Atomic dynamics transition in a Cu-Zr-Al metallic glass
Atomic dynamics transition in a Cu-Zr-Al metallic glass
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Cu-Zr-Al 金属玻璃中的原子动力学转变
DOI：
10.1016/j.scriptamat.2020.05.002
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发表时间：
2020
影响因子：
6
通讯作者：
Jiang J. Z.
中科院分区：
文献类型：
--
作者：
Wang X. D.;Xu T. D.;Su Y.;Tang Y.;Sprung M.;Cao Q. P.;Zhang D. X.;Jiang J. Z.
我们揭示了铸态 Cu46Zr46Al8(at.%) 金属玻璃 (MG) 在加热时低于玻璃化转变温度时的从慢到快的动态转变，这取决于自由体积湮灭和热激活原子迁移率之间的竞争，与 Cu-Cu 对的键长变化非常一致。高温下α-弛豫的激活可能与Cu-Cu和Zr-Zr类原子对的键长延长以及Cu-Zr类原子对的缩短有关。我们的结果为 MG 中的动力学与原子结构的相关性提供了新的见解，并将有助于理解 MG 的老化行为。
We reveal a slow-to-fast dynamics transition in the as-cast Cu46Zr46Al8(at.%) metallic glass (MG) at a temperature below the glass transition upon heating, which depends on the competition between free volume annihilation and thermally-activated atomic mobility, well consistent with the bond-length change of Cu-Cu pairs. The activation ofα-relaxation at high temperatures could be related to the bond-length extension of Cu-Cu and Zr-Zr like-atom pairs together with the shortening of Cu-Zr unlike-atom pairs. Our results provide new insights into the correlation of dynamics with atomic structure in MGs and will be helpful to the understanding of ageing behaviors in MGs.