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Glass forming ability and crystallization kinetics in Zr59Cu18Ni8Al10X5 (XP%Nb, Ti and Ta) bulk glassy alloys

Nasr-EddineChakri, AliHafs, Badis Bendjemil, Ahmed Belbeh,AhceneMouassa, Marcello Baricco2

In the present work, the formation of amorphous phase as primary phase was found in Zr59Cu18Ni8Al10X5 (XP%Nb,Ti andTa) glassy alloys. Wedge shaped bulk samples, with thickness form 2 mmup to 5mm,were prepared bycoppermould casting technique.Ribbons of the same composition,with 30µm thickness, were prepared by melt spinning technique. The thermal stability and structural properties were evaluated by differential scanning calorimetry (DSC) andX-raydiffraction (XRD), respectively.The effect of high temperature on the isothermal crystallization of Zr59Cu18Ni8Al10X5 (XP%Nb,Ti andTa) bulk metallic glass rodwith a diameter of 2mmwas investigated byHTX-ray diffraction. It was found that the crystallization behaviour of Zr59Cu18Ni8Al10X5 (XP%Nb, Ti and Ta) bulkmetallic glass strongly depends onthe annealing temperature.The different crystallization behaviour is believed to be due to the different structures that the metallic glass possesses at different temperatures.