Machine Learning Vacancy Formation Energy in Nickel-Based Superalloys

Creep performance plays a key role in nickel-based superalloys for high temeprature applications. Creep behavior depends on many parameters such as strength, dislocations, diffusivity, and microstructural stability in addition to temeprature, applied stress, and oxidation. This work focuses on predicting vacancy formation energy in nickel-based superalloys using machine learning approach. High-throughput density functional theory (DFT) calculations are performed on Ni-based alloys with the addition of various alloying elements to predict the vacancy formation energy and vacancy concentration. Machine learning is performed using various models including graph neural networks.. Authors: Sundar, Aditya [NETL Site Support Contractor, National Energy Technology Laboratory]; San, Saro [NETL Site Support Contractor, National Energy Technology Laboratory]; Gao, Michael [NETL] (ORCID:000000020515846X). DOE Contract: NONE. Subjects: creep performance; nickel superalloy; vacancy