期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 128, 期 11, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-022-06101-y
关键词
Phase-field method; Phase separation; Cu-enriched precipitate; Elastic lattice misfit; High-entropy alloys
资金
- National Natural Sciences Foundation of China [U2067220, 82000980]
- LingChuang Research Project of China National Nuclear Corporation
- Young Talent Project of China National Nuclear Corporation
This study utilizes a phase-field model and thermodynamic databases to explore the microstructural evolution in multi-principal element alloys. The simulated results reveal a complex core-shell structure in the Cu-enriched phase, with a retardant effect from the Ni/Fe shell. High Ni/Fe concentration delays the growth and coarsening of the Cu-enriched phase, while high temperature accelerates these processes.
The simulation of microstructural evolution in multi-principal element alloys is still challenging although for alloy development it is of high importance. In the work, a phase-field model linked with CALPHAD thermodynamic databases is utilized to explore the microstructural evolution during diffusion-controlled phase separation in the Fe-Ni-Cr-Co-Cu high-entropy alloy system with elastic lattice misfit. The compositional fluctuation and temperature effect on the elemental distribution and the kinetics of Cu-enriched phase formation are systematically investigated. The simulated results show that the Cu-enriched phase has a complicated core-shell structure consisting of a Cu-enriched core and a Ni/Fe shell. The latter as a buffer layer possesses retardant effect on the formation of Cu-enriched precipitates. Furthermore, the high Ni/Fe concentration delays the phase separation, growth and coarsening of the Cu-enriched phase, leading to particle refinement and the increasing width of the Ni/Fe shell. Besides, high temperature accelerates the phase separation and simultaneously promotes the growth and coarsening of nanoscale Cu-enriched precipitates. The present work expands the knowledge of phase separation in multicomponent alloy systems and provides insights to optimize material microstructure and properties.
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