期刊
ENTROPY
卷 20, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/e20120900
关键词
solid-solution alloys; lattice distortion; phase transformation
资金
- Energy Dissipation to Defect Evolution (EDDE), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy of Sciences [DE-AC05-00OR22725]
- National Science Foundation [DMR-1332208]
- National Institutes of Health/National Institute of General Medical Sciences under NSF award [DMR-1332208]
- National Science Foundation - Earth Sciences [EAR - 1634415]
- Department of Energy-GeoSciences [DE-FG02-94ER14466]
- DOE Office of Science [DE-AC02-06CH11357]
In the present study, we have revealed that (NiCoFeCr)(100-x)Pd-x (x= 1, 3, 5, 20 atom%) high-entropy alloys (HEAs) have both local- and long-range lattice distortions by utilizing X-ray total scattering, X-ray diffraction, and extended X-ray absorption fine structure methods. The local lattice distortion determined by the lattice constant difference between the local and average structures was found to be proportional to the Pd content. A small amount of Pd-doping (1 atom%) yields long-range lattice distortion, which is demonstrated by a larger (200) lattice plane spacing than the expected value from an average structure, however, the degree of long-range lattice distortion is not sensitive to the Pd concentration. The structural stability of these distorted HEAs under high-pressure was also examined. The experimental results indicate that doping with a small amount of Pd significantly enhances the stability of the fcc phase by increasing the fcc-to-hcp transformation pressure from 13.0 GPa in NiCoFeCr to 20-26 GPa in the Pd-doped HEAs and NiCoFeCrPd maintains its fcc lattice up to 74 GPa, the maximum pressure that the current experiments have reached.
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