Hot deformation behavior of TiAl alloys prepared by blended elemental powders

High temperature deformation behaviors of Ti-45Al-2Nb-1.5V-1Mo-Y alloy

“…Table 1 provides the comparison of peak stress (s p ) and activation energy (Q) values between present alloy and FL TiAl alloys, all the Q values are calculated by calculated by Eq.(4). As listed, the current TiAl alloy exhibits lower Q value compared with FL Ti-45Al-5Nb-0.3Y alloy [21] and PM Ti-45Al-7Nb-0.4W alloy [17].…”

“…So far, many researches have been done on the hot deformation behaviors and microstructure evolution of fully or nearly fully lamellar TiAl alloys, such as Ti45Al-7Nb-0.4W alloy [17], Ti-47Al-2Cr-0.2Mo alloy [18], and Ti47Al-2Cr-1Nb alloy [19] etc. However, little attention was given to study the isothermal deformation behaviors of Mo, V stabilized b phase containing TiAl alloys as well as the inhomogeneous plastic flow.…”

Deformation behaviour of γ+α2 Ti aluminide processed through reaction synthesis

“…It has been observed that isothermal processing is best for this alloy, which also helps in closing the remnant microporosity present in the PM processed alloy. Selection of temperature, strain rate and accordingly hot working process is very important [26,27]. In the present work, hot deformation is imparted by compression using a hydraulic press, which is found to be safe, where rate of compression (strain rate) needs to be very slow (o0.1/s strain rate).…”

“…It results in maintaining flow stress with strain and longer steady state is seen. Therefore, this is the best situation for deformation of brittle materials like Ti aluminides [26,27].…”

Effect of heat treatment on microstructures and mechanical properties in a full lamellar PM TiAl alloy

“…A potential method of overcoming these problems is to use the powder metallurgy (PM) route. In compared of common ingot metallurgy, PM have advantage in eliminating compositional segregation, realizing the macro net-shape forming, and can effectively solve the TiAl intermetallic shaping of difficulty [11][12][13] . It is one of the main preparations for TiAl alloys.…”