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1 2009

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Structure and crystallization kinetics of amorphous Al-Ni-Si alloy

Gögebakan M., Okumus M.

Materials Science Poland

2009

Vol. 27, No. 1

79--87

In the present work, the structure and crystallization kinetics of rapidly solidified Al70Ni13Si17 amorphous alloy have been investigated by a combination of differential scanning calorimetry (DSC) and X-ray diffractometry (XRD). Amorphous ribbons were obtained by melt spinning at wheel speeds higher than 10 m/s. Crystallization of amorphous Al70Ni13Si17 alloy during continuous heating in DSC, takes places in three stages: (1) formation of fcc-Al and hexagonal phases; (2) growth of fcc-Al and hexagonal phases; (3) formation of fcc-Si and orthorhombic Al3Ni phases. Isothermal annealing DSC traces for this amorphous alloy, the first crystallization peak showed a clear incubation period, and the Avrami time exponent n has been determined to be 2.4-2.8 using the Johnson-Melh-Avrami analysis. This suggested that the transformation reaction involved continuous nucleation and three dimensional diffusioncontrolled growth. Electrical resistivity of the alloy was measured as 33x10-6 ? cm for the amorphous structure and 1x10-6 ? cm for the crystalline one. This study describes the structure and crystallization kinetics of a rapidly solidified Al70Ni13Si17 amorphous alloy.