VISCOUS-FLOW OF AMORPHOUS-ALLOYS UNDER COMPRESSIVE AND TENSILE STRESSES

Abstract In this paper the “region boundary” model is suggested on the basis of the study of the viscous flow of NiP, FeSiB amorphous alloys under compression and tension. The flow coefficient determined from the experiments is about 0.3–0.5 which is almost consistent with the value estimated from the model. In order to obtain the ideal glass transformation temperature T ° g , a temperature T vs is defined at which stable flow starts and extrapolating the T vs − φ curve to φ → 0 corresponds to T ° g . The tests were performed with TMS-2 and DSC-2 thermal analysers. The obtained viscosity η may be extended to the liquid state according to the formula η=η 0 A exp B+bT (1−1/T) T−T ° vs