Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 58: Topical Session: Fundamentals of Fracture - Fatigue Fracture

MM 58.4: Vortrag

Donnerstag, 14. März 2013, 16:45–17:00, H4

R-curve characteristics of Zr-based bulk metallic glasses — •Davide Granata, Samuele Laffranchini, and Jörg F. Löffler — Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland

In light of the utilization of bulk metallic glasses (BMGs) as structural materials the fracture toughness has to be significantly enhanced. Thereby, it is of great importance to gain a better understanding of the experimental and structural factors governing the resistance to fracture. However, only a few BMGs with high fracture toughness values have been developed so far. Due to limited sample thickness and major difficulties concerning the controlled introduction of a straight fatigue pre-crack most of these investigations do not follow the standard ASTM test methods. Most recently, feasible R-curves of ductile Pd- and Zr-based BMGs have been measured yielding promising values comparable to conventional steel and crystalline titanium alloys respectively. In this study, results relating to the implementation of R-curves in the Zr-Cu-Al ternary and Zr-Cu-Al-Ta quaternary system are reported. To this effect, conclusions on the most important experimental parameters are presented and the measured fracture toughness values are related to bonding characteristics.