Journal
INTERMETALLICS
Volume 93, Issue -, Pages 93-100Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2017.11.019
Keywords
High entropy alloy; Alloy design; Crystal growth; Microstructure; Transmission electron microscopy (TEM)
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Funding
- National Natural Science Foundation of China [51604222, 51401160, 51504191]
- China Postdoctoral Science Foundation [152064]
- Fund of the State Key Laboratory of Solidification Processing in NWPU [SKLSP201310]
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The high-entropy-alloy Al0.7CoCrFeNi (molar ratio) was prepared by vacuum arc melting followed by directional solidification (DS) with < 001 > oriented seed. The unique lamellar-dendrite microstructure was obtained over a wide cooling rate range. During solidification, Fe and Co are prone to segregate to the dendrite, while Cr and Al segregate to interdendrite. The solute pile-up of Cr and Al at the solid/liquid interface leads to the dendritic solidification. During the following cooling process, the BCC phase precipitates from the FCC dendrite to form the lamellar structure, while the ordered B2 phase precipitates from the interdendrite. Moreover, the lamellar spacing is significantly refined with increasing cooling rate, resulting in the higher hardness and compressive yield strength. Directional solidification is proved to be an efficient way to improve the mechanical properties of multi-phases high-entropy alloys.
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