Article ID Journal Published Year Pages File Type
9803872 Journal of Alloys and Compounds 2005 8 Pages PDF
Abstract
The dynamic mechanical response was investigated in a bulk metallic glass Zr46.8Ti13.8Cu12.5Ni10Be27.5 (called Vit4). Mechanical spectroscopy was performed either using continuous heating or isothermal measurements. A main visco-elastic relaxation is observed before the onset of crystallization. A drastic decrease of the storage modulus and a maximum of the loss modulus indicate this relaxation in the amorphous state. The very large activation energy (EA = 4.5 eV) and the very high value of the pre-exponential factor (τ0−1 = 2.5 × 10−35 s) indicate that this relaxation involves the collective movement of a large number of atoms, as in many amorphous materials (polymers, oxide or molecular glasses). Master curves are plotted, indicating that the time-temperature superposition principle is obeyed. These master curves can be described using a physical model based on the concept of quasi-point defects. Finally, the elastic, visco-elastic and visco-plastic contributions to the deformation are separated and discussed.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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