Comprehensive analysis of ordering in CoCrNi and CrNi2 alloys

Vinícius P. Bacurau (), Pedro A. F. P. Moreira, Gustavo Bertoli, Angelo F. Andreoli, Eric Mazzer, Flávio F. Assis, Piter Gargarella, Guilherme Koga, Guilherme C. Stumpf, Santiago J. A. Figueroa, Michael Widom, Michael Kaufman, Andrea Fantin, Yifan Cao, Rodrigo Freitas, Daniel Miracle and Francisco G. Coury ()
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Vinícius P. Bacurau: Federal University of São Carlos
Pedro A. F. P. Moreira: Federal University of São Carlos
Gustavo Bertoli: Federal University of São Carlos
Angelo F. Andreoli: Federal University of São Carlos
Eric Mazzer: Federal University of São Carlos
Flávio F. Assis: Federal University of São Carlos
Piter Gargarella: Federal University of São Carlos
Guilherme Koga: Federal University of São Carlos
Guilherme C. Stumpf: Federal University of São Carlos
Santiago J. A. Figueroa: Center for Research in Energy and Materials (CNPEM)
Michael Widom: Carnegie Mellon University
Michael Kaufman: Colorado School of Mines
Andrea Fantin: Federal Institute for Materials Research and Testing
Yifan Cao: Massachusetts Institute of Technology
Rodrigo Freitas: Massachusetts Institute of Technology
Daniel Miracle: Materials and Manufacturing Directorate
Francisco G. Coury: Federal University of São Carlos

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Chemical Short-Range Order (CSRO) has attracted recent attention from many researchers, creating intense debates about its impact on material properties. The challenges lie in confirming and quantifying CSRO, as its detection proves exceptionally demanding, contributing to conflicting data in the literature regarding its true effects on mechanical properties. Our work uses high-precision calorimetric data to unambiguously prove the existence and, coupled with atomistic simulations, quantify the type of CSRO. This methodology allows us to propose a mechanism for its formation and destruction based on the heat evolution during thermal analysis and facilitates a precise identification of local ordering in CoCrNi alloys. Samples of CoCrNi (Co33Cr33Ni33) and CrNi2 (Cr33Ni66) alloys are fabricated in varying ordered states, extensively characterized via synchrotron X-ray diffraction, X-ray absorption spectroscopy, and transmission electron microscopy. Samples with considerably different ordered states are submitted to tensile tests with in-situ synchrotron X-ray diffraction. We demonstrate, despite inducing varied CSRO levels in CoCrNi, no significant alterations in overall mechanical behavior emerge. However, the CrNi2 alloy, which undergoes long-range ordering, experiences significant shifts in yield strength, ultimate tensile stress and ductility.

Date: 2024
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DOI: 10.1038/s41467-024-52018-w

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