J. Phys. IV France
Volume 11, Numéro PR8, Novembre 2001Fifth European Symposium on Martensitic Transformations and Shape Memory Alloys
|Page(s)||Pr8-47 - Pr8-52|
J. Phys. IV France 11 (2001) Pr8-47-Pr8-52
Transformation dislocations and transformation induced crystal defects in CoFe alloysT. Waitz and H.P. Karnthaler
Institute of Materials Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
In CoFe alloys the transformation dislocations and the transformation induced defects were analysed by both conventional transmission electron rnicroscopy and high-resolution transmission electron microscopy methods. The thermally induced transformation fcc → dhcp occurs by the glide of transformation dislocations that all have the same Shockley partial Burgers vector and therefore cause large shear strains. Plastic deformation near the front of the glissile interface activates glide dislocations in the fcc parent phase. Their subsequent reactions with the transformation dislocations lead to a high density of grown-in dislocations and stacking faults in the dhcp lattice.
© EDP Sciences 2001