|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIV
||Atomic Dynamics in La-based Metallic Glasses by X-ray Photo Correlation Spectroscopy
||Xiaodong Wang, Jin Zhang, Qing Yu, Qingping Cao, Jianzhong Jiang
|On-Site Speaker (Planned)
The atomic dynamics and its structure dependence in a glass are fundamental issues but still little understood for decades. Through the state-of-the-art x-ray photo correlation spectroscopy (XPCS), we reveal that the atomic dynamics in a -relaxation pronounced La-Al-Ni metallic glass slows down by one order of magnitude upon annealing but is still comparable in a La-Al-Cu glass when heating from low to high temperatures. In contrast, both ascast samples exhibit an anomalous slow dynamics compared to the annealed ones when initially cooling from high temperatures. This inconsistency in relaxation times during heating and cooling can be ascribed to the lower stability of ascast samples against crystallization, in which intermittent ageing dynamics is also observed. It is suggested that the reported intermittent ageing mode may be not the intrinsic feature of the glass but the combination of glass and its crystalline phases.
||Planned: Supplemental Proceedings volume