The Influence of Alloying and Processing on the Microstructure and Properties of B-NiAl; Annual Technical Report for AFOSR Grant No. F49620-93-1-0309 Submitted to Department of the Air Force Directorate of Chemistry and Materials Science Air Force Office of Scientific Research Attention: Dr. Charles H. Ward Program Manager

i, 108 pages (printed single-sided only). Figures. Tables. This work had three main thrust areas: Solidification Studies and Single Crystal Growth; Mechanical Behavior of NiAl Single Crystals, and Other Characterization Studies. During the second year of this program, the efforts shifted from specimen preparation and characterization to property measurements and interpretation. Specifically, the authors continued to refine the processing strategies with the goal of producing high quality materials with controlled compositions and impurity levels and to then correlate the properties measured with the impurity and solute levels present. Among the accomplishment was the demonstrated ability to produce single crystals of NiAl with minimal contamination. They also had observations that suggested that NiAl superheats above its melting temperature and felt this merited further consideration. A major focus of this work was the area of mechanical property measurements. Significantly, the authors have shown that both static and dynamic strain aging (SSA and DSA, respectively) occur in NiAl, as originally hypothesized in their initial proposal. This was part of the University Research Initiative of the Air Force Office of Scientific Research. Dr. Michael Kaufman is currently the Director of Materials and Energy Initiatives at the Colorado School of Mines. Prior to taking this position, he served in various capacities at Mines starting in 2007. He became the Dean of Energy and Materials Programs and Vice Provost for Graduate and Research Initiatives where he served from 2018-2021. In 2021, he joined the Office of Research and Technology Transfer in his current role. Prior to his time at Mines, Dr. Kaufman served on the faculty at the University of North Texas, the University of Florida, and the University of Washington and as a staff member at the National Institute of Science and Technology. His research focus has been in using advanced characterization techniques to study materials with a focus on alloys for structural applications. Reza Abbaschian is an Iranian/American engineer, currently the William R. Johnson, Jr. Family Professor, Distinguished Professor of Mechanical Engineering and the former Dean of the Bourns College of Engineering and, also formerly the Vladimir Grodsky Professor of Materials Science at University of Florida. The Air Force Office of Scientific Research (AFOSR) provides basic research funding to further progress towards Air Force mission needs. AFOSR has a staff of 200 scientists, engineers and administrators headquartered in Arlington, Va., and has foreign technology offices in Santiago, London and Tokyo. The focus of AFOSR is on research areas that offer significant and comprehensive benefits to national warfighting and peacekeeping capabilities, organized by five scientific departments: Dynamical Systems and Control Division; Quantum and Non-Equilibrium Processes Division; Information, Decision and Complex Networks Division; Complex Materials and Devices Division; and Energy, Power and Propulsion Division. AFOSR has formed a strong, productive alliance with other government agencies, industry and the academic community. About 70 percent of the research is conducted in academia and industry and the remaining 30 percent is conducted within AFRL.…