|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||F-78: Microstructure Evolution in Martensitic NiTi Using High Energy Diffraction Microscopy
||Ashley Bucsek, Harshad Paranjape, Branden Kappes, Darren Dale, Peter Ko, Margaret Koker, Aaron Stebner
|On-Site Speaker (Planned)
The remarkable properties of shape memory alloys (SMA), including superelasticity and shape memory effect, originate from a martensitic phase transformation and the evolution of the martensite microstructure in response to thermo-mechanical loading. While micromechanical theories for martensitic phase transformations have been developed since the mid-20th century, experiments to validate these theories on the microstructural scale are relatively new, challenging, and often limited to surface measurements. To address this open area, we utilize High-Energy Diffraction Microscopy (HEDM), a non-destructive 3D X-ray diffraction technique, to quantify microstructural evolution in martensitic NiTi. The results include martensite correspondent variant evolution during detwinning/reorientation and estimates of misorientation spread and lattice strain in the variants. These results can be used to inform and validate microstructural models of martensite deformation and potentially develop numerical schemes to estimate elastic properties of monoclinic martensite.
||Planned: Supplemental Proceedings volume