Microstructure and properties of burn-resistant Ti-Al-Cu alloys

Ti-Al-Cu series burn-resistant alloys are newly developed materials which h ave low density, low cost and are easy to process. The results show that Ti -Al-Cu alloys have good burn resistance due to their good thermal conductiv ity, low melting point, and the existence of Ti2Cu phase which also has a v ery low melting point. Ti-Al-Cu alloys have excellent thermal processabilit y and good room and high temperature tensile properties, but an increase in copper content harms their thermal stability. After thermal exposure for a long time, Ti2Cu phase will coalesce and coarsen, but the addition of Si a nd Al will be useful for their thermal stability. The Ti-13Cu-1Al-0.2Si all oy has good thermal stability at 540 degreesC and good creep resistance at 300 degreesC and 100 MPa. The phases of Ti-Al-Cu alloys were found to be co mposed of alpha phase and Ti2Cu. The character of the Ti2Cu phase changes w ith the increasing copper content.