Abstract
Microstructural changes during annealing of amorphous Al 85Y 5Ni 10 and Al 85Y 10Ni 5 alloy ribbons have been studied by a combination of differential scanning calorimetry, transmission electron microscopy and X-ray diffractometry. As-solidified melt spun Al 85Y 5Ni 10 consists of some atomic clusters or microcrystals embedded in an amorphous matrix, resulting in a shoulder on the amorphous halo diffraction pattern. The alloy crystallizes by primary crystallization of an fcc α solid solution followed by precipitation of orthorhombic Al 3Ni. As solidified melt spun Al 85Y 10Ni 5 consists of a fully amorphous structure with no shoulder on the amorphous halo diffraction pattern. The alloy crystallizes by primary crystallization of an fcc α solid solution followed by an eutectic reaction to form α and hexagonal A1 3Y.
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