کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1484791 | 1510526 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Stabilization of metallic glass studied by internal friction measurement Stabilization of metallic glass studied by internal friction measurement](/preview/png/1484791.png)
The internal friction Q−1 and the oscillation frequency f of Zr–Ti–Cu–Ni–Be metallic glass specimens were measured using an inverted torsion pendulum with the free decay method. A single-roller melt-spinning apparatus was used for preparing the specimens. Isothermal annealing near the glass transition temperature Tg was performed to investigate the stabilization of the specimens. Q−1 decreased with annealing time t due to the stabilization. Q−1-vs-t was measured at various annealing temperatures Ta, and the values of relaxation time τ for the stabilization process were determined. The dependence of τ on Ta showed that the hydrodynamic behavior represented by the Vogel–Tammann–Fulcher form and the hopping behavior represented by the Arrhenius form were observed in high- and low-temperature regions, respectively. The crossover of the two behaviors was seen at a temperature near and somewhat higher than Tg. The result was discussed on the basis of the viscoelastic relaxation in glassy materials.
Journal: Journal of Non-Crystalline Solids - Volume 354, Issues 15–16, 15 March 2008, Pages 1780–1785