期刊
SCRIPTA MATERIALIA
卷 154, 期 -, 页码 186-191出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.05.050
关键词
Amorphous alloys; Nanocomposites; Shear bands; Size effect
类别
资金
- Research Grant Council (RGC), the Hong Kong Government, through the General Research Fund (GRF) [CityU11207215]
- RGC-NSFC Joint Fund [N_CityU116/14]
- National Science Foundation of China (NSFC) [516711e21, 51520205001, 51601002]
- Fundamental Research Funds for the Central Universities [30917015107, 30916011106]
- National Natural Science Foundation of China (NSFC) [51571119]
Through detailed experimental and theoretical analyses, here we uncover the mechanism of plasticity initiation in the Ni-P nano-grained metallic glass (NGMG) which contains nano-sized hard amorphous inclusions and soft amorphous inter-granular regions. In this dual nano-phase amorphous structure, plasticity is mainly initiated through the elongation and coalescence of the amorphous nano-grains, resulting in a shear band much wider than in its monolithic counterpart. Consequently, the NGMG turns out to be softer at the microscopic scale. At the fundamental level, our finding provides a universal mechanism which explains the unusual strength weakening observed in a variety of dual nano-phase amorphous systems. (C) 2018 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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