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Title: A Modified Embedded-Atom Method Potential for a Quaternary Fe-Cr-Si-Mo Solid Solution Alloy

Journal Article · · Materials
DOI:https://doi.org/10.3390/ma16072825· OSTI ID:1968068

Ferritic-martensitic steels, such as T91, are candidate materials for high-temperature applications, including superheaters, heat exchangers, and advanced nuclear reactors. Considering these alloys’ wide applications, an atomistic understanding of the underlying mechanisms responsible for their excellent mechano-chemical properties is crucial. Here, we developed a modified embedded-atom method (MEAM) potential for the Fe-Cr-Si-Mo quaternary alloy system—i.e., four major elements of T91—using a multi-objective optimization approach to fit thermomechanical properties reported using density functional theory (DFT) calculations and experimental measurements. Elastic constants calculated using the proposed potential for binary interactions agreed well with ab initio calculations. Furthermore, the computed thermal expansion and self-diffusion coefficients employing this potential are in good agreement with other studies. This potential will offer insightful atomistic knowledge to design alloys for use in harsh environments.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AR0001066
OSTI ID:
1968068
Journal Information:
Materials, Journal Name: Materials Vol. 16 Journal Issue: 7; ISSN 1996-1944
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Switzerland
Language:
English

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