“Novel Nickel-Based Alloys For High Temperature Structural Applications”
Following a brief description of the MSE department at UNT and its activities, I will present results of our recent work on novel nickel-based alloys for high temperature applications. Molten chloride and fluoride salt fast reactors (MSR) are under active development because they offer several operational and safety advantages over other types of reactors. Modern designs require structural materials with superior corrosion, creep, thermomechanical fatigue, irradiation damage and Helium bubble and tellurium-induced grain boundary embrittlement resistance to high temperatures of 750-950°C. Nickel-base alloys generally perform better than all other alloys studied to date, though none yet have the set of properties to meet these demanding conditions. We will report on the development of the next generation of nickel-base alloys based on the Ni-Mo-W-Cr-X system that combine solid solution strengthening with ordered and other precipitates for superior high temperature properties. An ICME approach is combined with a detailed experimental processing, testing, characterization and modeling program. Results of the alloy design strategy, phase equilibria and transformations and evolution of microstructure and high temperature mechanical properties will be presented. The irradiation and corrosion behavior in molten chloride salt of selected alloys will also be presented. Future directions will be discussed. If time permits, I will also present some results of our work on phase transformations and properties of some additively processed alloys.
Dr. Vijay K. Vasudevan is presently (since Sept 1, 2021) Professor and Chair of the Department of Materials Science and Engineering at the University of North Texas (UNT), Denton, TX. Prior to that he was Herman Schneider Professor of Materials Science and Engineering in the Department of Mechanical and Materials Engineering at the University of Cincinnati (UC), Cincinnati, OH. He received his B.Tech. in Metallurgical Engineering in 1979 from the Indian Institute of Technology, Kharagpur, and his Ph.D. (1986) in Materials Science and Engineering from the University of Tennessee-Knoxville. After a postdoctoral, then Research Assistant Professor stint at the University of Illinois-Urbana-Champaign, he joined UC in 1988 as an Assistant Professor, becoming Professor in 1998. Over the years, his research group has been actively involved in fundamental work on physical metallurgy, phase transformations, microstructural evolution, advanced mechanical surface treatments, mechanical behavior (creep, fatigue), deformation/ fracture, corrosion and stress corrosion cracking mechanisms, structure-property relations and electron microscopy of advanced metallic alloys and intermetallics. Prof. Vasudevan has served as major advisor for >100 undergraduate, 30 M.S. and 19 Phd students and 10 postdoctoral research scholars, edited one book; has 2 patents, published over 197 refereed technical articles; delivered over 319 presentations, including 98 invited talks; and received awards for excellence in teaching, service and research. These include Fellow ASMI, the Fulbright Senior Scholar Award (University of Antwerp-RUCA, Antwerp, Belgium), Japan Society for the Promotion of Science Fellowship at Kyoto and Tohoku University in Japan, the Sigma Xi Young Investigator Award for Scientific Research, Champion H. Mathewson Medal from TMS for the most noteworthy contribution to metallurgical science, Neil Wandmacher Award for Teaching Excellence and Distinguished Researcher Award from the College of Engineering and Fellow of the Graduate School at UC, and several best poster paper awards at national/international conferences. He is a member of ASMI and TMS, has served as past Chairman of the ASMI-TMS Phase Transformations and Structures Committees and currently serves as a member of the Board of Review for Metallurgical and Materials Transactions and as reviewer for many journals and federal agencies. He is also actively involved in student education, curricular and mentoring activities.