Dr. R.S Mishra
University Distinguished Research Professor
Department of Materials Science and Engineering
University of North Texas

Abstract

Friction stir welding emerged as a disruptive metal joining technology that transformed the high strength aluminum alloy aerospace structures. Over the last twenty years, a number of friction stir technologies have emerged to tailor the microstructure and build structures in solid state. A major advancement is friction stir based solid state additive manufacturing and friction stir extrusion. In this overview talk, I will briefly cover the fundamentals of the friction stir process and its attributes that allow for emergence of various technological pathways. I will present a brief survey of various possibilities, that cross over from manufacturing to materials/microstructural tailoring. Some of these have potential to be ‘enabling technology’ for the next generation nuclear reactors. For example, friction stir additive deposition (FSAD) can be an alternative way to build stainless steel reactor vessels. The understanding of FSAD process and development of technology for high temperature has reached a critical level. Similarly, a new variant of friction stir extrusion can produce ODS tubes for cladding! Our work on these friction stir is being coupled with development of metastable high entropy alloys (HEAs) that exhibit deformation induced transformation. These metastable HEAs are irradiation resistant through a self-healing mechanism of reversible transformation. Initial results of Fe-ion irradiation will be presented. The purpose of this talk is to stimulate further discussion and exploration of opportunities in the nuclear energy field.

Biography

Dr. Rajiv Mishra (Ph.D. in Metallurgy from University of Sheffield) is a University Distinguished Professor at University of North Texas. He serves as the Director of the Advanced Materials and Manufacturing Processes Institute (AMMPI) at UNT. He is also the Director of the graduated NSF I/UCRC for Friction Stir Processing and a Fellow of ASM International. He is a past-chair of the Structural Materials Division of TMS and served on the TMS Board of Directors (2013-16). He has authored/co-authored 441 papers in peer-reviewed journals and proceedings and is principal inventor of four U.S. patents. His current Google Scholar h-index is 81 and his papers have been cited more than 34000 times. He has co-authored three books; (1) Friction Stir Welding and Processing, (2) Metallurgy and Design of Alloys with Hierarchical Microstructures, (3) High Entropy Materials: Processing, Properties, and Applications. He has edited or co-edited fifteen TMS conference proceedings. He was an associate editor of Journal of Materials Processing Technology and serves on the editorial board of Materials Science and Engineering A, Science and Technology of Welding and Joining, and Materials Research Letters. He is the founding editor of a short book series on Friction Stir Welding and Processing published by Elsevier and has co-authored seven short books in this series. He is a recipient of TMS-SMD Distinguished Scientist Award in 2020.

Thursday, March 9. 2023
4:00 pm seminar

Hybrid Option  (Speaker is in person)

zoom (link upon request)
or
Room 1202 Burlington Labs