High temperature deformation behaviors of a high Nb containing TiAl alloy

Effect of hot-deformation on the microstructure of the Ti–Al–Nb–W–B alloy

“…The strength at room and elevated temperatures is sensitive to the interlamellar spacing, exhibiting an increased strength with decreasing the interlamellar spacing [9,22]. For TiAl-based alloys, the fullylamellar (FL) structure, composed of a 2 /g lamellae, exhibits higher fracture strength; while the duplex (DP) structure, composed of the lamellar colony and primary g phase, tends to have good room-temperature tensile ductility [9,22] The as-cast large ingot specimen after the HIPping and homogenization treatment, with an average grain size of 110 mm, composed of a near-fully lamellar structure and a large amount of residual b phase, exhibits low yield strength and a near zero roomtemperature tensile ductility. After the hot-forging process, a duplex structure with a fine grain size of w60 mm can be obtained.…”

Evolution of grain boundary and texture in as-forged Ti–45Al–9Nb–Y alloy during tensile test at different temperature

“…Plastic deformation and dynamic recrystallization are the two main actions of TiAl based alloy during tensile test at high temperature [21]. Dynamic recrystallization takes place in Tie46Ale2V alloy at 950 C with a strain rate lower than 0.1 s À1 [22]. Then plastic deformation and dynamic recrystallization may occur simultaneously at 900 C tensile test.…”

A closely-complete peritectic transformation during directional solidification of a Ti-45Al-8.5Nb alloy

“…Niobium-rich g-TiAl-based alloys are potential candidates for high-temperature structural applications because of their excellent mechanical behaviour and good oxidation resistance at elevated temperatures [1,2]. However, their applications are mainly hindered by the poor ductility and toughness at room temperature (RT) [3].…”