Preprint Article Version 2 This version is not peer-reviewed

A Dislocation-scale Characterization of the Evolution of Deformation Microstructures around Nanoindentation Imprints in a TiAl Alloy

Version 1 : Received: 19 January 2018 / Approved: 19 January 2018 / Online: 19 January 2018 (10:21:11 CET)
Version 2 : Received: 12 February 2018 / Approved: 12 February 2018 / Online: 12 February 2018 (17:07:45 CET)

A peer-reviewed article of this Preprint also exists.

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. 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.

Journal reference: Materials 2018, 11, 305
DOI: 10.3390/ma11020305

Abstract

In this work, plastic deformation was locally introduced at room temperature by nanoindentation on a γ-TiAl based alloy. Comprehensive analyzes 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.

Subject Areas

TiAl alloys; dislocation; twinning; nanoindentation; ECCI

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