PREPARATION AND MAGNETIC CHARACTERIZATION OF (FE78B14SI8)-NB-Y BULK METALLIC GLASS
Authors
R. Piccin
P. Tiberto
M. Baricco
N. Lecis
M. Vedani
Abstract
In the present work, the glass formation of Fe78B14Si8 alloy with small additions of Nb and Y has been investigated. Ribbons were prepared by planar-flow casting. Small ingots (up to 5 mm in diameter) were obtained by injection casting technique into a cylindrical Cu mold. Thermal and structural properties were measured using differential scanning calorimetry (DSC) and X-Ray diffraction (XRD), respectively. The microstructure has been observed by Scanning Electron Microscopy (SEM). Quasi-static hysteresis loops have been measured using a vibrating sample magnetometer (VSM). Rapid solidification leads to a fully amorphous structure for all compositions. A fully amorphous structure has been obtained in samples prepared by copper mold casting, when adding Nb and Y. The role of Nb and Y addition on glass formation is discussed on the basis of melting behavior, analyzed by HT-DSC. Magnetic properties are correlated with the observed microstructures.