Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 67: Mechanical Properties I

MM 67.4: Vortrag

Donnerstag, 23. März 2017, 16:30–16:45, IFW D

Nanotribology and deformation behavior of gradually crystallized Fe-based metallic glasses — •Jazmin Duarte Correa, Steffen Brinckmann, and Gerhard Dehm — Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany

Although metallic glasses are acknowledged for their superior mechanical, physical and chemical properties, they are seldom used due to the limitations imposed by the required fast cooling rates to produce large volumes of material, and by their thermal stability. A window of opportunity is the use of these alloys at small length scales, e.g. gears for micromotors, or in wear and corrosion protective coatings.

In particular, Fe-based amorphous materials have been already proposed for both applications since they exhibit remarkable mechanical properties such as high yield stress and elastic stiffness, low strain hardening rates and low temperature dependence of the flow stress. For this work, samples of amorphous Fe-Cr-Mo-C-B alloys were gradually crystallized and submitted to nanoindentation and nanotribology tests. We discuss the correlation of the changing microstructure to the deformation behavior and the material strength. For instance, while the hardness of the alloy alloy increases with increasing crystallization, the wear resistance decreases due to the formation of a complex nanostructure formed by carbides and intermetallic phases.