- This event has passed.
MSE Seminar: “Advanced Microscopy Techniques for Understanding Dislocation Interactions & Damage in Complex Microstructures”
November 17, 2022 at 10:30 AM - 11:30 PM
Microstructurally and compositionally complex alloys (MCCA) such as Nickel-Aluminum-Bronze (NAB) are important to Navy and maritime applications due to their high strength, toughness, and fatigue resistance, as well as excellent corrosion resistance. NAB’s are widely used in many naval applications including ship propellers, underwater fasteners, pumps, and valves. Traditional sand cast NAB alloys tend to have a large amount of waste material, and reduced complexity in component geometry due to the limitations of the casting processing. As a result, NAB alloys are emerging as a viable alloy for additive manufacturing (AM) and therefore provides a new space to establish fundamental relationships between AM processing, structure and properties. Of the additive processes, wire arc additive manufacturing (WAAM) is an evolving technology for fabricating large-scale, near net shape NAB components. It is understood that the high cooling rates achieved in WAAM prevent the precipitation of coarse rosette-like kI phase which usually form during the latter stages of solidification during the casting process. In this work, the dislocation interactions with interfaces such as grain boundaries and precipitates will be used to understand fatigue life and crack initiation and growth behavior in these alloys during low-cycle and high-cycle fatigue.
Aeriel D.M. Leonard
Assistant Professor in the Materials Science and Engineering Department at The Ohio State University
Dr. Aeriel D.M. Leonard is an Assistant Professor in the Materials Science and Engineering Department at The Ohio State University. She was awarded the Department of Energy Early Career Award in 2022 and the Office of Naval Research Young Investigator Award in 2021. She earned her Bachelor’s Degree in Metallurgical and Materials Engineering from the University of Alabama in 2012. In 2013, she began her PhD journey at the University of Michigan in Materials Science and Engineering where she earned her PhD in 2018. Dr. Leonard’s PhD work investigated real-time microstructural and deformation evolution in magnesium alloys using advanced characterization techniques such high energy diffraction microscopy and electron back scatter diffraction. During her time at Michigan she led and worked on many teams aimed at increasing the number of underrepresented minorities in engineering including developing and implementing a leadership camp for female engineering students in Monrovia, Liberia. Dr. Leonard was awarded an NRC Postdoctoral Fellowship at the US Naval Research Laboratory in Washington DC where she worked for two years. During this time, she used advanced characterization techniques such as x-ray computed tomography and high energy diffraction microscopy to understand damage and texture evolution during in-situ loading in additive manufactured materials. She also runs a lifestyle blog titled AerielViews aimed at young graduate and professional students.