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Multiscale-phase-driven strength-ductility synergy in Fe3Cr2CoNiAlx high entropy alloys
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DOI：10.1016/j.intermet.2023.107865.png)
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Abstract
En 中文
Fe3Cr2CoNiAlx (x = 0.6, 0.7, 0.8, 1.0, 1.1, 1.2) high entropy alloys (HEAs) with dual-scales B2 precipitated were prepared. The microstructure changed from face-centered-cubic (FCC) and body-centered-cubic (BCC) to a single BCC structure with the increasing of Al content. By controlling the concentration of Al element in the BCC-based HEAs, the structure can be tuned to two coherent BCC phases: medium B2 (m-B2) precipitates with an average length of 200-300 nm and smaller size B2 (s-B2) precipitates with an average diameter of 10-50 nm. The compression tests indicated that the Fe3Cr2CoNiAl1.2 HEA exhibited excellent compression properties, which yield strength and fracture strain is 1464 MPa and 20%, respectively. Furthermore, the strengthening mechanism has been discussed, and it is determined that the main strengthening mechanism was precipitation strengthening. This work provides a useful mean by tailoring multi-scale phase to achieve excellent properties in BCC-based high entropy alloys.
Keywords:
High entropy alloys
Coherent precipitates
Microstructural evolution
Strengthen mechanism
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