期刊
FRONTIERS IN MATERIALS
卷 8, 期 -, 页码 -出版社
FRONTIERS MEDIA SA
DOI: 10.3389/fmats.2021.673574
关键词
multi-principal element alloys; machine learning; vacancy migration energies; vacancy formation energies; point defects
资金
- Energy Dissipation to Defect Evolution (EDDE), an Energy Frontier Research Center - United States Department of Energy, Office of Science, Basic Energy Sciences
Multi-principal element alloys consist of many principal elements randomly distributed on a crystal lattice, leading to large variations in point defect formation and migration energies. A machine learning framework is used to predict defect energies in these alloys based on a database of constituent binary alloys, enabling the design of alloys with tailored defect properties.
Multi-principal element alloys (MPEAs) are a new class of alloys that consist of many principal elements randomly distributed on a crystal lattice. The random presence of many elements lends large variations in the point defect formation and migration energies even within a given alloy composition. Compounded by the fact that there could be exponentially large number of MPEA compositions, there is a major computational challenge to capture complete point-defect energy phase-space in MPEAs. In this work, we present a machine learning based framework in which the point defect energies in MPEAs are predicted from a database of their constituent binary alloys. We demonstrate predictions of vacancy migration and formation energies in face centered cubic ternary, quaternary and quinary alloys in Ni-Fe-Cr-Co-Cu system. A key benefit of building this framework based on the database of binary alloys is that it enables defect-energy predictions in alloy compositions that may be unearthed in future. Furthermore, the methodology enables identifying the impact of a given alloying element on the defect energies thereby enabling design of alloys with tailored defect properties.
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