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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Melting behavior and globular microstructure formation in semi-solid CoCrCuxFeNi high-entropy alloys

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Author(s):
Campo, Kaio Niitsu [1] ; de Freitas, Caio Chausse [1] ; Fanton, Leonardo [1] ; Caram, Rubens [1]
Total Authors: 4
Affiliation:
[1] Univ Estadual Campinas, Sch Mech Engn, Campinas, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY; v. 52, p. 207-217, SEP 1 2020.
Web of Science Citations: 1
Abstract

High-entropy alloys can be compelling raw materials for semi-solid applications. In the present study, the influence of the Cu content on the melting behavior and semi-solid microstructure of CoCrCuxFeNi (x = 0, 1, 2, 3) alloys was investigated. Arc-melted samples were cross-rolled at room temperature and then isothermally treated at 1175 degrees C in the semi-solid state for 300 s. Microstructural characterization showed that the alloys containing Cu were formed by two fcc phases. Notably, the increase in Cu content also led to an increase in the volumetric fraction of the Cu-rich phase. During solidification, this phase, which is the last to form, nucleates and epitaxially grows on the Cu-lean phase. All the studied CoCrCuFeNi alloys exhibited the same melting behavior. The Cu-rich phase melts at approximately 1120 degrees C, whereas the Cu-lean phase melts at approximately 1350 degrees C, providing a suitable processing temperature range of more than 200 degrees C. The semi-solid microstructures were considerably refined and globular regardless of the alloy composition, being suitable for semi-solid processing. Furthermore, each fcc phase exhibited roughly the same composition under the different processing conditions. The Cu content in the Cu-lean phase was approximately 10 at.%, while Co, Cr, Fe, and Ni were in an approximately equiatomic ratio. Meanwhile, the Cu content was between 80 at.% and 86 at.% in the Cu-rich phase. The isothermal treatment of the CoCrCu3FeNi alloy at a higher temperature (1300 degrees C) only caused the globules to coarsen. In conclusion, this work showed that these alloys can be potential candidates for semi-solid processing. (C) 2020 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science \& Technology. (AU)

FAPESP's process: 18/10190-5 - Design and Semisolid Processing of High-Entropy Alloys Based on the CrCuFeMnNi System
Grantee:Kaio Niitsu Campo
Support type: Scholarships in Brazil - Post-Doctorate