Secondary phases effects on microstructure and mechanical properties of lanthanum-doped titanium‑zirconium‑molybdenum alloy

Abstract The size of the secondary phases affects the lanthanum-doped titanium‑zirconium‑molybdenum (La-TZM) alloy properties. In this study, the microstructure and mechanical properties of the La-TZM alloys were regulated by adding carbon and Ti/Zr elements, which resulted in different secondary phase characteristics. Adding nano-TiC and ZrC decreased the micron secondary phase size of the La-TZM alloy by 26.7%, and increased the yield strength by 27%, reaching 1239 MPa. The effects of secondary phase size and distribution on yield strength were analyzed. This study contributes to the design and theoretical analysis of new molybdenum alloys.