|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Deformation and Transitions at Interfaces
||L-59: Mechanical Characterization of Ti-6Al-4V Titanium Alloy at Multiple Length Scales Using Spherical Indentation Stress-strain Measurements
||Jordan S Weaver, Surya R Kalidindi
|On-Site Speaker (Planned)
||Jordan S Weaver
Recent advances in spherical indentation stress-strain protocols and analyses have demonstrated the capability for measuring reliably the mechanical responses in polycrystalline metals at different length scales (sub-micron to several hundreds of microns). These advances have now made it possible to study systematically the mechanical behavior of a single material system at different length scales. We report on spherical indentation stress-strain measurements with different indenter sizes (microns to millimeters) on Ti-6Al-4V (Ti-64) which capture the mechanical response of single phase alpha-Ti-64, single colony (alpha-beta), few colonies, and many colonies of Ti-64. The results show that the average response (indentation modulus and yield strength) from multiple indentations remains relatively unchanged from single phase alpha to many colonies of Ti-64, while the variance in the response decreases with indenter size. The work-hardening response in indentation tests follows a similar behavior up to indentation zones of many colonies, which shows significantly higher work-hardening rates.