Cryogenic-temperature-induced structural transformation of a metallic glass

Year: 
2017
Month: 
7
Day: 
4
Pages: 
284-291
DOI: 
10.1080/21663831.2016.1263687
Type: 
Journal Articles
Journal: 
Materials Research Letters
Volume: 
5
Abstract: 

The plasticity of metallic glasses depends largely on the atomic-scale structure. However, the details of the atomic-scale structure, which are responsible for their properties, remain to be clarified. In this study, in-situ high-energy synchrotron X-ray diffraction and strain-rate jump compression tests at different cryogenic temperatures were carried out. We show that the activation volume of flow units linearly depends on temperature in the non-serrated flow regime. A plausible atomic deformation mechanism is proposed, considering that the activated flow units mediating the plastic flow originate from the medium-range order and transit to the short-range order with decreasing temperature.