|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Magnetic Domain Structure Studies in Ferromagnetic Alloys
||Isha Kashyap, Marc De Graef
|On-Site Speaker (Planned)
Ferromagnetic shape memory alloys (FSMAs) belong to a class of shape memory alloys that exhibit a high magnetic field induced strain (MFIS) by rearrangement of martensite twin variants upon application of an external magnetic field. The main goal of our research is to obtain an understanding of the magnetic domain structure in Ni-Mn-Ga FSMAs and other ferromagnetic alloys such as Co-based superalloys; in these alloy systems, magnetic domain walls can interact with a multitude of micro-structural defects, such as dislocations, twin boundaries, and anti-phase boundaries, and Lorentz transmission electron microscopy (LTEM) was employed to study these interactions. Phase reconstructions of Fresnel through-focus series images provide maps of the integrated magnetic induction in different regions of the samples, and we will provide several examples of domain wall-defect interactions.
||Planned: A print-only volume