Elasticity study on collective motion in metallic glasses

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 442; no. 1; pp. 297 - 301
• Main Authors: Takahashi, T., Tanimoto, H., Mizubayashi, H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 20.12.2006; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Density fluctuation; Elasticity, elastic constants; Exact sciences and technology; Free volume; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Metallic glasses; Physics; Resonant collective motion; Resonant collective motion; Free volume; Metallic glasses; Density fluctuation; Frequency dependence; Elasticity; Dynamic properties; Amorphous alloy; Young modulus; Titanium alloys; Atomic displacements; Copper alloys; Electric field effects; Transition element alloys; Zirconium alloys
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2006.01.148

The frequency dependence and the strain amplitude dependence of the dynamic Young's modulus in amorphous (a-) Cu 50Ti 50, a-Zr 50Cu 50 and a-Zr 55Cu 30Al 10Ni 5 were investigated at room temperature by means of the vibrating reed method. In the following, f and ɛ denote the frequency and the strain amplitude, respectively. The frequency dependence of the dynamic Young's modulus was measured at ɛ ∼ 10 −6 in the frequency range between 10 1 and 10 4 Hz, where a strong decrease in the dynamic Young's modulus between 10 1 and 10 4 Hz was found. The strain amplitude dependence of the dynamic Young's modulus was measured at f ∼ 10 2 Hz in the strain amplitude range between 10 −5 and 10 −3, where a strong increase in the dynamic Young's modulus with increasing strain amplitude was found. The effect of passing an electric direct-current on the dynamic Young's modulus at ɛ ∼ 10 −6 and f ∼ 10 2 Hz was also investigated, where a net increase in the dynamic Young's modulus with increasing current density in the range of 10 7 A/m 2 was found. These results were discussed from the point of view of the resonant collective motions of many atoms in metallic glasses.