期刊
ACTA MATERIALIA
卷 185, 期 -, 页码 474-492出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2019.12.040
关键词
High entropy alloys; Elastic cyclic deformation; Martensitic transformation; Reversible dislocation movement; Dislocation structures
资金
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2016M3D1A1023383]
- Korea University
The present study contends with the room temperature microstructural response of a non-equiatomic metastable high entropy alloy to the elastic cyclic deformation. The stress and strain-induced martensite formation and reversion are recognized as the main microstructural evolutions which are directly correlated with the reversibility of dislocation movement. Two different patterns of reversion for deformation driven epsilon martensite are identified. Full reversion of stress-induced epsilon martensite results in development of nano-twined matrix, the various aspects of which have been described through a dislocation-based model. The strain-induced martensite also goes through partial reversion leading to lath fragmentation which in-turn significantly influences the martensite stability. Interestingly, the presence of a well-developed dislocation substructure is characterized within the martensite bands, which seems to be phenomenal owing to the low imposed strain, low temperature and low stacking fault energy of the experimented material. The development of vein and wall/channel structures is justified through proposing a conceptual based model regarding the interaction of the stacking faults and subsequent generation of the perfect dislocations. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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