TITLE

On the fragility of Nb-Ni-based and Zr-based bulk metallic glasses

AUTHOR(S)
Shadowspeaker, L.; Busch, R.
PUB. DATE
September 2004
SOURCE
Applied Physics Letters;9/27/2004, Vol. 85 Issue 13, p2508
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The heating rate dependencies of the glass transition temperature of the Ni65Nb35, Ni60Nb35Sn5,Ni59.35Nb34.45Sn6.2,Ni60(Nb40Ta60)34Sn6, and Ni57Fe3Nb35Sn5 metallic glass-forming alloys were investigated with a differential scanning calorimeter (DSC). The relaxation time for each DSC experiment was plotted versus inverse temperature, and a Vogel-Fulcher-Tamman (VFT)-type relation was fitted to the data. The fragilities of the alloys were characterized with the fragility parameter, D&lowest;, and the VFT temperature, T0, which are the fit parameters from the VFT relation. It was found that for the binary alloy D∗=6.2, for the ternary alloys D∗=11.0, and that for the quaternary alloys D∗ was between 16.4 and 19.0. These D&lowest; increase monotonically as the number of components in the alloy is increased. It was also found that the fragilities of Zr-based alloys show a similar trend.
ACCESSION #
14546619

 

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