Shape memory properties of Cu-based thin tapes obtained by rapid solidification methods

• Autores: Malarria, Jorge Alberto; Elgoyhen, C.; Vermaut, Ph.; Ochin, P.; Portier, R.
• Año de publicación: 2006
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: SHAPE MEMORY ALLOYS; RAPID SOLIDIFICATION; Cu-Al-Ni
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Two different rapid solidification techniques were utilized to produce thin tapes of Cu–13Al–xNi–1Ti (wt.%, with x = 5, 5.5, 6) shape memory alloys directly from the melt. Both melt-spinning and twin-roll casting (quenching between the gap of two rollers) have resulted successful methods to obtain ribbons (8 mm width, 55 m thickness) and strips (29–30 mm width, 450 m thickness) with grain sizes below 2 m, after optimization of the processing parameters. Although as a consequence of the rapid solidification the martensitic transformation temperatures are depressed, after annealing at 700 ◦C the high transition temperatures of the alloys in the bulk form are re-established. Measuring of length change under uniaxial tensile load shows elongations up to 1.8% (at 90 MPa) on cooling through the martensitic transformation.
Fil: Malarria, Jorge Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Física de Rosario. Universidad Nacional de Rosario. Instituto de Física de Rosario; Argentina
Fil: Elgoyhen, C.. Ecole Nationale Sup´erieure de Chimie de Paris; Francia
Fil: Vermaut, Ph.. Ecole Nationale Sup´erieure de Chimie de Paris; Francia
Fil: Ochin, P.. Centre National de la Recherche Scientifique; Francia
Fil: Portier, R.. Ecole Nationale Sup´erieure de Chimie de Paris; Francia