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The present paper aims to study the crystallization behavior and the elastic properties of Cu 58.1 Zr 35.9 Al 6 bulk metallic glass using ultrasonic pulse focusing method. It is found that the changes of the elastic properties and microstructure can be classified into three stages corresponding to different temperature regions. Below the glass transition temperature T g , no structural change was observed by X-ray diffraction, and annealing only induced structural relaxation. After annealing at the super-cooled liquid region, the new phase Cu 10 Zr 7 formed, meanwhile, some anomalous acoustic and elastic behaviors occurred near T g (490). Above the onset crystallization temperature T x , the elastic properties increased further with the elevated temperature and Cu 8 Zr 3 phase was also observed besides Cu 10 Zr 7 phase. The annealing has a significant effect on the elastic property and microstructure of Cu 58.1 Zr 35.9 Al 6 bulk metallic glass, which is closely related to the annihilation of quenched-in free volume and the improvement of the atom order degree. |
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