Abstract
Cr segregation at grain boundary (GB) of Multi-principal element alloys (MPEAs) is extensively observed and holds significance in physical processes, e.g., oxidation, but its atomic-level mechanism is still debated. Here, correlations among atomic-level volume, electronegativity, charge transfer, and atomic stress, are systematically investigated in equiatomic CrFeCoNi alloys, both with and without GBs. The correlations slightly disturbed in GBs inadequately elucidate the discrepancy of Cr short range ordering (SRO) in the interior grain and at GBs. High excess free volume inherent in GBs, distinguishing from the interior, is a crucial factor, driving Cr enrichment by means of the mitigation of electron loss and the alleviation of very high tensile stress. The stress mechanism in conjunction with the electronegativity of element and the characteristics of GB structure, not only adapts to Cr segregation in CrFeCoNi, but also to other element of low electronegativity within considered alloys.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
