Steady state flow of the FeCoNiCrMn high entropy alloy at elevated temperatures |
| |
| Affiliation: | 1. State Key Laboratory for Advance Metals and Materials, University of Science and Technology, Beijing 10083, People''s Republic of China;2. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, USA;1. Materials Science and Engineering Department, University of Tennessee, Knoxville, TN 37996, USA;2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;1. Department of Materials Physics, Montanuniversität Leoben, 8700 Leoben, Austria;2. Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, 8700 Leoben, Austria;3. Formerly at the Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;4. Materials Science and Engineering Department, University of Tennessee, Knoxville, TN 37996, USA;5. Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700 Leoben, Austria;1. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;2. Materials Science and Engineering Department, University of Tennessee, Knoxville, TN 37996, USA;1. Applied Materials Physics, Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm SE-100 44, Sweden;2. Department of Physics, University of Science and Technology Beijing, Beijing 100083, China;3. Sandvik Coromant R&D, 126 80 Stockholm, Sweden;4. Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Box 516, SE-75120 Uppsala, Sweden;5. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary;1. Belgorod State University, 85 Pobeda Str, Belgorod 308015, Russia;2. National Science Center, Kharkov Institute of Physics and Technology, 1 Akademicheskaya Str, Kharkov 61108, Ukraine;1. Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, India;2. Department of Materials Science and Engineering, Kyoto University, Japan;3. Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Japan;4. Advanced Steel Processing and Products Research Center (ASPPRC), Colorado School of Mines, USA |
| |
| Abstract: | Steady state flow behavior of the FeCoNiCrMn high-entropy alloy at temperatures ranging from 1023 to 1123 K was systematically characterized. It was found that the stress exponent (i.e., the reciprocal of strain-rate sensitivity) was dependent on the applied strain rate, and specifically the stress exponent is high (∼5) in the high strain rate regime, but decreases with decreasing strain rate. Microstructural examinations of the samples before and after deformation were performed to understand the interplay of the microstructures with the corresponding properties. Based on the observations, it was proposed that, at high strain rates, the deformation of the current high-entropy alloy was controlled by dislocation climb and the rate limiting process was the diffusion of Ni. At low strain rates, however, the deformation appeared to be controlled by the viscous glide of dislocations. Moreover, at the slowest strain rate (i.e., the longest thermal exposure time), new phases evolved, which caused elemental redistribution and weakening of the material. |
| |
| Keywords: | A. High–entropy alloys B. Mechanical properties B. Phase stability D. Microstructure F. Mechanical testing |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
