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A New Variant Selection Criterion for Twin Variants in Titanium Alloys (Part 1)


  • This work was supported by the Federation of Research for Aeronautic and Space (Fédération de Recherche pour l'Aéronautique et l'Espace Thème Matériaux pour l'Aéronautique et l'Espace: project OPTIMIST (optimisation de la mise en forme d'alliage de titane)).


A new selection criterion to explain the activation of the twinning variant is proposed based on the calculation of the deformation energy to create a primary twin. The calculation takes into account the effect of the grain size using a Hall-Petch type relation. This criterion allows to obtain a very good prediction for the variant selection. The calculations are compared with the experimental results obtained on T40 deformed by Channel Die compression.