|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Microscale Studies of Transformation Mechanisms in SMAs
||Michael Kimiecik, J Wayne Jones, Samantha Daly
|On-Site Speaker (Planned)
This talk will discuss an experimental investigation into the relationship between detwinning and damage resulting from phase transformation of the functional material Nickel-Titanium. A custom methodology combining SEM and high-resolution, distortion-corrected digital image correlation was used to examine microscale phase transformation. Methodology development will be briefly discussed, including new patterning techniques for reduced length scales and corrections for the complex distortions inherent in SEM imaging. Using the DIC-calculated displacements, the progression of phase transformation and its relation to underlying crystallography was examined at the grain level in mechanically loaded tensile samples. Experimentally-measured strains were correlated to theoretically-calculated transformation strains to determine habit plane variant / correspondence variant solutions. A number of findings will be discussed, including the finding that sub-grain areas that initially transform with a high CV fraction tend to accumulate more residual strain, and that sub-grain detwinning occurs prior to the end of the macroscopic stress plateau.
||Planned: A print-only volume