Thermomechanical characterization of β-stabilized Ti–45Al–7Nb–0.4W–0.15B alloy

The hot deformation behavior and processing map of Ti–47.5Al–Cr–V alloy

“…And the deformation was a compatible process of work-hardening and dynamic softening and propagation of crack [29]. In addition, it could be concluded that the flow stress had a negative sensitivity to temperature and positive sensitivity to strain rate, respectively.…”

Dynamic recrystallization behavior of an as-cast TiAl alloy during hot compression

“…Niu [12] found that the DRX of asdeformed Ti-43Al-6Nb-1B alloy preferentially proceeds at lamellar colony boundaries, resulting in hard-orientated lamellar structures and recrystallized γ grains. Liu [13] found that the deformation and the recrystallization occur preferentially in the grain boundary β phases in as-cast Ti-45Al-7Nb-0.4W-0.15B alloy. In our previous work [14], we found that DRX becomes the dominant softening mechanism at low Zener-Hollomon parameter (Z) condition.…”

Hot Deformation Behavior and Microstructural Evolution Characteristics of Ti-44Al-5V-1Cr Alloy Containing (γ + α2 + B2) Phases

“…At deformation conditions of 1050 °C and 0.01 s −1 (Figure 7a), the lamellar orientation was perpendicular to the direction of the compression axis, and dynamic recrystallization occurred initially in the lamellar boundaries and where the γ and B2 grains co-existed. The lamellae, which were surrounded by the mixture of gamma and B2, were easily rotated to the direction perpendicular to the compression axis under the action of pressure [8]. The soft B2 phase can promote lamellar colony boundary sliding and grain rotating effectively to release stress concentration and prevent premature fracture failure.…”

“…During hot deformation, work hardening, dynamic recovery (DRV), dynamic recrystallization (DRX), and phase transformations often occur. Some works are available on the hot deformation behavior and microstructural evolution of β phase containing TiAl, and the compositions therein are Ti-43.5Al-4Nb-1Mo-0.1B [5], Ti-43Al-2Cr-2Mn-0.2Y [6], Ti-43Al-4Nb-1.4W-0.6B-0.2Y [7], and Ti-45Al-7Nb-0.4W-0.15B [8,9]. The lamellar grain sizes of these alloys were all fine because of β-phase solidification and the addition of Band/or Y elements.…”