Microstructure and Texture Formation During Near Conventional Forging of an Intermetallic Ti–45Al–5Nb Alloy

Abstract

Texture formation was studied in an intermetallic Ti‐45at%Al‐5at%Nb alloy after uniaxial compression and near conventional forging. Depending on the deformation conditions the texture of the γ‐TiAl phase is formed by pure deformation components, components related to dynamic recrystallization, or transformation components. This changing corresponds with microstructural observations. The α2‐Ti3Al and the α‐Ti(Al) phase show a similar texture as it is known for Ti and Ti‐base alloys after compressive deformation at elevated temperatures. In contrast to the γ texture, no significant change of the α/α2 texture was observed in the temperature range between 800 °C and just below the α‐transus temperature (Tα = 1295 °C).

Microstructure and Texture Evolution in an Intermetallic β‐Stabilized TiAl Alloy During Forging and Subsequent Isothermal Annealing

“…At a first view this is surprising, because previous studies observed a tilted basal fiber texture, i.e. the c ‐axes are tilted about 20° around the LD, which is a characteristic deformation texture formed after compressive deformation in α phase and other hcp metals . But these studies were related to lower compression rates (≤5 × 10 −2 s −1 ) and different phase compositions (no or very small β contents) when compared to the present study.…”

In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy

“…The deformation texture of the tetragonal γ phase consists of weak <110> and <302> fibers. These are typical compression texture components of γ which have already been described in many previous articles [8,13]. The cubic β phase forms significant <001> and <111> fibers which are typical compression texture components of bcc metals.…”

Hot Deformation Behavior of a Ti-40Al-10V Alloy with Quenching-Tempering Microstructure

“…Secondly, <111> γ aligned to CD is observed, and thereby a single <111> γ fiber is produced. However, for ordinary (α 2 + γ) TiAl alloys, in general, the texture components produced during uniaxial compression include <110] γ and <302] γ , as well as the <100] γ fiber caused by DRX [ 25 , 26 , 27 ]. If analyzed as cubic system, these texture components would be <110> γ and <100> γ instead [ 24 ], which are identical with those in normal FCC materials [ 25 ].…”