Recently established spherical indentation stress-strain protocols have demonstrated the feasibility of measuring reliably the mechanical responses at different material structure length scales in a broad range of structural alloys. In the present study, we apply these high-throughput protocols on the primary a-phase grains in polycrystalline samples of Ti5-2.5, Ti811, Ti64, Ti6242 and Ti624 to aggregate a large experimental dataset that documents systematically the effects of a-phase chemical composition and grain orientation on the measured values of indentation modulus and the indentation yield strength. This dataset is being offered to the materials community in an open repository to allow further analyses of the effect of chemical composition of the a-phase on its single crystal elastic-plastic properties. This study clearly establishes the feasibility and tremendous value of spherical indentation stress-strain protocols for documenting the grain-scale anisotropic mechanical responses of different a-phase compositions in high-throughput assays. In part II of this paper, the dataset is analyzed with advanced statistical approaches to estimate the single crystal elastic stiffness constants and the critical resolved shear strengths (CRSS) of the different Ti alloys studied.
Surya R. Kalidindi
Air Force Research Laboratory
Georgia Institute of Technology
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