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.
Yang Su’s research focuses on the study of stress, strain and GND density in grain boundary vicinity in deformed FCC polycrystalline metals. Using in-situ cross correlation EBSD (HR-EBSD), one can capture the stress/strain caused by dislocation pile-ups and how local stress/strain tensor and GND density evolve with increasing global strain. By collecting HR-EBSD near a large number of grain boundaries (and twin boundaries), we hope to establish a correlation between the character of grain boundaries (or twin boundaries) and the maximum stress/strain that can be reached near those boundaries.
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.
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.
Nashrah’s research focuses on the analysis of microstructure of ferroelectric and antiferroelectric CMOS compatible gate oxides for the application in memory and logic devices. Due to the polycrystalline nature of these oxides, the electrical performances such as operating voltage, polarization dynamics, charge trapping and endurance of the Ferroelectric Field Effect Transistors (FeFETs) depend on the phase, orientation, grain size etc. of its microstructure. Her research involves the study of the microstructure of these materials involving different microscopy techniques such as STEM, TEM, NBED and XRD for the improvement of the overall performance of FeFETs.
Sarah Lombardo (PhD 2022) – TEL
Katie Koube (PhD 2022) – ICON
Jahnavi Desai (PhD 2022)- KLA
Colin Stiers (MS 2022) – US Army
Yung Suk Jeremy Yoo (PhD 2020) – Intel
Jordan Key (PhD 2020) – Department of Defense
Stefan Debates (2021)
Joseph Stover (2021)
Josephine Deronja (2021)
Devon Phelps (2021)
Lauren Holm (2021)
Christian Schneider (2021)
Frank Yu (2021)
Bishop Wright (2021)
Colin Stiers (2021)
Annie Mullins (2020)
Melissa Hernandez Guzman (2020)
Rishab Jain (2020)
Alex Yang (2020)
Michael Knudson (2020)
Xueqiao Wang (2019)
Sarah Blust (2019)
Cassiopeia “Cassi” Cartwright (2019)
Lovelyn Wirian (2019)
Amy Clark (2018)
Chase Scott (2017)
Victoria Ohmer (2017)