Research effect of alloying elements al on heat resistance of Ti-V-Cr burn-resistant titanium alloy

Two Ti-V-Cr system burn-resistant titanium alloys of Ti-25V-15Cr-0.2Si and Ti-25V-15Cr-2Al-0.2Si were prepared. Their creep, thermal stability properties and microstructure were tested under different conditions. The result shows that Al strengthened the room-temperature mechanical properties and reduced the creep and thermal stability properties of Ti-V-Cr system burn-resistance alloys. The microstructures of two alloys only contained α phase and Ti₅Si₃ phase under the experiment condition, other transition phases and intermetallic compounds were not found. During creep and thermal exposure processes, the decrease of structure stability and much more precipitated phases are attributed to the effect of alloying element Al which caused the reduction of thermal stability and creep properties of Ti-V-Cr burn resistant titanium alloy.