Nanoindentation-induced deformation twinning in MAX phase Ti$_2$AlN
Christophe Tromas, Salom\'e Parent, Wilgens Sylvain, Ludovic Thilly,, Gilles Renou, Christopher Zehnder, Sebastian Schr\"oders, Sandra, Korte-Kerzel, Anne Joulain
TL;DR
This study reveals the formation of deformation twins in Ti2AlN MAX phase induced by nanoindentation, combining TEM and ACOM techniques to identify complex twinning structures and mechanisms.
Contribution
First identification of {11-22} and {11-21} deformation twins in a MAX phase using combined TEM and ACOM analysis.
Findings
Deformation twins {11-22} and {11-21} are observed in Ti2AlN.
Complex twinning structures involving secondary twinning are characterized.
Nanoindentation effectively induces and reveals deformation mechanisms in MAX phases.
Abstract
Plastic deformation mechanisms have been investigated in the MAX phase Ti2AlN. Nanoindentation has been used to induce plastic deformation in a single grain, and a Transmission Electron Microscopy (TEM) lamella has been extracted in cross section through the indent by using Focused Ion Beam (FIB) technique. By combining TEM observations and automated crystal orientation mapping (ACOM), highly misoriented domains (HMD) have been revealed below a nanoindentation imprint. Thanks to a careful analysis of the relative crystal orientations between these HMD, {11-22} and {11-21} deformation twins have been identified for the first time in a MAX phase. Complex structures, involving secondary twinning or different {11-22} twin variants have also been characterized.
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