Dresden 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MM: Fachverband Metall- und Materialphysik
MM 43: Liquid and Amorphous Metals II - Mechanical properties
MM 43.2: Talk
Wednesday, April 2, 2014, 12:00–12:15, IFW A
Diffusion, Structure and Crystallization in a HPT-deformed bulk metallic glass — •Jonas Bünz1, Koichi Tsuchiya2, Sergiy Divinsky1, and Gerhard Wilde1 — 1Institut für Materialphysik, WWU Münster, Germany — 2National Institute of Materials Science, Tsukuba, Japan
Metallic glasses show unique properties compared to their crystalline counterparts, but their applicability is limited by the lack of sufficient plasticity. Stress localization and the associated shear softening strongly weaken the structure, thus leading to the formation of shear bands. The structure of shear bands is still far from being understood. The HPT-technique allows the deformation of glasses with very high strains and thus leads to a rejuvenation of the structure and shear band densities which are obtainable with almost no other experimental technique. Thus, severely deformed glasses can act as a model system for integral testing methods such as calorimetry or diffraction analysis. Due to their extreme sensitiveness to the free volume localization, the diffusion measurements by the radiotracer technique can bring further insight into the structural modifications of shear bands with respect to the amorphous matrix as well as to the conditions of shearing during plastic straining. Here, the results of a combined study of diffusion process, crystallization behaviour and structure evolution in a HPT-deformed Zr-based bulk metallic glass are reported.