J. Phys. IV France 01 (1991) C4-211-C4-216
THE STABILIZATION OF 18R AND 2H MARTENSITES IN Cu-Zn-Al ALLOYS WITH AN ELECTRON CONCENTRATION e/a = 1.534J.-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
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