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  Deformation mechanisms in micron-sized PST TiAl compression samples: Experiment and model

Rester, M., Fischer, F. D., Kirchlechner, C., Schmoelzer, T., Clemens, H. J., & Dehm, G. (2011). Deformation mechanisms in micron-sized PST TiAl compression samples: Experiment and model. Acta Materialia, 59(9), 3410-3421. doi:10.1016/j.actamat.2011.02.016.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-20E4-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-001A-20EE-5
Genre: Journal Article
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 Creators:
Rester, M.1, Author              
Fischer, F. D.2, Author              
Kirchlechner, C.3, Author              
Schmoelzer, T.4, Author              
Clemens, H. J.4, Author              
Dehm, G.1, 3, Author              
Affiliations:
1Department of Materials Physics, Montanuniversität Leoben, Leoben, Austria, ou_persistent22              
2Institute of Mechanics, Montanuniversität Leoben, A-8700 Leoben, Austria, ou_persistent22              
3Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Leoben, Austria, ou_persistent22              
4Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef Strasse 18, 8700 Leoben, Austria, ou_persistent22              

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 Abstract: Titanium aluminides are the most promising intermetallics for use in aerospace and automotive applications. Consequently, it is of fundamental interest to explore the deformation mechanisms occurring in this class of materials. One model material which is extensively used for such studies are polysynthetically twinned (PST) TiAl crystals, which consist predominantly of parallel γ-TiAl and, fewer, α2-Ti3Al lamellae. In the present study, PST TiAl crystals with a nominal composition of Ti–50 at.% Al were machined by means of the focused ion beam (FIB) technique into miniaturized compression samples with a square cross-section of approximately 9 µm x 9 µm. Compression tests on the miniaturized samples were performed in situ inside a scanning electron microscope using a microindenter equipped with a diamond flat punch. After deformation, thin foils were cut from the micro-compression samples and thinned to electron transparency using a FIB machine in order to study the deformation structure by transmission electron microscopy (TEM). The TEM studies reveal mechanical twinning as the main deformation mechanism at strains of 5.4%, while at strains of 8.3% dislocation glide becomes increasingly important. The experimentally observed twins scale in size with the width of the γ-TiAl lamella. A kinematic and thermodynamic model is developed to describe the twin-related length change of the micro-compression sample at small strains as well as the relationship of an increase of twin width with increasing γ-TiAl lamella thickness. The developed twin model predicts a width of the twins in the range of a few nanometers, which is in agreement with experimental findings.

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Language(s): eng - English
 Dates: 2011-05-09
 Publication Status: Published in print
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 Identifiers: DOI: 10.1016/j.actamat.2011.02.016
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Title: Acta Materialia
Source Genre: Journal
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Publ. Info: Tarrytown, NY : Pergamon
Pages: - Volume / Issue: 59 (9) Sequence Number: - Start / End Page: 3410 - 3421 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100