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Thermal cycling effects in high temperature Cu–Al–Ni–Mn–B shape memory alloys

Published online by Cambridge University Press:  31 January 2011

J. Font ,
J. Muntasell ,
J. Pons  and
E. Cesari
J. Font
Affiliation:
Departament de Física i Enginyeria Nuclear, ETSII, Universitat Politècnica de Catalunya, Avda. Diagonal, 647 E-08028 Barcelona, Spain
J. Muntasell
Affiliation:
Departament de Física i Enginyeria Nuclear, ETSII, Universitat Politècnica de Catalunya, Avda. Diagonal, 647 E-08028 Barcelona, Spain
J. Pons
Affiliation:
Departament de Física, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, E-07071 Palma de Mallorca, Spain
E. Cesari
Affiliation:
Departament de Física, Universitat de les Illes Balears, Ctra. de Valldemossa, km 7.5, E-07071 Palma de Mallorca, Spain
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Abstract

The effects of thermal cycling through the martensitic transformation have been studied in three Cu–Al–Ni–Mn–B high temperature shape memory alloys. An increase of the martensitic transformation temperatures with the number of cycles (up to ∼7 K after 60 cycles) has been generally observed by DSC measurements. The microstructure of these alloys is rather complicated, with the presence of big manganese or aluminum boride particles and small boron precipitates, as well as the formation of dislocations during thermal cycling. By means of aging experiments, it has been shown that the evolution of transformation temperatures during cycling is mainly due to the step-by-step aging in parent phase accompanying the thermal cycling, and that the dislocations formed during cycling have only a very small effect, at least up to 60 cycles.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 9 , September 1997 , pp. 2288 - 2297
Copyright
Copyright © Materials Research Society 1997

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References

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