期刊
出版社
ELSEVIER SCIENCE SA
关键词
Dislocation; High-entropy alloys; Mechanical properties; Stacking fault; Twinning
类别
资金
- National Key Research and Development Program of China [2019YFA0209901, 2018YFA0702901, 2017YFA0403803]
- Special Fund for Research on National Major Research Instrument [51927801]
- State Key Laboratory of Solidification Processing in NWPU [SKLSP201902]
- Liao Ning Revitalization Talents Program [XLYC1807047]
- National MCF Energy RD Program [2018YFE0312400]
- Fund of Science and Technology on Reactor Fuel and Materials Laboratory [STRFML-2020-04]
Nonequiatomic Co29Cr29Fe29Ni12.5W0.5 high-entropy alloys exhibited outstanding mechanical properties after annealing at 725 degrees C, attributed to the addition of the W element and ultrafine grain structure. Dislocation slip, stacking faults, and nano-twins governed the deformation mechanism in the annealed alloy.
Nonequiatomic Co29Cr29Fe29Ni12.5W0.5 high-entropy alloys (HEAs) were prepared by vacuum induction melting and subsequent mechanical processing. The HEA with face-centered cubic and few hexagonal close-packed structure phases exhibited outstanding mechanical properties. After annealing at 725 degrees C, the yield strength and fracture elongation were 1.13 GPa and 24.3%, respectively. The outstanding mechanical properties were attributed to the addition of the W element and ultrafine grain structure. The results demonstrated that dislocation slip, stacking faults, and nano-twins governed the deformation mechanism, and these defects were responsible for the decrease in the work-hardening rate during the deformation processing in the 725 degrees C-annealed alloy.
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