|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Mechanical Behavior at the Nanoscale IV
||Stress-strain Responses from Spherical Nanoindentation and Micro-pillar Compression Experiments in Fe-3% Si: A Comparative Study
||Soumya Varma, Jordan S Weaver, Johann Michler, Surya Kalidindi, Siddhartha Pathak
|On-Site Speaker (Planned)
Spherical nanoindentation and micro-pillar compression experiments were conducted on large (millimeter sized) individual grains of different orientations in two sets of Fe-3%Si (BCC) polycrystalline samples (as-cast, 30% deformed). The indentation loading moduli, yield strength, and post-yield strain hardening behavior were obtained by transforming raw indentation load-displacement data into stress-strain curves. Micro-pillars of varying diameters were FIB machined on the same grains, then in-situ SEM compression tested to identify yield strength and strain hardening behavior. Local crystal lattice orientations were measured by electron backscatter diffraction. Slip resistances calculated from indentation (155.4 ± 3.5 MPa) and pillars (201 ± 28 MPa) are in good agreement. From these results, we estimate the percentage increase (16% during indentation) in slip resistance of the deformed polycrystalline cubic metals from their fully annealed condition. Advantages and limitations of each technique to capture plastic anisotropy and changes in slip resistance are discussed.
||Planned: Supplemental Proceedings volume