ALLOYS
Copper base alloys
DEPOSITION
Electrochemical etching
ETCHING
Iron
MARTENSITIC TRANSFORMATIONS
Microstructure
PHASE TRANSFORMATIONS
Shape memory
Shape memory alloys
Shape memory effect
THIN FILMS
Thin films
Microstructure
Shape memory
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Summary:In order to use the shape memory alloy Cu-Al-Ni in micro-actuators, freestanding thin films with martensitic transformation are required. Here we show that freestanding Cu-Al-Ni thin films with L21 structure, martensitic transformation and shape memory effect can be obtained using iron as a sacrificial layer. The Cu-Al-Ni films with best performance are obtained at deposition temperatures between 533K and 563K. The Fe layer can afterwards be removed selectively by electrochemical etching. •Synthesis of Cu-Al-Ni thin films with martensitic transformation at low deposition temperatures.•Nanograins with austenitic phase are observed by Transmission Electron Microscopy.•A sacrificial buffer layer is used to obtain freestanding films.•Martensitic transformation and shape memory are observed.
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ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2016.08.027