Office: Love Building, Rm 282
2021 NSF CAREER Award
2018 Bradley Stoughton Award for Young Teachers (ASM)
2017 DOE Early Career Research Award
2017 Office of Naval Research Young Investigator Award
2017 Class of 1969 Teaching Fellowship
2016 TMS Young Professional Development Award
Shaha’s primary research is to understand the fatigue crack initiation and propagation in additively manufactured (AM) metals and alloys. Fatigue performance dictates the service life of AM parts. Approximately 80% of the reported failure is caused by fatigue crack initiation and growth. Low fatigue crack growth rates can guarantee the reliability of parts and extend the service life of the structural components. In his work, the detrimental effect of internal defects on the quasi-static and cyclic loading (i.e. fatigue failure) is investigated using in-situ TEM and EBSD, which is correlated with dislocation-based fatigue models for predicting fatigue life.
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.
Sandra’s research aims to understand the deformation mechanisms of ultrafine grained (UFG) metal thin films under mechanical loading. This is done by in situ TEM straining using a MEMS device for quantitative measurement of stress and strain. Classical deformation behavior, as seen in coarse-grained materials, is not expected in UFG metals because dislocation motion is restricted by the grain boundaries. Thus, it is important to characterize deformation mechanisms as a function of grain size distribution, texturing, and metal type. Nanobeam diffraction is used to determine the critical stress needed for dislocation nucleation and motion.
Sarah’s research involves the structural analysis of ferroelectric and antiferroelectric thin film gate oxides for logic and memory technologies. These materials are characterized by phase transformations upon the application of an external electric field. Sarah performs in-situ TEM biasing to identify and confirm the phases involved in those transformations. Additional characterization techniques (STEM, NBED, PED, XRD) are also employed to determine grain characteristics such as size distribution, orientation, and phase as they relate to the processing and performance of these films.
Taylor’s research focuses on investigating high strain rates on the dislocation and fracture of additively manufactured steels, specifically 316L stainless steel, which is important in many applications that experience high strain rates. This study involves the application of many characterization techniques such as TEM, SEM, and EBSD to study the role of dislocations and twin boundaries in this class of fractures.
Yung Suk Jeremy Yoo – Intel
Jordan Key – Department of Defense
Jahnavi Desai – KLA
Bishop Wright (2021)
Collin Stiers (2021)
Annie Mullins (2020)
Melissa Hernandez Guzman (2020)
Xueqiao Wang (2019)
Sarah Blust (2019)
Cassiopeia “Cassi” Cartwright (2019)
Lovelyn Wirian (2019)
Amy Clark (2018)
Chase Scott (2017)
Victoria Ohmer (2017)
Rishab Jain (2020)
Alex Yang (2020)
Michael Knudson (2020)