High Entropy Alloys Roundtable

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Although it has already been shown that high entropy alloys (HEAs) exhibit very promising combinations of properties, this field continues to offer new findings, holds exciting possibilities for new applications, and still presents many unanswered fundamental questions. This webinar will highlight key issues and opportunities associated with the fundamental science, alloy development, characterization methods, properties, and potential applications of HEAs. A panel of experts will discuss these issues and be available during the live session to answer questions from the webinar attendees.

Alcoa Distinguished Professor of Materials, University of California Santa Barbara

Bio
Tresa Pollock’s research focuses on the mechanical and environmental performance of materials in extreme environments, unique high temperature materials processing paths, ultrafast laser-material interactions, alloy design and 3-D materials characterization. Pollock graduated with a B.S. from Purdue University in 1984, and a Ph.D. from MIT in 1989. She was employed at General Electric Aircraft Engines from 1989 to 1991, where she conducted research and development on high temperature alloys for aircraft turbine engines and co-developed the single crystal alloy René N6 (now in service). Pollock was a professor in the Department of Materials Science and Engineering at Carnegie Mellon University from 1991 to 1999 and the University of Michigan from 2000-2010. Her recent research has focused on development of new femtosecond laser-aided 3-D tomography techniques, damage detection and modeling by resonant ultrasound spectroscopy, thermal barrier coatings systems, new intermetallic-containing cobalt-base materials, nickel base alloys for turbine engines, lightweight magnesium alloys, Heusler-based thermoelectrics and bulk nanolaminates. Pollock was elected to the U.S. National Academy of Engineering in 2005, the German Academy of Sciences Leopoldina in 2015, and is a DOD Vannevar Bush Fellow and Fellow of TMS and ASM International. She serves as editor in chief of the Metallurgical and Materials Transactions family of journals and was the 2005-2006 president of The Minerals, Metals and Materials Society.

Senior Scientist, Materials and Manufacturing Directorate, Air Force Research Laboratory
"High-Entropy and Complex, Concentrated Alloys: A Current Snapshot"

The presenter will briefly describe major findings that characterize HEAs and CCAs as a distinct class of materials. This resumé will include structural and functional properties, strengthening and deformation mechanisms and environmental responses. Emerging topics such as short-range order will be introduced, new research directions will be described, and efforts required to support robust exploration and development of this new class of materials will be presented.

Bio
Daniel Miracle has studied nickel-based superalloys and intermetallic compounds for high temperature aerospace structures; metal matrix composites for structural applications; advanced aluminum alloys for cryogenic components; and boron-modified titanium alloys for improved processibility. His current research includes basic studies and exploration of high-entropy and complex, concentrated alloys as well as fundamental studies of the atomic structure of amorphous metals. He earned his Ph.D. from The Ohio State University and holds an Honorary Doctor of Science from the Institute of Metal Physics, Ukrainian Academy of Sciences. He is a Fellow of ASM, International; a Fellow of The Minerals, Metals & Materials Society (TMS); a Fellow of AFRL; and an Honorary Member of the Indian Institute of Metals. Dr. Miracle has received the AF Basic Research Award and the Presidential Rank Award. He is author or co-author of over 200 peer-reviewed scientific articles and 7 book chapters and is co-editor of 6 books.

Professor of Materials Science & Engineering and Director of the Materials Characterization and Processing Center, Johns Hopkins University, with a joint appointment at Pacific Northwest National Laboratory
"High Entropy Alloys through the Looking ‘Glass’: Characterization as a Pathway to Discovery"

In this talk, an overview of the challenges and opportunities in characterization of high entropy alloys is discussed. Topics range from atomic to mesoscale structural interrogation to platforms for understanding alloy behavior in their target environments using in situ and operando techniques, including high throughput methodologies. Finally, translation of this information toward alloy discovery, classification, and development is reviewed.

Bio
Mitra Taheri is a Professor of Materials Science and Engineering and the Director of the Materials Characterization and Processing (MCP) Center at Johns Hopkins University (JHU). Prior to her position at JHU, Taheri held the Hoeganaes Endowed Chair Professorship in the Department of Materials Science & Engineering at Drexel University. She has received numerous awards, including but not limited to: NSF Career Award, DOE Early Career Award, ONR Summer Faculty Fellowship, Microscopy Innovation Award, R&D 100 Award, US Steel Graduate Fellowship, and MRS Graduate Student Award. Taheri obtained her PhD from Carnegie Mellon University, where she received a US Steel Graduate Scholarship, a Materials Research Society Graduate Student Award, was inducted as a member of Sigma Xi, and was a visiting scholar at RWTH Aachen University, the National Center for Electron Microscopy (LBL), and Northwestern University’s Center for Atom Probe Tomography. Following her doctoral studies, Taheri was an NRC Postdoctoral Fellow at the Naval Research Laboratory (NRL) and a Director’s Postdoctoral Fellow at Lawrence Livermore National Laboratory (LLNL), where her group’s work on the Dynamic TEM project received an R&D 100 award, a Nano-50, and the Microscopy Society of America’s Microscopy Innovation Award. She has received the NSF and DOE Early Career awards, an ONR Summer Faculty Fellowship, and was faculty scholar at the Politecnico di Milano, in Milan, Italy. Taheri has published over 100 articles in journals such as Science, Nature Communications, ACS Nano, Nanoletters, and Acta Materialia, and has garnered over 150 invited and keynote presentations and seminars across the world. She recently served on the editorial board for both the Journal of Materials Research and Nature Scientific Reports.

Taheri leads the Dynamic Characterization Group, focusing on the development and use of innovative in situ microscopy and spectroscopy to characterize microstructural evolution and properties of materials in a wide variety of environments and external stimuli. Her current research focuses on the following topics: instrumentation development for electron microscopy and spectroscopy; machine learning; high throughput methodologies; physical metallurgy and in particular, understanding microstructural evolution; materials processing; metal additive manufacturing (3D printing), magnetic composite development; optimization and in situ processing of quantum materials, 2D materials, and surfaces; and biomaterials, with a particular focus on maternal fetal medicine.

Arthur P. Armington Professor of Engineering II
Director of the Advanced Manufacturing and Mechanical Reliability Center (AMMRC)
Department of Materials Science and Engineering
Case School of Engineering, Case Western Reserve University
"Mechanical Behavior of High-Entropy Alloys"

This talk will briefly cover some of the unique mechanical properties reported for this class of materials. Differences between alloys based on (nominally) single-phase FCC and BCC systems will be highlighted along with new/emerging research directions to extend these efforts to promising application areas.

Bio
John Lewandowski earned a B.S., M.E., and Ph.D. at Carnegie-Mellon University in Metallurgical Engineering and Materials Science, where he was a Hertz Foundation Fellow, followed by a NATO/NSF Postdoctoral Fellowship at Cambridge University. He is also Overseas Fellow at Churchill College, Cambridge University and Visiting Professor at Nanyang Technological University (NTU). Publications and presentations exceed 340 and 1045, respectively, in the areas of processing/structure/property relationships in both crystalline and amorphous advanced materials systems for aerospace, automotive, biomedical, and defense applications. Recent work has focused on additive and other advanced manufacturing techniques. Various national/international awards have been earned for research and teaching/mentoring activities, including the TMS Leadership Award, the 2022 ASM Albert Easton White Distinguished Teacher Award, Fellow of ASM International, and the Institute of Metals Charles Hatchett Award for work on Nb. He has served on numerous panels organized by the NSF and NRC/NAS while also serving on the editorial board of a number of journals.