Effect of the Al, Cr and B elements on the mechanical properties and oxidation resistance of Nb-Si based alloys: a review

Nb-Si based alloys are considered as a potential candidates to substitute for Ni-based super alloys. However, its poor mechanical properties and high temperature oxidation resistance greatly limit its development and application. Alloying can effectively improve the mechanical properties and oxidation resistance of Nb-Si based alloy. In this work, the effects of Al, Cr, B elements addition on the mechanical properties and oxidation resistance of niobium-silicon ternary alloys are summarized. The microstructure, oxidation behavior and mechanical properties of various alloys were analyzed and compared. Moreover, the fracture and oxidation failure mechanism of the alloys are also summarized. Finally, the development trend of ternary Nb-Si based oxidation-resistant alloys in the future has been prospected.

Automated summary

This study summarizes the effects of Al, Cr, B elements addition on the mechanical properties and oxidation resistance of niobium-silicon ternary alloys, analyzes and compares the microstructure, oxidation behavior and mechanical properties of various alloys, and summarizes the fracture and oxidation failure mechanisms of the alloys. Additionally, it provides a prospect for the future development trend of ternary Nb-Si based oxidation-resistant alloys.