Regensburg 2004 – wissenschaftliches Programm

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M: Metallphysik

M 14: Flüssige und amorphe Metalle IV

M 14.2: Vortrag

Dienstag, 9. März 2004, 10:30–10:45, H6

Study on Crystallization Kinetics of Metallic Glass Composite — •Shankar Venkataraman¹, Jürgen Eckert^1,2, 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.