Article ID Journal Published Year Pages File Type
1450130 Acta Materialia 2006 8 Pages PDF
Abstract

Bulk amorphous Zr62−xTixCu20Ni8Al10 alloys with compositions of 0 ⩽ x ⩽ 7.5 were prepared by copper mold casting. Thermal stability and crystallization behavior of the specimens were characterized by differential scanning calorimetry. Structures were studied by X-ray diffraction and transmission electron microscopy. The mass density of the as-cast samples and of selected annealed states was determined. The difference in density changes, between as-cast glassy, relaxed and crystallized structures, depends on the Ti content of the alloys. The higher the packing density of the glassy state, the higher is the thermal stability of the bulk glass due to a decrease in atomic mobility. Small gradations of Ti in steps of 0.2 at.% reveal significant changes in the crystallization behavior of the alloys, concerning the size and the structure of the phases formed. Only compositions with 2 ⩽ x < 4 form a metastable quasicrystalline phase during the first transformation step.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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