|About this Abstract
|2022 TMS Annual Meeting & Exhibition
|Phase Transformations and Microstructural Evolution
|Microstructural Evolution in Oligocrystalline Fe-Mn-Al-Ni Shape Memory Alloys
|Hande Ozcan, Daniel Salas, Ji Ma, Ren Yang, Yuriy Chumlyakov, Ibrahim Karaman
|On-Site Speaker (Planned)
FeMnAlNi alloys have emerged as one of the most promising SMA candidates for large scale applications due to their cost-efficiency, excellent superelasticity and low temperature dependence of the critical stresses with a large superelasticity window. The superelastic performance of FeMnAlNi is dependent on the size of nano-precipitates, the crystallographic orientation of the grains and the ratio of relative grain size to the dimension of component. The fundamental understanding of the microstructure and the ability to increase the component dimension of the alloys for large scale applications is important in the development of FeMnAlNi alloys. In this study, the fundamental mechanisms behind the abnormal grain growth by thermal cycling was studied. A new crystal reorientation mechanism that results in abrupt crystallographic orientation changes in bulk single crystals is reported for the first time. The findings also open up new possibilities for the development of new large single crystals with tailorable orientations.
|Phase Transformations, Characterization, Other