Non-classical nucleation of ordered L12 precipitates in the FCC based Al0.25CoFeNi high entropy alloy
| hal.structure.identifier | Department of Materials Science and Engineering | |
| dc.contributor.author | DASARI, Sriswaroop | |
| hal.structure.identifier | Department of Materials Science and Engineering | |
| dc.contributor.author | SHARMA, Abhishek | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GORSSE, Stéphane | |
| hal.structure.identifier | Department of Materials Science and Engineering | |
| dc.contributor.author | CHESETTI, Advika | |
| hal.structure.identifier | Department of Materials Science and Engineering | |
| dc.contributor.author | BANERJEE, Rajarshi | |
| dc.date.issued | 2023 | |
| dc.identifier.issn | 0021-8979 | |
| dc.description.abstractEn | The complex interplay between competing phase stabilities of FCC, L12, BCC, and B2 phases in the Al0.25CoFeNi (7Al-31Co-31Fe-31Ni in at%) high entropy alloy (HEA), leads to non-classical phase transformation pathways and resultant novel microstructures. Specifically, the competition between homogenous precipitation of L12 and heterogenous precipitation of BCC/B2 can be studied at a temperature of 500 o C in Al0.25CoFeNi alloy. Upon isothermally annealing the single FCC phase microstructure of this HEA at 500 o C up to 50 hours, the transformation initiates with the formation of a transient ordered L12 phase with minor Ni-Al enrichment, which is far-from equilibrium, as revealed by atom probe tomography, and can be considered as non-classical nucleation. The near equilibrium L12 phase eventually replaces the transient L12 during continued annealing at the same temperature. However, the resultant FCC+L12 microstructure is metastable because the true equilibrium for the Al0.25CoFeNi alloy at 500°C is a mixture of L12+B2 phases, as revealed by solution thermodynamics modeling. The higher nucleation barrier for the BCCbased ordered B2 phase coupled with the slower kinetics at 500 o C, leads to the homogeneous precipitation of L12, while the B2 phase appears to sluggishly grow from grain boundaries acting as heterogeneous nucleation sites. | |
| dc.language.iso | en | |
| dc.publisher | American Institute of Physics | |
| dc.subject.en | High entropy alloy | |
| dc.subject.en | Phase transformation pathway | |
| dc.subject.en | Non-classical nucleation | |
| dc.subject.en | Ordered L12 | |
| dc.subject.en | Ordered B2 | |
| dc.subject.en | Phase transitions | |
| dc.subject.en | Superlattices | |
| dc.subject.en | Crystallographic defects | |
| dc.subject.en | Crystallography | |
| dc.subject.en | Alloys | |
| dc.subject.en | Annealing | |
| dc.subject.en | Tomography | |
| dc.subject.en | Transmission electron microscopy | |
| dc.subject.en | Nanodomains | |
| dc.title.en | Non-classical nucleation of ordered L12 precipitates in the FCC based Al0.25CoFeNi high entropy alloy | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1063/5.0138924 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Applied Physics | |
| bordeaux.page | 015102 | |
| bordeaux.volume | 134 | |
| bordeaux.issue | 1 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-04160302 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-04160302v1 | |
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