Abstract
Macroscale compositional inhomogeneity was found in Zr50Cu50 (at. %) bulk metallic glass castings prepared by rapid solidification. The variation of composition in the castings from surface to interior is attributed to the Soret effect induced by a large temperature gradient during cooling. Copper exhibits a positive Soret coefficient, and its concentration increases with temperature gradient. The Soret effect was detected up to a depth of 250μm and its magnitude depended on the size of the casting. The compositional inhomogeneity resulting from the Soret effect has a significant influence on the nucleation of crystallization phases in the Zr50Cu50 metallic glass.
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