A Dislocation-Scale Characterization of the Evolution of Deformation Microstructures around Nanoindentation Imprints in a TiAl Alloy
by
Antoine Guitton 1,2,*
, Hana Kriaa 1,2, Emmanuel Bouzy 1,2, Julien Guyon 1,2 and Nabila Maloufi 1,2
Antoine Guitton 1,2,*, Hana Kriaa 1,2, Emmanuel Bouzy 1,2, Julien Guyon 1,2 and Nabila Maloufi 1,2
1
Université de Lorraine, CNRS, Arts et Métiers ParisTech, LEM3, F-57000 Metz, France
2
Laboratory of Excellence on Design of Alloy Metals for low-mAss Structures (DAMAS)—Université de Lorraine, 57073 Metz, France
*
Author to whom correspondence should be addressed.
Materials 2018, 11(2), 305; https://doi.org/10.3390/ma11020305
Received: 19 January 2018 / Revised: 7 February 2018 / Accepted: 12 February 2018 / Published: 20 February 2018
(This article belongs to the Special Issue Design of Alloy Metals for Low-Mass Structures)
In this work, plastic deformation was locally introduced at room temperature by nanoindentation on a γ-TiAl-based alloy. Comprehensive analyses of microstructures were performed before and after deformation. In particular, the Burgers vectors, the line directions, and the mechanical twinning systems were studied via accurate electron channeling contrast imaging. Accommodation of the deformation are reported and a scenario is proposed. All features help to explain the poor ductility of the TiAl-based alloys at room temperature.
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Keywords:
TiAl alloys; dislocation; twinning; nanoindentation; ECCI
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MDPI and ACS Style
Guitton, A.; Kriaa, H.; Bouzy, E.; Guyon, J.; Maloufi, N. A Dislocation-Scale Characterization of the Evolution of Deformation Microstructures around Nanoindentation Imprints in a TiAl Alloy. Materials 2018, 11, 305.
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