Relaxation decoupling in metallic glassy state

P. Luo; P. Wen; H. Y. Bai; B. Ruta; W. H. Wang

doi:10.1103/physrevlett.118.225901

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arXiv · 1609.09611

Relaxation decoupling in metallic glassy state

P. Luo·P. Wen·H. Y. Bai·B. Ruta·W. H. Wang

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Abstract

Upon cooling, glass-forming liquids experience a two-step relaxation associated to the cage rattling and the escape from the cage, and the following decoupling between the \b{eta}- and the {\alpha}-relaxations. The found decoupling behaviors have greatly changed the face of glassy physics and materials studies. Here we report a novel dynamic decoupling that the relaxation function changes gradually from a single-step to a two-step form as temperature declines through the stress relaxation of various metallic glasses in a broad time and temperature range below glass transition temperature (Tg). Such a two-step relaxation is unexpected in glassy state and reveals a decoupling of dynamic modes arising from two different mechanisms: a faster one exhibiting ballistic-like feature, and a slower one associated with a broader distribution of relaxation times typical of subdiffusive atomic motion. This first observation of two-step dynamics in metallic glassy state points to a far richer-than-expected scenario for glass relaxation.

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P. Luo, P. Wen, H. Y. Bai, B. Ruta, W. H. Wang. 2016-09-30. Relaxation decoupling in metallic glassy state. https://doi.org/10.1103/physrevlett.118.225901

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