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

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdragepeer review

Samenvatting

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.

Originele taal-2Engels
TitelMaterials Processing and Texture - A Collection of Papers Presented at the 15th International Conference on Textures of Materials, ICOTOM 15
Pagina's491-499
Aantal pagina's9
StatusGepubliceerd - 2008
EvenementMaterials Processing and Texture - 15th International Conference on Textures of Materials, ICOTOM 15 - Pittsburgh, PA, Verenigde Staten van Amerika
Duur: 1 jun. 20086 jun. 2008

Publicatie series

NaamCeramic Transactions
Volume200
ISSN van geprinte versie1042-1122

Congres

CongresMaterials Processing and Texture - 15th International Conference on Textures of Materials, ICOTOM 15
Land/RegioVerenigde Staten van Amerika
StadPittsburgh, PA
Periode1/06/086/06/08

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