|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Non-equilibrium Features of Grain Boundaries
||Understanding the Effects of Hydrogen on the Plasticity of Individual Crystals within a Polycrystalline Nickel Aggregate Using High Energy X-ray Diffraction and High Pressure Torsion.
||Timothy Long, Matthew Miller
|On-Site Speaker (Planned)
This worked studied the impact of solute hydrogen on plasticity in commercially pure polycrystalline nickel by using high energy x-ray diffraction (HEXD) to interrogate hydrogen-charged and uncharged samples deformed ex-situ by high pressure torsion (HPT). The HEXD experiments were designed to quantify the plastic response in the bulk material. HPT produced a gradient in plastic strain, allowing a range of strains to be investigated. Remnants of the large, original grains were identified using a new indexing algorithm on the HEXD data. This algorithm included intensity information, producing intensity distribution functions over the fundamental region of orientation space, which described the orientation spread of each crystal. A misorientation metric based on these intensity distributions was introduced and used to quantify the spread in orientation space, and thus plasticity, of the samples. In general, the hydrogen charged samples exhibited smaller orientation spreads for a given applied strain.
||Planned: Supplemental Proceedings volume