J. Phys. IV France
Volume 112, October 2003
Page(s) 789 - 793

J. Phys. IV France
112 (2003) 789
DOI: 10.1051/jp4:20031000

Comparative study of structure and strain diagram changes in Ti-Ni alloys thermomechanically treated in martensitic or austenitic states

S.D. Prokoshkin1, I.Yu. Khmelevskaya1, V. Brailovski2, F. Trochu3, S. Turenne3, V.Yu. Turilina1 and K.E. Inaekyan1

1  Moscow Steel and Alloys Institute, Laboratory of Thermomechanical Treatment, Leninsky Prosp. 4, Moscow 119991, Russia
2  École de Technologie Supérieure, Département de Génie Mécanique, rue Notre-Dame Ouest 1100, Montréal, Québec H3C 3A7, Canada
3  École Polytechnique de Montréal, P.O. Box 6079, Station Centre Ville, Montréal, Québec H3C 3A7, Canada

Structure changes in the B2-austenite of Ti-Ni alloys during heating in the range 200-700°C after lowtemperature thermomechanical treatment including plastic defonnation of the martensite (LTMT $_{\rm M}$) or stable austenite (LTMT $_{\rm A}$), and their influence on strain diagram parameters were studied. The processes of post-deformation softening (recovery, polygonization and recrystallization) during heating after LTMT $_{\rm M}$ develop more rapidly than after LTMT $_{\rm A}$ that is caused by higher stored strain energy. Peculiarities of changes in strain diagram parameters with postdeformation heating temperature are caused by direct as well as indirect influences ofthe austenite substructure.

© EDP Sciences 2003