TY - JOUR
T1 - Spinodal Decomposition of B2-phase and Formation of Cr-Rich Nano-precipitates in AlCoCrFeNi2.1 Eutectic High-Entropy Alloy
AU - Charkhchian, Javad
AU - Zarei-Hanzaki, Abbas
AU - Moshiri, Ali
AU - Abedi, Hamid Reza
AU - Schwarz, Tim M.
AU - Lawitzki, Robert
AU - Schmitz, Guido
AU - Chadha, Kanwal
AU - Aranas, Clodualdo
AU - Shen, Jiajia
AU - Oliveira, João Pedro
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50025%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50025%2F2020/PT#
Atom probe and electron microscopy experiments were supported by the German Research Foundation [Deutsche Forschungsgemeinschaft (DFG)] within the collaborative research center (CRC) 1333 (project number 358283783).
Also, the authors would like to gratefully acknowledge the kind support of Clodualdo Aranas, who the NSERC Discovery Grant supported by the Natural Sciences and Engineering Research Council of Canada (RGPIN 04006).
JS and JPO acknowledge Fundação para a Ciência e a Tecnologia (FCT‐MCTES) for its financial support via the project UID/00667/2020 (UNIDEMI).
JPO acknowledges funding by national funds from FCT‐Fundação para a Ciência e a Tecnologia, I.P., in the scope of the project LA/P/0037/2020 of the Associate Laboratory Institute of Nanostructures, Nanomodeling, and Nanofabrication–i3N. JS acknowledges the China Scholarship Council for funding the Ph.D. grant (CSC no. 201808320394).
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/8
Y1 - 2023/8
N2 - Herein, the occurrence of a B2-phase separation and formation of Cr-rich nano-precipitates during the solidification process of AlCoCrFeNi2.1 eutectic high-entropy alloy is addressed. Toward this end, various advanced characterizations, including high-resolution transmission electron microscopy and atom probe tomography combined with thermodynamic calculations, are employed. The as-solidified microstructure is composed of face-centered cubic (FCC) dendrites and interdendritic regions consisting of a eutectic mixture of FCC and body-centered cubic (BCC) phases. The presence of uniformly distributed Cr-rich nano-precipitates is traced through the BCC B2 phase in the interdendritic area. Regarding the occurrence of upward diffusion and Gibbs free energy variation, the formation of Cr-rich nano-precipitates is attributed to the spinodal decomposition where the critical temperature of 800 °C is passed behind during the solidification process. The formation of dense dislocation array in the interdendritic region due to thermal stress induced during solidification is introduced as a pathway for diffusion of alloying elements in the course of cooling stage.
AB - Herein, the occurrence of a B2-phase separation and formation of Cr-rich nano-precipitates during the solidification process of AlCoCrFeNi2.1 eutectic high-entropy alloy is addressed. Toward this end, various advanced characterizations, including high-resolution transmission electron microscopy and atom probe tomography combined with thermodynamic calculations, are employed. The as-solidified microstructure is composed of face-centered cubic (FCC) dendrites and interdendritic regions consisting of a eutectic mixture of FCC and body-centered cubic (BCC) phases. The presence of uniformly distributed Cr-rich nano-precipitates is traced through the BCC B2 phase in the interdendritic area. Regarding the occurrence of upward diffusion and Gibbs free energy variation, the formation of Cr-rich nano-precipitates is attributed to the spinodal decomposition where the critical temperature of 800 °C is passed behind during the solidification process. The formation of dense dislocation array in the interdendritic region due to thermal stress induced during solidification is introduced as a pathway for diffusion of alloying elements in the course of cooling stage.
KW - Cr-rich nano-precipitate
KW - eutectic high-entropy alloy
KW - phase separation
KW - spinodal decomposition
UR - http://www.scopus.com/inward/record.url?scp=85152902334&partnerID=8YFLogxK
U2 - 10.1002/adem.202300164
DO - 10.1002/adem.202300164
M3 - Article
AN - SCOPUS:85152902334
SN - 1438-1656
VL - 25
JO - Advanced Engineering Materials
JF - Advanced Engineering Materials
IS - 16
M1 - 2300164
ER -