Nd 65 Al 10 Fe 25−x Co x (x=0,5,10) bulk metallic glasses with wide supercooled liquid regions

Bulk metallic glasses of ${\mathrm{Nd}}_{\mathrm{65}}{\mathrm{Al}}_{\mathrm{10}}{\mathrm{Fe}}_{\text{25−x}}{\mathrm{Co}}_x$ $\text{(x=0,5,10)}$ have been prepared in the form of 3 mm diam rods. Results of differential scanning calrimetry, dynamic mechanical thermal analysis (DMTA), and x-ray diffraction are presented for these alloys. It is shown that the glass transition and crystallization have been observed by DMTA. The reduced glass transition temperature of these glasses, defined as the ratio between the glass transition temperature $T_g$ and the melting temperature $T_l$ is in the range from 0.55 to 0.62. All these glasses have a large supercooled liquid region (SLR), ranging from 80 to 130 K. The high value of reduced glass transition temperature and wide SLR agree with their good glass formation ability.