Microstructure and mechanical properties of low and heavy alloyed γ-TiAl + α2-Ti3Al based alloys subjected to different treatments

Effect of Deformation Temperature on the Microstructure Characteristics of α Phase in Ti‐40Al‐8Nb‐0.5B Alloys

“…Researchers have also concentrated on TiAl alloys due to the application of these alloys in low pressure turbine blades and turbochargers . As it is known to all, the addition of high melting elements, such as W, Mo, V, and Nb, can effectively improve the service temperature of TiAl alloys . Therefore, such a kind of TiAl alloys, β‐stabilized γ‐TiAl alloys, has been intensively studied.…”

Response of the solidification microstructure of a high Nb containing TiAl alloy to an isothermal high-temperature heat treatment

“…The influence of solidification segregation on the microstructure of Nb containing TiAl alloys such as Ti-44Al-5Nb-1W-1B, Ti46Al-5Nb-1W-1B and Ti-44Al-8Nb-1B was examined, and the results indicated that severe microstructural inhomogeneity caused by solidification segregation was a serious problem for both ingots and component castings [6,7]. Imayev et al reported that severe microstructure inhomogeneity could result in poor properties of TiAl alloys [8]. Clemens et al claimed that high volume fraction of b-segregation was prone to deteriorate creep properties at service temperature and ductility at room temperature [9].…”

The sintering densification, microstructure and mechanical properties of gamma Ti–48Al–2Cr–2Nb alloy with a small addition of copper

“…Recently, alloying g-TiAl based alloys with b-stabilizing elements has received increased attention because it can effectively improve the room-temperature ductility [20] and hightemperature formability of these alloys [21][22][23][24] (excessive formation of b-Ti is, however, detrimental to the creep resistance [25]). These efforts have resulted in the introduction of Cr [26], Mn [27,29], V [28,29], Ag [30], Fe [31] and Ni [32] into g-TiAl based alloys.…”

“…These efforts have resulted in the introduction of Cr [26], Mn [27,29], V [28,29], Ag [30], Fe [31] and Ni [32] into g-TiAl based alloys. In particular, a TNM alloy having the composition of Ti-(42-45)Al-(3-5)Nb-(0.1-2)Mo-(0.1-0.2)B (in at% throughout) [25] and a beta g-TiAl alloy with the composition of Ti-(42-45)Al-(2-6)Nb-(1-6)(Cr, Mn, Mo,V)-(0.2-0.4)(B,C) [33] have been developed. They both showed noticeably improved high-temperature workability without noticeably scarifying other properties, confirming the promising direction of alloying g-TiAl based alloys with b-stabilizing elements.…”