Berlin 2005 – wissenschaftliches Programm

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M: Metallphysik

M 13: Flüssige und amorphe Metalle IV

M 13.2: Vortrag

Freitag, 4. März 2005, 16:45–17:00, TU H111

Decomposition and Crystallization Behavior of Pd40Cu30Ni10P20 Bulk Metallic Glass — •N. Wanderka, E. Davydov, and M.-P. Macht — Hahn-Meitner-Institut Berlin, Glienicker Str. 100, 14109 Berlin, Germany

The Pd40Cu30Ni10P20 glass is one of the most stable metallic bulk glasses. The main aim of this study was to investigate the crystallization pathway by differential scanning calorimetry , X-ray diffraction, transmission electron microscopy and by the three-dimensional atom probe. It is found that the glass decomposes in the supercooled liquid state before crystallization starts. The correlation between the decomposed amorphous phases and the primary crystalline phase of early crystallization stages is studied. The composition of the primary phase is similar to that of the crystalline phase which first forms during slow cooling of the liquid alloy melt. The chemical compositions of the different crystalline phases formed during slow cooling of the liquid melt as well as during annealing of the amorphous glass are analyzed and compared in the framework of the quasi ternary Pd-(Cu+Ni)-P system.