Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9803872 | Journal of Alloys and Compounds | 2005 | 8 Pages |
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 (EAÂ =Â 4.5Â eV) and the very high value of the pre-exponential factor (Ï0â1Â =Â 2.5Â ÃÂ 10â35Â 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
Authors
J.M. Pelletier,