Research Training Group 2154 - Materials for Brain

RTG Colloquium talk by Assistant Prof. Ashley Buscek: Observing Microstructure Evolution in Shape Memory Alloys Using In Situ Synchrotron X-Ray Techniques

Nov 17, 2017 from 03:15 PM to 04:15 PM

TF, Aquarium

In the case of shape memory alloys (SMAs), fundamental micromechanical theory has been an active area of research for more than 70 years. However, experiments to validate these theories on the microstructural scale are relatively new, challenging, and often limited to twodimensional surface measurements. As a result, there persists a general lack of understanding regarding the relationships that link microstructure evolution to macroscopic behavior. To address this open area, we utilize cutting-edge in situ synchrotron X-ray techniques such as near-field and far-field 3D X-Ray Diffraction (3DXRD) and Dark-Field X-Ray Microscopy (DFXM). Using these techniques, I present results from two particular experiments on nickeltitanium: (1) The micromechanics behind localized deformation bands in martensite reorientation are revealed using 3DXRD, elucidating the relationship between microstructure evolution and macroscopic material response; (2) The topology, misorientation, and elastic strains inside an austenite single crystal during thermally-induced transformation are shown using DFXM with a spatial resolution of 100 nm, orientation resolution of 0.1 mrad, and strain resolution of 10-4.

 

Biography: Ashley Bucsek is a Mechanical Engineering PhD student at Colorado School of Mines and a visiting scientist on beamline ID06 at the European Synchrotron Radiation Facility. In early 2018, she will begin a postdoctoral position with Richard James in the Department of Aerospace Engineering and Mechanics at the University of Minnesota. She is the Student Board Member on the Board of ASM’s International Organization on Shape Memory and Superelastic Technologies. Her research is focused on the micromechanical theory and in situ, multiscale characterizations of ferroic and multiferroic materials. She is the recipient of an NSF Graduate Research Fellowship and an NSF GROW award.

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