Crystallization of Zr50Cu40Al10 Metallic Glass by Rapid Heating Process
Shuo Zhang, Tetsu Ichitsubo, Eiichiro Matsubara, Yoshihiko Yokoyama and Tokujiro Yamamoto
Abstract:The origin of thermal stability and crystallization process of Zr50Cu40Al10 metallic glass have been investigated by means of differential scanning calorimetry （DSC）, x-ray diffraction （XRD） and resonant ultrasound spectroscopy （RUS） techniques, by comparing to Zr70Cu20Al10 and Zr70Cu30 glassy alloys. The thermal stability of Zr50Cu40Al10 is significantly higher than those of the others. The x-ray diffraction analysis indicates that constituent atoms in Zr50Cu40Al10 are closely packed in a glassy state. It was found from DSC that Zr50Cu40Al10 glass shows a complicated crystallization process when it is heated at usual heating rates, but when it is rapidly heated, the ordered B2-type ZrCu （equilibrium phase higher than 984K） is formed as a primary phase. This behavior is discussed in terms of the long-range-diffusion of atoms. Key Words:Bulk metallic glasses, Zirconium, Crystallization, Structure, DSC, FE-SEM, X-ray diffraction