期刊
SCIENCE ADVANCES
卷 6, 期 13, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aax4002
关键词
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资金
- Croucher Foundation [CityU 9500034]
- Research Grants Council of the Hong Kong Special Administrative Region [CityU 11215917]
- National Natural Science Foundation of China [51571170]
- Shenzhen Science and Technology Innovation Committee [JCYJ20170413140446951]
- Ministry of Science and Technology of China [2016YFA0401501]
High-entropy alloys exhibit exceptional mechanical properties at cryogenic temperatures, due to the activation of twinning in addition to dislocation slip. The coexistence of multiple deformation pathways raises an important question regarding how individual deformation mechanisms compete or synergize during plastic deformation. Using in situ neutron diffraction, we demonstrate the interaction of a rich variety of deformation mechanisms in high-entropy alloys at 15 K, which began with dislocation slip, followed by stacking faults and twinning, before transitioning to inhomogeneous deformation by serrations. Quantitative analysis showed that the cooperation of these different deformation mechanisms led to extreme work hardening. The low stacking fault energy plus the stable face-centered cubic structure at ultralow temperatures, enabled by the high-entropy alloying, played a pivotal role bridging dislocation slip and serration. Insights from the in situ experiments point to the role of entropy in the design of structural materials with superior properties.
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