Nowe perspektywy zastosowań stopów z niemieszalnością w stanie w stanie ciekłym

Abstract

A number of literature data provide information on possibility of formation the amorphous matrix composites. Such composites can be produced alternatively, by introducing the particles prior to casting, or by “in situ” formation of the crystalline phase. The latter aim can be carried out by crystallization of the amorphous matrix or the formation of the crystalline phase during casting. Production of the composite directly from the liquid state, using miscibility gap, presents a new possibility and is justified as regards energy saving because no additional heat treatment to produce the fine crystalline phase is necessary. On the other hand, $Fe-Cu-P$, $Fe-Cu-Si$, $Fe-Cu-B$ systems have a miscibility gap in the liquid phase, therefore we considered the $Fe-Cu-Ni-P-based$ alloys for a series of microstructural experiments. The work presents exemplary microstructures revealed in such alloys. There are the two essential features enabling formation of the amorphous-based composites wih miscibility. The first is the presence of a large volume fraction of the eutectic microstructures and the second one is surface-fractal microstructure typical for the systems with tendency for demixing of liquids.