Objective
The development of bulk metallic glasses allows the use of their exceptional mechanical properties, i.e. Young's modulus of the order of 100 GPa and a yield stress of the order of 2 GPa as well as a low friction coefficient. Combining these properties with the high degree of processability as a glass, these materials suggest many possible applications. The objective of this research project is to manufacture bulk metallic glasses and to study their thermal stability, mechanical properties as well as their oxidation resistance. Emphasis will be on elucidation reasons for good glass-forming ability; this shall enable the design of new bulk metallic glasses with even improved glass-forming ability or with a composition exhibiting more favorable properties. In addition, conventional casting technologies, e.g. compression molding or injection molding, will be adapted for manufacturing bulk metallic glasses, in particular for net shape component fabrication. Detailed studies on crystallization will provide information urgent for designing partially crystallized microstructures with superior mechanical properties and will allow to explore glasses which exhibit slower critical cooling rates or a larger range of undercooling. The knowledge of the influence of oxidation on crystallization is important not only for understanding the reason for the strong influence of oxygen on the glass-forming ability, but also for designing metallic glasses with higher oxidation resistance. The comprehensive investigation on the temperature dependence of strength and other mechanical properties shall enable to plot a generalized scheme of deformation and fracture within the whole scale of homologous temperature T/Tg for bulk metallic glasses as well as partially crystallized materials.
The investigation will lead to a better understanding of the micro-structure/property relationship, which is essential to capitalize on material advantages in designing new components and devices.
Topic(s)
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44221 Dortmund
Germany