Low temperature dependence of elastic moduli and internal friction for the glassy alloy Zr55Cu30Al10Ni5 |
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| Authors: | Mikio Fukuhara Xinmin Wang Akihisa Inoue Fuxing Yin |
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| Affiliation: | 1. Institute for Materials Research, Tohoku University, Sendai 980‐8577, Japan;2. National Institute for Materials Science, Sengen 1‐2‐1, Tsukuba 305‐0047, Japan |
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| Abstract: | Longitudinal and transverse wave velocities, eight kinds of elastic parameters, and dilational and shear internal frictions of Zr55Cu30Al10Ni5 glassy alloy were simultaneously measured as a function of temperature in the range from 77 to 373 K, using an ultrasonic pulse method. The inflections at around 150 K for wave velocities, anisotropy factor and Poisson's ratio, and the 150 K peak of shear friction seem to correspond to one topological change (pseudo‐transition) associated with an interatomic readjustment or vacancy rearrangements. The behaviors from 77 to 125 K and 125 to 373 K are due to thermal relaxation of squeezed free volumes and entropy elasticity associated with vibrational motions of clusters, respectively, accompanied by an increase in atomic distance. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | 61.43.Dq 61.43.Fs 62.20.Dc 62.40.+i |
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