Abstract
The microstructural features of a Cu 60Zr 20Hf 10Ti 10 bulk metallic glass (BMG) has been studied using an ultrasonic technique with a pulse-echo overlap method upon high pressure and crystallization. By comparing the elastic constants and the EOS with those of its metallic components and its crystallized state, it is found that the BMG has a highly random packed structure which is very close to a crystalline alloy and the main component of Cu. However, the BMG behaves strikingly by transverse phonon softening compared to its crystallized state, indicating that the glass has completely different short-range configuration compared to that of its crystallized state. The microstructural features result in the excellent glass-forming ability of the BMG-forming alloy.
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