Journal
SMALL
Volume 17, Issue 42, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202102972
Keywords
machine learning; molecular dynamic simulations; multi-objective optimization; multiprincipal element alloys
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By integrating molecular dynamics simulation, machine learning algorithms, and genetic algorithms, researchers have developed an efficient design strategy for MPEAs, successfully predicting optimal compositions of CoNiCrFeMn alloys with high stiffness and critical resolved shear stress.
Multiprincipal element alloys (MPEAs) have gained surging interest due to their exceptional properties unprecedented in traditional alloys. However, identifying an MPEA with desired properties from a huge compositional space via a cost-effective design remains a grand challenge. To address this challenge, the authors present a highly efficient design strategy of MPEAs through a coherent integration of molecular dynamics (MD) simulation, machine learning (ML) algorithms, and genetic algorithm (GA). The ML model can be effectively trained from 54 MD simulations to predict the stiffness and critical resolved shear stress (CRSS) of CoNiCrFeMn alloys with a relative error of 2.77% and 2.17%, respectively, with a 12 600-fold reduction of computation time. Furthermore, by combining the highly efficient ML model and a multi-objective GA, one can predict 100 optimal compositions of CoNiCrFeMn alloys with simultaneous high stiffness and CRSS, as verified by 100 000 ML-accelerated predictions. The highly efficient and precise design strategy can be readily adapted to identify MPEAs of other principal elements and thus substantially accelerate the discovery of other high-performance MPEA materials.
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