China Nonferrous Metallurgy

TiAl-based alloys have excellent properties. However, due to the high price of titanium sponge, the preparation cost of TiAl-based alloys is high, which limits the application of TiAl-based alloys. In this paper，TiAl-M (Cr, Fe) alloy was prepared by one-step synthesis using TiO₂, Fe₂O₃, CrO₃ as raw materials and Al as reducing agent by aluminum thermal reduction method. The experimental results show that TiAl-Cr alloy can be separated from the reduced slag with good effect under the conditions of roasting temperature of 1550℃, Al/TiO₂=0.9, slag ratio of CaO∶Al₂O₃∶CaF₂=40%∶40%∶20% and roasting time of 30 min.The Cr element in the alloy can be regulated according to the amount of CrO₃ in the raw material.The alloy yield can reach up to 88%, Ti yield up to 92.4% and Cr yield up to 99.5%. The main phases of TiAl-Cr alloy are Ti₃Al and Al₈Cr₅. TiAl-Fe alloy is brittle, and the main phases of TiAl-Fe alloy are Ti₃Al and Al₆Fe.