Strain hardening behaviour of an initially textured TI6AL4V titanium alloy as a function of strain rate and compression direction

Frederik Coghe, Luc Rabet, Paul Van Houtte

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Résumé

This work shows some first results of a study aiming to determine the deformation mechanisms of a commercially available titanium alloy Ti6A14V as a function of initial texture and strain rate. In particular this work will deal with the strain hardening behaviour of the material. Cylindrical specimens were fabricated from a textured extruded bar in mill annealed condition. One set of cylindrical samples (LD) had its axis aligned to the axis of the rod, a second set (TD) had its axis perpendicular to the rod axis and parallel to the majority of the caxes of the α-phase. Both sets were tested under uni-axial compression loading for a wide range of strain rates (0.001/s up to 1000/s) using a servo-hydraulical testing machine (lower strain rates) and a SHPB-setup (higher strain rates). The LD-samples showed lower flow stresses than the TD-samples for the same amount of strain, as could be expected from the lower CRSS available slip systems. The LD-samples also supported much more strain before final fracture. The strain hardening of the LD-samples showed a clear tendency to increase significantly during deformation, this tendency being less pronounced for the TD-samples. This was clearly illustrated by the concave-up true stress - true strain curves. Friction effects could be ruled out as being the source of this behaviour and after the origin of this hardening behaviour could be attributed to extensive twinning as illustrated by optical microscopy, but to be confirmed by TEM analysis. Texture measurements (OIM and XRD) before and after testing showed for both sets rotating of the c-axes of the α-phase towards the compression axis.

langue originaleAnglais
titreMaterials Processing and Texture - A Collection of Papers Presented at the 15th International Conference on Textures of Materials, ICOTOM 15
Pages491-499
Nombre de pages9
étatPublié - 2008
EvénementMaterials Processing and Texture - 15th International Conference on Textures of Materials, ICOTOM 15 - Pittsburgh, PA, États-Unis
Durée: 1 juin 20086 juin 2008

Série de publications

NomCeramic Transactions
Volume200
ISSN (imprimé)1042-1122

Une conférence

Une conférenceMaterials Processing and Texture - 15th International Conference on Textures of Materials, ICOTOM 15
Pays/TerritoireÉtats-Unis
La villePittsburgh, PA
période1/06/086/06/08

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