Study of amorphous, metastable and nano-structured metallic alloys with emphasis on new technological applications

Abstract

The main research focus of this project is based on a critical evaluation of different properties of interest related to amorphous and nanostructured metallic alloys, aiming at the development of new technological applications for this type of advanced alloys. The different types of applications which are envisaged are associated with energy savings and more efficient use of natural resources; both indirectly as for example, by general reduction of energy consumption or, directly, by means of energy storage. The studies related with mechanical properties will be oriented to the development of high strength alloys and also to alloys adequate for different types of sensors, such as pressure or magnetomechanical sensors. In this context, the research is designed to achieve the following objectives: (a) Determination of the application-enabling macroscopic critical thickness for attaining ductile fracture behavior (toughness) in vitrified metals to be used as springs with very high resilience. (d) Development of low stiffness vitrified metal implants to minimize stress-shielding effects and allow good load transfer to the human bone in order to help stimulate new bone formation. The studies related to the chemical properties will be oriented towards the development of biocompatible components for human body implants as well as amorphous and/or nanostructured coatings with improved corrosion resistance in steel pipes. In this context, the research is designed to achieve: (a) Development of biocompatible Ti, Zr, and Mg-based bulk vitrified metals for implants free of toxic elements. (b) Developments of Fe-based amorphous alloys with improved corrosion resistance, establishment of adequate coating procedure and complete performance evaluation. The studies directly related with energy applications will be oriented towards the development of Mg-based nanocomposites with adequate H-sorption properties and their use in hydrogen storage and transportation units. In this context, the research is designed to achieve: (a) Production of Mg-based nanostructured composites in both powder and bulk forms containing selected additives and characterization of the H-sorption properties. (b) Enhancement the understanding (both from experimental results as by computer modeling) of the effect of addition of catalysts on the absorption/desorption of hydrogen based on Mg based nanocomposite. As above mentioned, the interest in these systems, lines and property converge to the critical evaluation of a new stage, the technological applications, the applicant's research activity involving mainly the amorphous metals and evolve with the studies of metastable and nano-structured materials. Furthermore, there is a deeply felt need within for the candidate to improve his knowledge in a research center of highest level, which specializes in amorphous materials, since he never had such an opportunity since his doctorate in 1997. This internship should help greatly especially in doctoral supervisions that has being developed in the field of amorphous materials. (AU)