Regensburg 2004 – scientific programme
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M: Metallphysik
M 14: Flüssige und amorphe Metalle IV
M 14.2: Talk
Tuesday, March 9, 2004, 10:30–10:45, H6
Study on Crystallization Kinetics of Metallic Glass Composite — •Shankar Venkataraman1, Jürgen Eckert1,2, Ludwig Schultz1, and Daniel Sordelet3 — 1IFW Dresden, P F 270016, D 01171, Dresden, Germany — 2Technische Universität Darmstadt, FB 11 Material- und Geowissenschaften,FG Physikalische Metallkunde,Petersenstrasse 23, D-64287, Darmstadt, Germany — 3Ames Laboratory, 107 Metals Development, Ames, IA 50011 USA
Cu47Ti33Zr11Ni8Si1 metallic glass powders were prepared by gas atomization and reinforced with Cu metallic particles by ball milling. The characterisations of the resultant composite mixtures were performed using x-ray diffraction, differential scanning calorimetry and microscopy. The kinetics of crystallization of the multicomponent metallic glass as well as a ball milled metallic glass composite has been investigated by differential scanning calorimetry under isochronal and isothermal conditions. From the constant rate heating (isochronal) measurements the Kissinger analysis has been used to find the activation energy for crystallization whereas the Johnson-Mehl-Avrami (JMA) analysis has been employed to understand the crystallization mechanism occurring under isothermal conditions. The activation energy values obtained for the metallic glass as well as the ball milled composites are nearly identical. The addition of Cu reinforcement does not affect the crystallization kinetics of the amorphous matrix composites.