Journal
HIGH PRESSURE RESEARCH
Volume 39, Issue 4, Pages 533-546Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08957959.2019.1653865
Keywords
High-entropy alloys; phase transition; Diamond anvil cell; high pressure; X-ray diffraction
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Funding
- National Natural Science Foundation of China [11504354]
- Chinese Academy of Sciences [11474281, KJCX2-SWN03, KJCX2-SW-N20]
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High-entropy alloys (HEAs) attract growing interest due to their remarkable properties. However, our knowledge of the mechanism of phase stability of HEAs is still very limited. Herein, CoCrFeNixAl1-x (x = 0.5 and 0.75) were compressed to high pressures to investigate the lattice distortion effect on their phase stability. It was discovered that both bcc CoCrFeNi0.5Al0.5 and fcc CoCrFeNi0.75Al0.25 alloys transform to the hcp structure at high pressures, following a gradual phase transition. The sluggish character of these transitions perhaps originates from the local energy fluctuations caused by the chemical disorder. The phase transitions in both studied compounds commenced when their intrinsic lattice strain had reached the maximum value, indicating that the lattice distortion effect plays a key role in these crystallographic structure-transforming processes. These results provide fundamental information on the phase selection rules of HEAs, which are important for physical metallurgy theories and HEAs design in the future.
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