Fabrication of bulk amorphous Fe-Co-B-Si-Nb alloy by atomization and hot extrusion route

Abstract

From the 90s of last century increased commercial application of metals with amorphous structure is being observed in products such as micro gears, springs and watches and mobile phones housings. This is due to the development of new compositions and processes that allow the production of large parts "bulks" (with dimensions of the order of millimeters or centimeters in contrast to the traditional amorphous ribbons with a few tens of microns thick) with exceptional mechanical properties. The major challenges, scientific and technological, are the development of new compositions that have high glass forming ability (GFA) and the development of manufacturing technology of the parts with geometry and required dimensions, the latter with the challenge of low thermal stability of amorphous structure. The goal of this master thesis is the study of a route for the manufacture of bulk samples (cylinder samples with diameter bigger than 5 millimeters) with amorphous structure with the Fe-Co-B-Si-Nb by the route of production of amorphous atomized powders and consolidation of these powders by hot extrusion process. (AU)