Nd65Al10Fe25-xCox (x=0,5,10) bulk metallic glasses with wide supercooled liquid regions

Bulk metallic glasses of Nd65Al10Fe25-xCox (x=0,5,10) have been prepared in the form of 3 mm diam rods. Results of differential scanning calrimetry, d ynamic mechanical thermal analysis (DMTA), and x-ray diffraction are presen ted for these alloys. It is shown that the glass transition and crystalliza tion have been observed by DMTA. The reduced glass transition temperature o f these glasses, defined as the ratio between the glass transition temperat ure 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 fro m 80 to 130 K. The high value of reduced glass transition temperature and w ide SLR agree with their good glass formation ability. (C) 2001 American In stitute of Physics.