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  On the reversibility of the α20 phase transformation in a high Nb containing TiAl alloy during high temperature deformation

Song, L., Appel, F., Stark, A., Lorenz, U., He, J., He, Z., et al. (2021). On the reversibility of the α20 phase transformation in a high Nb containing TiAl alloy during high temperature deformation. Journal of Materials Science & Technology, 93, 96-102. doi:10.1016/j.jmst.2021.02.058.

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 Creators:
Song, Lin1, Author
Appel, Fritz2, Author
Stark, Andreas3, Author           
Lorenz, Uwe2, Author
He, Junyang4, Author           
He, Zhanbing5, Author
Lin, Junpin5, Author
Zhang, Tiebang1, Author
Pyczak, Florian6, Author           
Affiliations:
1State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China, ou_persistent22              
2Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max Planck-Str. 1, Geesthacht 21502, Germany, ou_persistent22              
3Institute of Materials Research, Helmholtz-Zentrum Geesthacht, 21502 Geesthacht, Germany, ou_persistent22              
4Atom Probe Tomography, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863384              
5State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China, ou_persistent22              
6Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, Geesthacht, Germany, ou_persistent22              

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Free keywords: Aluminum alloys; Aluminum metallography; Binary alloys; Deformation; High resolution transmission electron microscopy; Nanocrystalline materials; Niobium alloys; Niobium metallography; Titanium metallography, Atom-probe tomography; Characterization techniques; High nb containing tial alloys; High temperature deformation; Mechanical anisotropy; Reverse Transformation; Reversible transformation; Titanium aluminide alloy, Titanium alloys
 Abstract: The transformations between the phases α2 (Ti3Al) and ωo were investigated in a lamellar multiphase titanium aluminide alloy based on γ (TiAl). The paper complements an earlier investigation performed on the same material in which the importance of deformation-induced twin structures for the α2→ωo transformation was demonstrated. The present study shows that the reverse transformation ωo→α2 can also occur during high-temperature deformation. The transformation is probably triggered by constraint stresses, which exist between the different constituents due to the crystalline mismatch. The combined operation of mechanical twinning of the α2 phase and the reversible transformation fully converts the α2 lamellae into a mixture of α2 and ωo. This conversion greatly reduces the mechanical anisotropy existing in former α2 lamellae. Regarding the technical use of the alloy, the stability of the converted structure with respect to further annealing was also examined. The reported processes occur at the nano-meter and sub nano-meter scale, thus, advanced characterization techniques were applied, such as high-resolution transmission electron microscopy (HRTEM) and atom probe tomography (APT). © 2021

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 Dates: 2021-12-10
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jmst.2021.02.058
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Title: Journal of Materials Science & Technology
  Other : J. Mater. Sci. Technol.
Source Genre: Journal
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Publ. Info: Shenyang, China : Editorial Board of Journal of Materials Science and Technology
Pages: - Volume / Issue: 93 Sequence Number: - Start / End Page: 96 - 102 Identifier: ISSN: 1005-0302
CoNE: https://pure.mpg.de/cone/journals/resource/954925584235