Elasticity study on collective motion in metallic glasses

[摘要] The frequency dependence and the strain amplitude dependence of the dynamic Young's modulus in amorphous (a-) CU50Ti50, a-Zr50CU50 and a-Zr55CU30Al10Ni5 were investigated at room temperature by means of the vibrating reed method. In the following, f and epsilon denote the frequency and the strain amplitude, respectively. The frequency dependence of the dynamic Young's modulus was measured at epsilon similar to 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 similar to 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 epsilon similar to 10(-6) and f similar to 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. (c) 2006 Elsevier B.V. All rights reserved.

[发布日期] 2006-12-20

[效力级别]  Proceedings Paper

[关键词] metallic glasses;resonant collective motion;density fluctuation;free volume