Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 47: Liquid and Amorphous Metals III
MM 47.3: Vortrag
Freitag, 27. März 2009, 10:45–11:00, IFW A
Thermal stability of Fe-Co-B-Si-Nb glassy alloy — •Trisha Karan1,2, Shanker Ram2, Mihai Stoica1, and Jürgen Eckert1,3 — 1IFW Dresden, Institute for Complex Materials, P.O. Box 270116, D-01171 Dresden, Germany — 2Materials Science Centre, Indian Institute of Technology, Kharagpur 721302, India — 3TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany
The thermal stability of Fe-Co-B-Si-Nb glassy alloy is studied by using high temperature differential scanning calorimetery. When the ribbons/rods made from this alloy are heated with a constant heating rate, the glass transition appears as a change in heat capacity and it is followed by one exothermic peak which corresponds to the crystallization process. The glass transition temperature Tg and the crystallization temperature Tx were measured as the onsets of the respective events. Higher the value of Tg and Tx higher is the thermal stability. It was found that in case of continuous heating with a constant rate of 10 K/min the value of Tg and Tx are 808 K and 844 K, respectively. Moreover, a small difference in thermal stability between the rods and the ribbons was observed, which may be due to the different degree of relaxation as a result of different cooling rates reached during solidification. The enthalpy of crystallization, which indicates the stability of super cooled liquid, was found to be -29.72 J/g. Thus, the alloy has good thermal stability and can be used for industrial applications. Additionally, the crystallization behaviour will be discussed.