| Title: |
On the precipitation during age hardening of CoCrFeMnNi with Al and Ti additions |
| Authors: |
Hilhorst, Antoine; Miotti Bettanini, Alvise; Callahan, Mike; Jacques, Pascal J. |
| Contributors: |
UCL - SST/IMMC/IMAP - Materials and process engineering |
| Source: |
Journal of Alloys and Compounds, Vol. 1050, no./, p. 185757 (2026) |
| Publisher Information: |
Elsevier BV |
| Publication Year: |
2026 |
| Collection: |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
| Subject Terms: |
High entropy alloys; Precipitation Hardening; Alloy design |
| Description: |
High entropy alloys (HEAs) based on Co-Cr-Fe-Mn-Ni transition metals with Al and Ti additions constitute a versatile system to generate complex microstructures. In this study, microstructures consisting of a ductile FCC matrix with hard BCC, sigma, and fine precipitates are obtained after thermo-mechanical treatments by varying the amounts of Al and Ti, specifically (CoCrFeMnNi)100-x(Al2Ti)x, x=6, 8, 10. Ageing is performed in the range of 650 to 850°C up to 160 hours. Additionally, the effect of ageing is compared between as-cold-rolled state and after solution treatment. Bulk hardness values ranges from 300 to 600 HV due to the precipitation of a (Cr, Fe, Mn)-rich sigma phase and a (Co, Ni, Al, Ti)-rich BCC phase, as characterized by nanoindentation, EBSD, and STEM. A higher content of Al/Ti increases the volume fraction of secondary phases, increasing hardness. During ageing, precipitation occurs in three stages with first the precipitation of a BCC secondary phase, second the concurrent precipitation of sigma and BCC phases, and third the formation of needle-like BCC precipitates. L12 precipitates have not been observed in the range of compositions and heat treatments investigated. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
info:eu-repo/grantAgreement/FNRS/Chargé de Recherche/MecaTwin; info:eu-repo/grantAgreement/Région Wallone/WallInnov 2016/Entrotough; info:eu-repo/grantAgreement/FNRS/GEQ/; boreal:309993; https://hdl.handle.net/2078.1/309993 |
| DOI: |
10.1016/j.jallcom.2025.185757 |
| Availability: |
https://hdl.handle.net/2078.1/309993; https://doi.org/10.1016/j.jallcom.2025.185757 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.BE72274D |
| Database: |
BASE |