Event
MSE Seminar: Dr. Jason Trelewicz, Stony Brook University
Wednesday, November 20, 2024
3:30 p.m.
Room 2108 Chemical and Nuclear Engineering Building
Sherri Tatum
301-405-5240
statum12@umd.edu
Solute Stabilized and Laser Additively Manufactured Tungsten Alloy Plasma Facing Materials
Jason R. Trelewicz1,2,3
1Department of Materials Science and Engineering, Stony Brook University
2Institute for Advanced Computational Science, Stony Brook University
3Materials Science and Technology Division, Oak Ridge National Laboratory
Abstract: One significant materials challenge for future fusion reactors is the susceptibility of the tungsten plasma facing armor to recrystallization above approximately 1200°C. Additionally, the need for geometrically complex components has driven interest in laser additively manufactured tungsten, which is widely plagued by cracking. In this presentation, two computationally designed plasma facing material (PFM) technologies are introduced for addressing the intrinsic limitations of tungsten – grain boundary stabilized ultrafine grained W-Ti-Cr alloys and laser additively manufactured W-Ti-Fe alloys. In the first alloy system, compositional complexities that stabilize fine-grained microstructures are identified from alloy design maps informed by computational thermodynamics. A new series of ternary ultrafine grained tungsten alloys are synthesized through high energy ball milling and direct current sintering with thermal stability demonstrated at and above common recrystallization temperatures for tungsten. Second, a CALPHAD-based alloy design strategy to fabricate laser additively manufactured (AM) tungsten materials free of process cracking and with improved fracture properties is presented. Microstructures are contrasted with pure AM tungsten and discussed in the context of the selected alloying additions and processing-related defects. Collectively, we show that these materials provide a basis for enhancing plasma facing armor performance relative to pure tungsten in terms of thermal stability and manufacturability.
Bio: Dr. Jason Trelewicz is a Professor in the Department of Materials Science and Chemical Engineering and the Institute for Advanced Computational Science at Stony Brook University with joint appointment in the Materials Science and Technology Division at Oak Ridge National Laboratory. His research explores the science of interface engineered materials for extreme environments using advanced processing and characterization tools coupled with multi-scale modeling and simulation. Professor Trelewicz received his Ph.D. in Materials Science and Engineering from the Massachusetts Institute of Technology in 2008. Prior to joining Stony Brook University, he spent four years as Research Director at MesoScribe Technologies, Inc. Professor Trelewicz is a recipient of the DOE Early Career Award (2017) and NSF Faculty Early Career Award (2016). His work on ceramic composite moderators was selected by the Journal of Nuclear Materials for the 2022 Best Paper Award, and he also co-authored a manuscript selected for the 2022 Journal of Asian Ceramic Societies Best Paper Award. Professor Trelewicz was recognized by Long Island Business News Power 25 in Education as a Top Innovator in Energy Research and Stony Brook University as a 40 Under 40 Honoree. He received the Fusen and Yijen Chen Prize for Innovative Research in 2018 and Young Leader Professional Development Award from the Minerals, Metals, and Materials Society (TMS) in 2015. Professor Trelewicz serves as Chair of the TMS Nuclear Materials Committee, Review Editor for Frontiers in Nuclear Engineering, Board of Review Member and Key Reader for Metallurgical and Materials Transactions A, and Chair of the Tungsten Alloys Working Group for the International Energy Agency Fusion Materials Technology Collaboration Program.
