Dresden 2009 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 43: Liquid and Amorphous Metals II

MM 43.4: Vortrag

Donnerstag, 26. März 2009, 16:45–17:00, IFW A

Modelling the mechanical properties of bulk metallic glasses with nanoscale precipitates — •Yvonne Ritter and Karsten Albe — Institut f. Materialwissenschaft, TU Darmstadt, Petersenstr. 23, D-64287 Darmstadt

Bulk metallic glasses exhibit unique mechanical properties as compared to conventional crystalline metals. Large elastic strains and specific strengths exceeding the strength of crystalline alloys by more than 100% illustrate the high potential for structural applications. On the other hand, metallic glasses have a relatively low tensile ductility and fail catastrophically when reaching the flow stress. Nanoscale precipitates in the glassy matrix were found to improve the plasticity of BMGs. The underlying mechanisms, however, that lead to the improved deformation bahavior have not yet been exposed. In this study, we investigate the role of structural inhomogeneities in CuZr by means of molecular dynamics simulations. Nanoprecipates of crystalline Cu and CuZr as well as amorphous precipitates with varying composition are investigated and their influence on the materials behavior under tensile load and shear is investigated.