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Numéro
J. Phys. IV France
Volume 01, Numéro C4, Novembre 1991
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES
Page(s) C4-211 - C4-216
DOI http://dx.doi.org/10.1051/jp4:1991431
EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATION AND SHAPE MEMORY PROPERTIES

J. Phys. IV France 01 (1991) C4-211-C4-216

DOI: 10.1051/jp4:1991431

THE STABILIZATION OF 18R AND 2H MARTENSITES IN Cu-Zn-Al ALLOYS WITH AN ELECTRON CONCENTRATION e/a = 1.534

J.-E. BIDAUX1 and M. AHLERS2

1  Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
2  Centro Atomico Bariloche, RA-8400 S.C. de Bariloche, Argentina


Abstract
Stabilization has been studied in Cu-Zn-Al alloys with an electron concentration e/a = 1.534. In addition to the usual 18R and 6R martensites in which stabilization has been already investigated quite extensively, these alloys exhibit at low temperature a transformation to a 2H structure. Our results show that aging of the 18R phase leads to a stabilization of the 18R phase with respect to the parent L21 phase which is very reduced compared to the one observed in alloys with e/a = 1.48. In addition, stabilization of the 18R phase with respect to the 2H phase results in the suppression of the 18R [MATH] 2H transformation which occurs normally upon unloading at low temperature. In contrast, no change is observed for the 18R [MATH] 6R transformation. First results of the stabilization of the 2H phase with respect to the parent L21 phase are presented.



© EDP Sciences 1991