Artículo
Structures in textured Cu-Al-Ni shape memory thin films grown by sputtering
Espinoza Torres, Carlos Aurelio
; Condo, Adriana Maria
; Haberkorn, Nestor Fabian
; Zelaya, Maria Eugenia
; Schryvers. D.; Guimpel, Julio Juan
; Lovey, Francisco Carlos
Fecha de publicación:
08/2014
Editorial:
Elsevier Inc
Revista:
Materials Characterization
ISSN:
1044-5803
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The structure and texture formation in Cu–Al–Ni thin films of different thicknesses (1 μm to 5 μm) grown by DC magnetron sputtering without any intentional heating of the substrate are reported. The as-grown films present grains with an average size of 20 nm. The films with thickness of 1 μm have a single metastable phase with a hexagonal structure and are textured with planes (0002) parallel to the plane of the films. It was observed that thicker films present phase coexistence between metastable hexagonal and body centered cubic structures with a gradual increment of the body centered cubic phase fraction. The films with thickness of 5 μm are textured with planes (0002) and 1010 n o in the hexagonal structure, whereas in the body centered cubic structure the films are textured with {110} planes parallel to the plane of the films. This fact can be associated with selfheating of the substrate during the growth of the films and with the relative stability of the metastable phases. Free standing films annealed in a second step (1123 K for 1 h) present austenitic phase with L21 structure and sub-micrometric grains textured with {220}L21 planes parallel to the plane of the films. The martensitic transformation temperature was determined from the analysis of resistance against temperature measurements.
Palabras clave:
Thin Film
,
Shape Memory
,
Cu-Al-Ni
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Articulos(CCT - PATAGONIA NORTE)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - PATAGONIA NORTE
Citación
Lovey, Francisco Carlos; Zelaya, Maria Eugenia; Condo, Adriana Maria; Espinoza Torres, Carlos Aurelio; Haberkorn, Nestor Fabian; Guimpel, Julio Juan; et al.; Structures in textured Cu-Al-Ni shape memory thin films grown by sputtering; Elsevier Inc; Materials Characterization; 96; 8-2014; 256-262
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