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Evolution of martensitic transformation in Cu–Al–Ni shape memory alloys during low-temperature aging

Published online by Cambridge University Press:  31 January 2011

V. Recarte ,
R. B. Pérez-Sáez ,
M. L. Nó  and
J. San Juan
V. Recarte
Affiliation:
Departamento Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Aptdo. 644–48080 Bilbao, Spain
R. B. Pérez-Sáez
Affiliation:
Departamento Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Aptdo. 644–48080 Bilbao, Spain
M. L. Nó
Affiliation:
Departamento Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Aptdo. 644-48080 Bilbao, Spain
J. San Juan
Affiliation:
Departamento Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Aptdo. 644-48080 Bilbao, Spain
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Abstract

The effect of thermal aging at 473 K on martensitic transformation characteristics have been studied in the Cu–Al–Ni shape memory alloys. An increase of martensitic transformation temperatures as a result of aging has been observed. Furthermore, the martensitic transformation shows an evolution with aging time from a single β3 ⇒ β′3 structural transformation to a β3 ⇒ γ′3 + β′3 transformation. Using internal friction and thermoelectric power measurements, as well as specific thermal treatments, it has been determined that the mechanism responsible for this evolution is an increase in the degree of order, thus rejecting the participation of a γ1 precipitation process. Finally, the increase of order at the next nearest neighbors has been established as the main factor responsible of the evolution of the martensitic transformation characteristics.

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Articles
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Journal of Materials Research , Volume 14 , Issue 7 , July 1999 , pp. 2806 - 2813
Copyright
Copyright © Materials Research Society 1999

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