Hot extrusion and characterization of (La0,5Ce0,5)60Al15Co25 metallic glass

Abstract

Metallic glasses exhibit high yield strength (close to theoretical limits), large elastic strain, high corrosion resistance and exceptional magnetic properties. They are used as coatings, magnetic cores, miniaturized parts, sensors and sport goods and are promising in several other applications. The high cooling rate necessary to keep the amorphous structure during solidification limits their size to the mm range. To overcome this size limitation several processing routes have been investigated as welding, additive manufacturing and extrusion. Extrusion allows consolidating powders to form large bulk samples and to produce wires or plates with a large length/thickness ratio. Several features are necessary for a successful extrusion as a good temperature control, short extrusion time, atmosphere control and an optimized extrusion ratio. The present project aims to investigate the hot extrusion of (La0,5Ce0,5)60Al15Co25 metallic glasses. The extrusion will be carried out using a different setup consisting of a nozzle and a hot stage used in additive manufacturing machines. The influence of the different parameters (extrusion ratio, extrusion temperature, strain rate, etc.) will be investigate. Ingots will be produced by arc melting and ribbons will be produced by melt spinning. The ingots will be used to produce rods by Cu-mold suction casting and they will be used in the extrusion. The ribbons, rods and the extruded material will be characterized by X-ray diffraction (DRX), differential scanning calorimetry (DSC) and scanning electron microscopy (MEV). (AU)