期刊
ADVANCED ENGINEERING MATERIALS
卷 23, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202000848
关键词
face-centered-cubic crystals; high-entropy alloys; microstructures; segregations; tensile properties
资金
- National Natural Science Foundation of China [51901114, 51971099]
- Natural Science Foundation of Jiangsu Province [BK20190210]
- Qilu Young Scholar Program in Shandong University
The study investigates the microstructure evolution, phase constituents, and tensile properties of Mn-Fe-Co-Ni-Cu HEA system. The alloys exhibit good strengths, large elongations, and work hardening capability, primarily attributed to the precipitation strengthening by Cu-rich particles.
High-entropy alloys (HEAs) with face-centered-cubic (FCC) structures, e.g., the typical CrMnFeCoNi HEA, have a strong tendency to precipitate brittle sigma phases, as Cr is a strong sigma stabilizer. To develop HEAs with alleviated concerns of sigma phases, Cu for Cr in the Cr-Mn-Fe-Co-Ni HEA system is substituted to form a Mn-Fe-Co-Ni-Cu system. The quinary alloy and its quaternary subsets are investigated all in as-cast state. Microstructure evolution, phase constituent, and tensile properties at room temperature are studied. The HEAs have multi-phase FCC structures with slightly different lattice constants and spherical Cu-rich particles are observed in most systems. All alloys exhibit dendrite-like morphology with Cu segregation in interdendritic regions due to the solute partitioning. The investigated HEAs show good strengths, large elongations, and work hardening capability. The strengths are attributed to combined mechanisms, especially the precipitation strengthening by Cu-rich particles. The findings provide some model HEA systems for further usefully guiding design in the widely compositional space of Cr-free HEAs.
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