|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||Influence of Elastic Anisotropy and Local Texture on the Onset of Plastic Slip in Ti-6Al-4V
||Samuel Hemery, Patrick Villechaise, Loïc Signor
|On-Site Speaker (Planned)
The low cycle fatigue life of titanium alloys highly depends upon the crack initiation stage which is generally controlled by slip activity in the alpha phase. Prior works highlighted a preferential fatigue crack initiation in  oriented regions. In order to characterize the onset of slip activity at the local scale, in-situ SEM tensile testing was applied to polycrystalline specimens. Several regions of interest with different crystallographic textures assessed using the EBSD technique have been studied. Load partitioning is evidenced at the macrozone scale, thus leading to a heterogeneous deformation. A comparison with single colony experiments is presented to highlight the influence of the elastic anisotropy of the alpha phase on stress heterogeneity according to grain neighborhood. Estimation of critical resolved shear stress from data obtained with polycrystalline specimens is finally discussed and a correction procedure is proposed.
||Planned: Supplemental Proceedings volume