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American Physical Society, Physical Review Letters, 4(115)

DOI: 10.1103/physrevlett.115.045501

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Crossover from Localized to Cascade Relaxations in Metallic Glasses

Journal article published in 2015 by Yue Fan, Takuya Iwashita, Takeshi Egami
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Thermally activated deformation is investigated in two metallic glass systems with different cooling histories. By probing the atomic displacements and stress changes on the potential energy landscape, two deformation modes, a localized process and cascade process, have observed. The localized deformation involves fewer than 30 atoms and appears in both systems, and its size is invariant with cooling history. However, the cascade deformation is more frequently observed in the fast quenched system than in the slowly quenched system. The origin of the cascade process in the fast quenched system is attributed to the higher density of local minima on the underlying potential energy landscape.