Recovery, recrystallization and phase transformations during thermomechanical processing and treatment of TiAl-based alloys

Zhang, W.-J; Lorenz, U.; Appel, F.

doi:10.1016/s1359-6454(00)00093-8

Cited by 113 publications

(57 citation statements)

References 11 publications

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“…(ii) Due to non-thermal equilibrium and metastability of the microstructure, phase boundary bulging takes place in Ti-45Al-10Nb [5]. (iii) Due to the low stacking fault energy of titanium aluminides, nucleation and growth takes place in highly deformed regions of Ti-47Al-2Mn-2Nb + 0.8 vol.% TiB 2 [4].…”

Section: Resultsmentioning

confidence: 99%

“…Small amounts of different alloying elements (Cr, Nb, Mn, V, Si, B, C) improve the room temperature ductility, formability, tensile strength, creep and oxidation resistance [1]. Most of the previous works on hotworking of TiAl-based alloys have focused on the processing related aspects, however, only a few studies are available on details of the recovery and dynamic recrystallization (DRX) processes [2][3][4][5][6][7][8]. Therefore, it is the aim of the present work to investigate the microstructure evolution and creep behaviour during large strain torsion of Ti-45Al-4(Cr, Nb, Ta, B).…”

Section: Introductionmentioning

confidence: 99%

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High strain torsion of a TiAl-based alloy

Cao

Klöden

Rybacki

et al. 2008

Materials Science and Engineering: A

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A two-phase lamellar and globular TiAl-based alloy Nb, Ta, B)) with different textures has been deformed in torsion in a Paterson-type rock deformation machine at a temperature of 1173 K under 400 MPa argon confining pressure. The shear stress -shear strain curves with increasing shear strain show a decrease or increase of shear stress in the lamellar and globular case, respectively, to a common steady state value. Activation analysis at high strains yields stress exponents of about 1.8 and an activation energy of 3.29 eV. With increasing shear strain the lamellar structure breaks down and a two-phase fine-grained globular structure develops by recrystallization with a grain size in the order of 2 microns. The weak initial fibre textures at high strains are randomized. The mechanical, microstructural and textural features indicate a transition from dislocation creep to superplastic flow.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High strain torsion of a TiAl-based alloy

Cao

Klöden

Rybacki

et al. 2008

Materials Science and Engineering: A

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“…This probably leads to a sluggish recrystallization kinetics. Of perhaps greater significance for texture development is that the new grains grow by bulging; details of this mechanism were investigated in an earlier study on a Ti -45Al -10Nb (at%) alloy [38]. The characteristic feature of grain boundary bulging is that the new grains have a similar orientation to the old grains from which they have grown.…”

Section: Effects Of Recrystallization and Phase Transformationsmentioning

confidence: 99%

Physical aspects of hot-working gamma-based titanium aluminides

et al. 2004

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“…pct) alloy. [62] The characteristic feature of grain-boundary bulging is that the new grains have a similar orientation to the old grains from which they have grown. Thus, the operation of the mechanism is expected to result in a recrystallization texture that is closely related to the deformation texture.…”

Section: B Effects Of Recrystallization and Phase Transformationmentioning

confidence: 99%

Neutron diffraction study of texture development during hot working of different gamma-titanium aluminide alloys

Brokmeier

Oehring

Lorenz

et al. 2004

Metall Mater Trans A

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The evolution of preferred orientations during processing appears to be of significant importance for the use of ␥-titanium aluminide alloys, since the desired lamellar microstructures exhibit a strong anisotropy of mechanical properties. In this work, texture development has been investigated after hot extrusion and sheet rolling, which are considered to be technologically relevant wrought processes. As texture evolution certainly is dependent on several factors, involving deformation properties, recrystallization kinetics, and, particularly, the phase constitution at hot-working temperature, different processing conditions and alloy compositions were investigated. By comparing the results, it is indicated that the determined textures can be understood by the deformation modes of the dominating phase at hot-working temperature and the subsequent phase transformations. However, the current understanding of texture evolution is far from being complete, as no model can be presented which quantitatively accounts for the contribution of the different processes mentioned.

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Recovery, recrystallization and phase transformations during thermomechanical processing and treatment of TiAl-based alloys

Cited by 113 publications

References 11 publications

High strain torsion of a TiAl-based alloy

High strain torsion of a TiAl-based alloy

Physical aspects of hot-working gamma-based titanium aluminides

Neutron diffraction study of texture development during hot working of different gamma-titanium aluminide alloys

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