|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced Characterization Techniques for Quantifying and Modeling Deformation Mechanisms
||Mechanics of Phase Transformation in Shape Memory Alloys: A Coupled High-energy X-ray Diffraction and Forward Modeling Approach
||Aaron Stebner, Harshad Paranjape, Ashley Bucsek
|On-Site Speaker (Planned)
High energy diffraction microscopy (HEDM), an X-ray based non-destructive technique, enables the characterization of microstructure (grain centroid, size, orientation) and deformation (lattice strain), which is essential to elucidate the mechanics of phase transformation. We present a novel characterization approach that integrates HEDM-based in-situ microstructural characterization with forward modeling of diffraction patterns from martensite microstructures to quantify the micro mechanics of phase transformations. The forward modeling component enables prediction of martensite microstructures that cannot be practically reconstructed using HEDM. Using this approach, we explore the SMA mechanics in two scenarios. First, we discuss the crystal orientation and boundary effects on the stress-induced martensite microstructures in superelastic NiTi single and oligocrystals. Second, we explore the mechanics of detwinning and reorientation in martensitic NiTi SMAs. This coupled diffraction-modeling approach can be extended to other phase transforming and twinning materials.
||Planned: Supplemental Proceedings volume