期刊
MATERIALS RESEARCH LETTERS
卷 6, 期 9, 页码 495-500出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2018.1482839
关键词
High-entropy bulk metallic glasses; thermal stability; glass-forming ability; viscosity; fragility
资金
- National Natural Science Foundation of China [11790293, 51422101, 51531001, 51671018, 51671021, U1530402]
- 111 Project [B07003]
- International Science and Technology Cooperation Program of China [2015DFG52600]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT_14R05]
- Projects of State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing [2015-ZD05, 2016Z-04, 2016-09, 2016Z-16]
It is generally accepted that good glass formers have a high thermal stability against crystallization upon heating. In this paper, we report an unusual relationship between thermal stability and glass-forming ability (GFA) for high-entropy bulk metallic glasses (HE-BMGs). As compared with their conventional counterparts in the same alloy system, the HE-BMGs have a lower energy barrier for atomic diffusion during undercooling, which facilitates crystallization and then reduces the GFA. Our results clearly demonstrate that the GFA of BMGs is governed by the kinetics of the under-cooled liquid, whilst their thermal stability is controlled by atomic diffusion in the glass-transition regime. [GRAPHICS] IMPACT STATEMENT The undercooled liquid behavior of HE-BMGs plays a key role in determining glass formation, but the thermal stability is controlled by the atomic rearrangement in glassy solid state.
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