Original scientific paper
The temperature dependence of coefficient of viscosity for Cu60Zr40 and Ni64Zr36 metallic glasses
Egvin Girt
; Faculty of Science, University of Sarajevo, 71000 Sarajevo, Yugoslavia
Predrag Tomić
; Institute of Physics, 71000 Sarajevo, Yugoslavia
Tatjana Mihać
; Faculty of Science, University of Sarajevo, 71000 Sarajevo, Yugoslavia
Željko Majstorović
; Faculty of Science, University of Sarajevo, 71000 Sarajevo, Yugoslavia
Ahmet Kuršumović
; Institute of Physics, 71000 Sarajevo, Yugoslavia
Abstract
The cold finger method was used for dilatometric measurements of Cu60Zr40 and Ni64Zr36 amorphous samples at elevated temperatures under applied tensile stress. The creep process was identified from the experimental data by separation of the free volume annealing process. It was found out that this process occurs at lower temperatures for the Ni64Zr36 system and that it follows a linear time dependence. The coefficient of viscosity was evaluated from the data for creep for both systems, their functional dependence on temperature was given and activation energies for the systems were evaluated. The obtained temperature dependence of the coefficient of viscosity was of the form η = η0 exp (∆E/kT). The evaluated activation energies for Cu60Zr40 and Ni64Zr36 amorphous systems were 178.8 kJ/mole and 41.2 kJ/mole, respectively.
Keywords
Hrčak ID:
328427
URI
Publication date:
3.1.1983.
Visits: 479 *