Office: Love Building, Rm 282
2017 DOE CAREER Award
2017 Office of Naval Research Young Investigator Award
2017 Class of 1969 Teaching Fellowship
2016 TMS Young Professional Development Award
Yung Suk “Jeremy” Yoo
Jeremy studies the dislocation interactions with defects such as grain boundaries, intermetallic particles, and dispersoids in aluminum 6xxx alloys. Fracture initiation of ductile alloys such as aluminum are not yet fully understood, making it difficult to predict and control. Therefore, it is critical to investigate how dislocations interact with various microstructural defects and ultimately lead to crack formation. This project incorporates multiscale in-situ microscopy techniques to characterize dislocation accumulation and strain localization, which can elucidate valuable information lost in post mortem studies. The goal of this study is to identify microstructural features that synergistically facilitate fracture initiation in aluminum.
Jordan uses multiscale characterization techniques to investigate the relationships between microstructure and materials properties in extreme environments. Developments in TEM holders and CCD cameras have made possible powerful in situ TEM characterization in liquid and gaseous environments. Jordan’s current focus is on corrosion problems, linking microstructure to susceptibility and mechanisms so that microstructure sensitive design can be used to create superior corrosion-resistant materials. Such links are developed through the combination of various characterization methods (EBSD, TEM, EDX) with data science methods.
Pragna’s research involves the investigation of fatigue crack initiation process in 316L stainless steel. This class of stainless steel is important as a structural material in the industries. The study involves the application of characterization techniques such as SEM, HR-EBSD and TEM to investigate the role of dislocations, twin boundaries and grain boundaries in fatigue crack initiation.
Jahnavi’s study involves understanding the effect of microstructure on corrosion properties of aluminum metal under sensitized conditions. Advanced localized electrochemical techniques such as Scanning Vibrating Electrode Technique (SVET) along with the characterization techniques such as SEM, EBSD are used to study the corrosion behavior of the metal. The main objective is to assess the important parameters of the microstructure that are responsible for the loss of corrosion resistance. Results from these analyses will be used to determine appropriate microstructure for a corrosion resistant material.
Katie studies the effect of shock and high strain rates on dislocation interactions in additively manufactured metals, with a focus on Stainless Steel 316L. She is interested in the manipulation of microstructure through additive manufacturing to create metals with superior properties compared to traditional processing. Utilization of in-situ TEM to characterize dislocation movement during strain as well as analysis of post-shocked samples can help to characterize the unique response of additively manufactured microstructures to shock environments.
Cassiopeia “Cassi” Cartwright
Cassi’s main interest in research lies in crystallography, particularly in analyzing ceramics and metals for the use of functional materials. Her current work involves the creation and use of X-ray powder diffraction templates to aid in the investigation of ITO phases in the lab. Utilizing principles of crystallography as well as computational programs, she in turn takes the resulting data to build high-resolution templates. The templates are then essentially used as fingerprints in phase identification. Ultimately, it is hoped that these templates may aid in finding deviations in ITO phases observed in an experimental settings as well identifying impurities in the ITO samples themselves.
Xueqiao investigates crack initiation from intrusions and extrusions created by persistent slip bands at grain boundaries in fatigued Aluminum samples. With the embrittlement of Gallium, the Al samples are separated into grains and the grain boundary structures are captured under SEM. Shape of the extrusions at grain boundaries is analyzed in relation to crack nucleation site with possible factors such as grain size, grain orientation, and depth from the surface.
Lovelyn’s research area revolves around the effects of microstructures and acidic corrosion of 302 stainless steels. With the help of EBSD and SEM imaging, the damage caused by the acid media can be characterized, and the relationship between the steel’s grain orientation, grain size and deformation can be assessed.