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  New insights into high-temperature deformation and phase transformation mechanisms of lamellar structures in high Nb-containing TiAl alloys

Song, L., Appel, F., Wang, L., Oehring, M., Hu, X., Stark, A., et al. (2020). New insights into high-temperature deformation and phase transformation mechanisms of lamellar structures in high Nb-containing TiAl alloys. Acta Materialia, 186, 575-586. doi:10.1016/j.actamat.2020.01.021.

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 Creators:
Song, Lin1, 2, Author              
Appel, Fritz1, Author
Wang, Li1, 3, Author
Oehring, Michael1, Author
Hu, Xingguo2, Author
Stark, Andreas4, Author              
He, Junyang5, Author              
Lorenz, Uwe1, Author
Zhang, Tiebang2, Author
Lin, Junping6, Author
Pyczak, Florian7, Author              
Affiliations:
1Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max Planck-Str. 1, Geesthacht 21502, Germany, ou_persistent22              
2State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China, ou_persistent22              
3State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China, ou_persistent22              
4Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany, ou_persistent22              
5Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
6State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China, ou_persistent22              
7Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, Geesthacht, Germany, ou_persistent22              

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Free keywords: Aluminum alloys; Binary alloys; Deformation; High resolution transmission electron microscopy; Lamellar structures; Morphology; Niobium alloys; Phase transitions; Transmission electron microscopy; Twinning, Deformation twinning; High nb containing tial alloys; High temperature deformation; High-temperature compression; Micro-structure evolutions; Orientation relationship; Phase transformation mechanisms; Titanium aluminides, Titanium alloys
 Abstract: The paper describes the microstructure evolution by high-temperature compression of a high Nb-containing TiAl alloy. The paper extends a previous publication [Song, et al. Intermetallics 109 (2019) 91–96], in which a unique twin-like morphology in the α2 (Ti3Al) phase was reported. However, the origin of these structures could not be clarified without doubt. The present study is focused on phase transformations that in this multiphase alloy can be associated with deformation. Particular attention is paid to local transformations of the α2 phase into O phase or ω-related phases, which, because of structural and chemical similarity of these phases with α2, can easily occur and could mistakenly be considered as a twin structure. The details of the atomic processes involved are elucidated by electron microscopy. Given the large shufflings and the atomic site interchanges required for the operation of this twinning system, it is concluded that twinning of the α2 phase is a diffusive-displacive process. Within the α2 phase, ωo is heterogeneously nucleated. The nucleation sites are defect-rich areas, which are subjected to high local stresses. The study strongly emphasizes the close relationship between high-temperature deformation and phase transformations in multiphase titanium aluminide alloys. © 2020 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2020-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.actamat.2020.01.021
 Degree: -

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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 186 Sequence Number: - Start / End Page: 575 - 586 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100