|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Algorithm Development in Materials Science and Engineering
||Assessment of Heterogeneous Elastic Strains in Polycrystalline Ti-5Al-2.5Sn and Modeling with Taylor Gradient Enhanced Phenomenological Crystal Plasticity Model
||Chen Zhang, Philip Eisenlohr, Martin Crimp, Carl Boehlert, Ruqing Xu, Thomas Bieler
|On-Site Speaker (Planned)
A new strain refinement algorithm is proposed to extract the deformation gradient from micro-Laue diffraction patterns through conjugate gradient descent optimization. This method was used to determine the residual lattice strain field within a microstructural patch of Ti-5Al-2.5Sn (wt%) deformed by uniaxial tension at ambient temperature and subsequently characterized with micro-Laue diffraction (differential aperture x-ray microscopy, DAXM) at the Advanced Photon Source (APS), Argonne National Laboratory. The extracted residual lattice strain field exhibits more heterogeneity than simulated strains using a customized phenomenological crystal plasticity model, with a local Taylor gradient and grain boundary slip transfer parameter installed to approximate the hardening near grain boundaries. The difference between measured and simulated residual lattice strain field indicates that a physics-based model and an accurate 3D microstructure are essential to capture the micromechanics accurately. Supported by DOE/BES grant DE-FG02-09ER46637; DAXM characterization at APS was supported by DOE contract DE-AC02-06CH11357.
||Planned: Supplemental Proceedings volume