Mohri, Maryam ; Nili-Ahmadabadi, Mahmoud ; PouryazdanPanah, Mohsen ; Hahn, Horst (2016)
Evaluation of structure and mechanical properties of Ni-rich NiTi/Kapton composite film.
In: Materials Science and Engineering: A, 668
doi: 10.1016/j.msea.2016.05.044
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
NiTi thin films are usually sputtered on silicon wafers by magnetron sputtering. But the systems composed of thin film on flexible polymeric substrate are used in many applications such as micro electromechanical systems (MEMS). Investigation on mechanical properties of thin films has attracted much attention due to their widespread applications. In this paper, the mechanical properties of 1 mu m-thick crystallized Ni-49.2 at%Ti thin film alloy deposited by DC magnetron sputtering on Kapton substrate are investigated by using tensile test. The as-deposited thin films are in amorphous state, then for crystallization, the thin film was annealed at 450 degrees C for 30 min. Formation of the austenite phase after annealing was confirmed by X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The surface morphology of as deposited and crystallized thin films were examined by scanning electron microscopy (SEM). Stress-strain curves of the NiTi alloy thin film were obtained by subtracting of the stress-strain Kapton curves from the corresponding curves of the NiTi/Kapton composite. The XRD results revealed that the NiTi thin film deposited on the Kapton is austenitic and presents super-elastic effect at room temperature. This pseudo elastic effect leads to more recoverable strain in NiTi/Kapton composite film compared with Kapton foils on loading/unloading test. Furthermore, it was concluded that nanostructure of the NiTi thin film is responsible for remarkable improvement of ultimate tensile strength (1.4 GPa) at a strain of 30% compared with the bulk material. (C) 2016 Elsevier B.V. All rights reserved.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Mohri, Maryam ; Nili-Ahmadabadi, Mahmoud ; PouryazdanPanah, Mohsen ; Hahn, Horst |
| Art des Eintrags: | Bibliographie |
| Titel: | Evaluation of structure and mechanical properties of Ni-rich NiTi/Kapton composite film |
| Sprache: | Englisch |
| Publikationsjahr: | 21 Juni 2016 |
| Verlag: | Elsevier Science SA, Switzerland |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Materials Science and Engineering: A |
| Jahrgang/Volume einer Zeitschrift: | 668 |
| DOI: | 10.1016/j.msea.2016.05.044 |
| Kurzbeschreibung (Abstract): | NiTi thin films are usually sputtered on silicon wafers by magnetron sputtering. But the systems composed of thin film on flexible polymeric substrate are used in many applications such as micro electromechanical systems (MEMS). Investigation on mechanical properties of thin films has attracted much attention due to their widespread applications. In this paper, the mechanical properties of 1 mu m-thick crystallized Ni-49.2 at%Ti thin film alloy deposited by DC magnetron sputtering on Kapton substrate are investigated by using tensile test. The as-deposited thin films are in amorphous state, then for crystallization, the thin film was annealed at 450 degrees C for 30 min. Formation of the austenite phase after annealing was confirmed by X-ray diffractometry (XRD) and differential scanning calorimetry (DSC). The surface morphology of as deposited and crystallized thin films were examined by scanning electron microscopy (SEM). Stress-strain curves of the NiTi alloy thin film were obtained by subtracting of the stress-strain Kapton curves from the corresponding curves of the NiTi/Kapton composite. The XRD results revealed that the NiTi thin film deposited on the Kapton is austenitic and presents super-elastic effect at room temperature. This pseudo elastic effect leads to more recoverable strain in NiTi/Kapton composite film compared with Kapton foils on loading/unloading test. Furthermore, it was concluded that nanostructure of the NiTi thin film is responsible for remarkable improvement of ultimate tensile strength (1.4 GPa) at a strain of 30% compared with the bulk material. (C) 2016 Elsevier B.V. All rights reserved. |
| Freie Schlagworte: | NiTi/Kapton Composite, Thin film, Pseudo elastic effect, Tensile test |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 26 Jul 2017 09:29 |
| Letzte Änderung: | 26 Jul 2017 09:29 |
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