REVIEW OF THE INVESTMENT CASTING OF TiAI-BASED INTERMETALLIC ALLOYS

Abstract

TiAl-based intermetallic alloys are emerging as a new generation light-weight, high temperature structural materials and possess wide capacities of engineering applications in aeronautics, space and automobile industries. Near-net-shape casting is a commonly used manufacturing method for TiAl-based alloys. In this paper, the evolution of the alloy design and investment casting technology of TiAl-based alloys are reviewed. The prospects of the investment casting of TiAl-based alloys are also represented.

Welding and Joining of Titanium Aluminides

“…Titanium aluminides have attracted great interest due to their high melting point, low density, high elastic ratio and good oxidation resistance [ 1 , 2 , 3 ]. Furthermore, intensive activity has been reported on the research and development of advanced titanium aluminides for high temperature structural applications during the last two decades [ 4 , 5 , 6 ].…”

Recent research and development of mould materials for casting TiAl alloys

“…TiAl alloy components can be fabricated by casting method not only with low cost but also with more complicated shape [15][16][17]. Especially, investment casting method is one of the effective way for manufacturing near-net forming parts of TiAl alloys [18][19][20][21]. However, properties of TiAl alloy castings are deteriorated by the reaction between common refractory and melts of TiAl alloys with high activity.…”

Effect of Ta on the Solidification Behavior of Ni₃Al-Base Single-Crystal Superalloys

“…Table 3 shows the solidification parameters of the two alloys [22][23][24] ：T L ---the liquidus temperature, T 1 ---the interdendritic pathway blocked temperature, Ts---the solidus temperature(the liquid fraction less than 1%), △T=T L -Ts, △T 1 =T L -T 1 , △T 2 =T 1 -Ts, F---the liquid volume fraction at the temperature when the interdendritic pathway was blocked. The data makes clear [22][23][24][25] , the smaller of the value of △T, F, △T2, the better of the casting performance of the alloys. From table 3 we can see the three value of IC31A are relatively small, thus the casting performance of IC31A is good.…”