Microstructural Evolution and Dynamic Recrystallization Behavior of β–γ TiAl‐based Alloy during Hot Compression

Abstract

In this paper, the hot deformation behavior of a TNM TiAl-based alloy (Ti-44.45Al-3.80Nb-1.01Mo-0.29Si-0.14B) is investigated via isothermal compression tests. The experimental results demonstrate that the critical strain for dynamic recrystallization gradually decreases with increasing deformation temperature. At the initial stage of the low-temperature deformation process, the deformation is mainly caused by dislocation glide in the g and b phases. When the deformation reaches a certain level, dislocation glide in the b and the DRX g phases dominates the deformation. In the high-temperature deformation process, the deformation is the result of dislocation glide in the a and b phases.

The improved properties and microstructure of β-solidify TiAl alloys by boron addition and multi steps forging process

“…5(a,d). The DRX behavior of γ phase dominates hot deformation 28,29 while much DRXed α and γ phase would nucleate 17 . The β, α and γ phase represent A2, D0 19 and L1 0 structure at 1180 °C.…”

Boride Formation, Microstructure Evolution, and Mechanical Properties of Ti42Al6Nb2.6C0.8Ta Alloyed by Boron

“…Due to the high specific strength, high oxidation, and creep resistance, high‐Nb TiAl alloys have attracted immense worldwide attention in aero‐engines and automotive engines . The alloys exhibited non‐uniform mechanical properties at room temperature in the as‐cast condition, which was caused by extensive macro segregation . Al is the most influential element affecting the properties of TiAl alloys.…”