期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 911, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165108
关键词
High entropy alloy (HEA); Deformation; Mechanical twinning; Strain-induced martensite; Friction stress; Stacking fault energy (SFE)
资金
- National Research Foundation of Korea (NRF) [2019R1A2C208838413]
- Brain Pool Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2019H1D3A1A01102813]
- Future Material Discovery Program of the National Research Foundation of Korea (NRF) - Ministry of Science and ICT of Korea [2016M3D1A102353223]
- National Research Foundation of Korea [2019H1D3A1A01102813] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study investigated the effects of carbon and molybdenum on the strain-induced nanostructural evolution and strength-ductility trade-off in Fe40Mn40Co10Cr10, Fe39.5Mn40Co10Cr10C0.5, and Fe38.3Mn40Co10Cr10Mo1.7 high-entropy alloys at different temperatures. The addition of molybdenum enhanced the metastability and volume fraction of epsilon-martensite in Fe38.3Mn40Co10Cr10Mo1.7 at cryogenic temperature. The fraction of annealing twins played a significant role in the nanostructural evolution and grain refinement of Fe38.3Mn40Co10Cr10Mo1.7. By modifying the alloy composition, the nanostructural evolution was controlled through changes in stacking fault energy, friction stress for cross slip, and Gibbs free energy for phase transformation.
The effects of carbon and molybdenum on the strain-induced nanostructural evolution and strength-ductility trade-off in Fe40Mn40Co10Cr10, Fe39.5Mn40Co10Cr10C0.5, and Fe38.3Mn40Co10Cr10Mo1.7 high-entropy alloys (HEAs) were investigated at room temperature (RT) and cryogenic temperature (CT). Deformation twinning was the dominant deformation mechanism for all the three HEAs at RT. The addition of Mo enhanced the metastability and thus increase the volume fraction of epsilon-martensite with strain in Fe38.3Mn40Co10Cr10Mo1.7 at 77 K. The fractions of annealing twins played important roles in the nanostructural evolution and grain refinement of the Fe38.3Mn40Co10Cr10Mo1.7 at CT. The nanostructural evolution was found to be controlled by modifying SFE, the friction stress for cross slip and Gibbs free energy for phase transformation (Delta Gfcc-hcp) via alloying with Mo or C. The nucleation of mechanical twinning at RT and the preferential occurrence of strain-induced martensitic transformation at CT was found to induce the grain partitioning through the hierarchical structure formation and enhanced work hardening rate. The simultaneous occurrence and synergistic effect of twinning-induced plasticity/transformation-induced plasticity in Fe39.5Mn40Co10Cr10C0.5 exhibited an excellent strength/ductility combination (1022 MPa/similar to 110%) at 77 K. (c) 2022 Elsevier B.V. All rights reserved.
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