Cryogenic-temperature-induced structural transformation of a metallic glass. Issue 4 (4th July 2017)

• Record Type: Journal Article
• Authors: Bian, Xilei; Wang, Gang; Wang, Qing; Sun, Baoan; Hussain, Ishtiaq; Zhai, Qijie; Mattern, Norbert; Bednarčík, Jozef; Eckert, Jürgen
• Is Part Of: Materials research letters. Volume 5:Issue 4(2017)
• Page Start: 284
• Page End: 291
• Publication Date: 2017-07-04
• Subjects: Metallic glass -- cryogenic temperature -- high-energy X-ray diffraction -- flow units; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2016.1263687
• Languages: English
• ISSNs: 2166-3831

Abstract

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. GRAPHICAL ABSTRACT: IMPACT STATEMENT An atomic deformation mechanism in metallic glasses is proposed. Activated flow units mediating the plastic flow originate from the medium-range order and transit to the short-range order with decreasing temperature.