We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Spinodal Decomposition of B2-phase and Formation of Cr-Rich Nano-precipitates in AlCoCrFeNi<sub>2.1</sub> Eutectic High-Entropy Alloy.
- Authors
Charkhchian, Javad; Zarei-Hanzaki, Abbas; Moshiri, Ali; Abedi, Hamid Reza; Schwarz, Tim M.; Lawitzki, Robert; Schmitz, Guido; Chadha, Kanwal; Aranas Jr, Clodualdo; Jiajia Shen; Oliveira, João Pedro
- Abstract
Herein, the occurrence of a B2-phase separation and formation of Cr-rich nanoprecipitates during the solidification process of AlCoCrFeNi2.1 eutectic highentropy 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 bodycentered cubic (BCC) phases. The presence of uniformly distributed Cr-rich nanoprecipitates 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.
- Subjects
ATOM-probe tomography; EUTECTICS; FACE centered cubic structure; GIBBS' free energy; CRITICAL temperature; TRANSMISSION electron microscopy; CHROMIUM alloys
- Publication
Advanced Engineering Materials, 2023, Vol 25, Issue 16, p1
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.202300164