Speaker
Description
Rejuvenation in glasses is defined as an excitation to a higher energy state by an external stress. Ketov et al. reported a rejuvenation effect in metallic glasses (MGs) by a temperature cycling between room and liquid N$_2$ temperatures [1]. Hufnagel reviewed such a cryogenic rejuvenation, and suggested that non-affine deformation must be caused on an atomistic length scale [2]. We carried out a high-energy x-ray diffraction (HEXRD) and an elementally-selective anomalous x-ray scattering (AXS) on a Gd$_{65}$Co$_{35}$ MG. We analyzed these data by a reverse Monte Carlo modeling, and found distinct structural changes around both the Gd and Co atoms [3]. Subsequently, we performed the same experiments and analyses on a Gd$_{65}$Ni$_{35}$ MG, and closely similar results were realized in partial structures. In this presentation, we will report the structural changes of the Gd$_{65}$TM$_{35}$ MG alloys by the cryogenic rejuvenation in detail.
[1] S. V. Ketov et al., Nature 524, 200 (2015)
[2] T. C. Hufnagel, Nature Mater. 14, 867 (2015)
[3] S. Hosokawa et al., to be submitted to Sci. Adv.
