Influence of rare earth oxides on microstructure and mechanical properties of nickel-based superalloys fabricated by high energy beam processing: A review

Review article, 2024

In this paper, the effects of rare earth oxides on the microstructure and mechanical properties of nickel-based superalloys prepared by high-energy beam processing technology were critically studied. The focus is on the optimal amount of rare earth oxides that can produce ideal results. Special attention was paid to their main strengthening mechanisms, including solid solution strengthening mainly in the form of solid solution dissolved in the nickel-based alloy and improving the microstructure of the alloy by grain refinement or fine grain strengthening produced by homogenizing the distribution phase. Y2O3, La2O3 and CeO2 rare earth oxides can also improve the fluidity of the alloy molten pool and reduce the segregation of alloying elements. These advantages can significantly improve the mechanical properties of the alloy. Thereafter, this paper outlines the future research directions of rare earth oxides, aiming to expand their application potential.