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| A talk on Transformation pathways and deformation mechanisms in refractory high entropy alloys

Date Speaker Name

Prof. Hamish Fraser

Date

July 15, 2025

Time

11:00 AM

Location

KCB-222

|SPEAKER BIO
Dr. Fraser graduated from the University of Birmingham (UK) with the degrees of B.Sc. (1970) and Ph.D. (1972). He was appointed to the faculty of the University of Illinois in 1973 (Assistant, Associate and Full Professor), before moving in 1989 to the Ohio State University (OSU) as Ohio Regents Eminent Scholar and Professor. He was appointed as a Senior Research Scientist at the United Technologies Research Center from 1979-1980. He has also been a Senior von Humboldt Researcher at the University of Göttingen, a Senior Visitor at the University of Cambridge, a visiting professor at the University of Liverpool, and he spent a sabbatical leave at the Max-Planck Institut für Werkstoffwissenschaften in Stuttgart. He has been an Honorary Professor of Materials and Technology at the University of Birmingham since 1988. In 2014, he was recognized as an Honorary Professor at the Nelson Mandela University in Port Elizabeth, South Africa. He is an Adjunct Professor at Monash University in Australia and at the University of North Texas. At present, he serves as Director of the Center for the Accelerated Maturation of Materials (CAMM) at OSU. He has been a member of the National Materials Advisory Board and the US Air Force Scientific Advisory Board. He has consulted for a number of national laboratories and several industrial companies. He is a Fellow of TMS, ASM, IOM3 (UK), MSA and MAS. He has been awarded Microanalysis Society President’s Science Award, 2014; the ASM Henry Marion Howe Medal 2019; the TMS-AIME Champion H. Mathewson Award 2020; the Monash Distinguished Engineering Professor Award 2022; the IOM Robert Franklin Mehl Award 2024; and the Henry Clifton Sorby Award 2025. He was invited to present the ASM Edward DeMille Campbell Memorial Lecture in 2022, and the Inaugural Srikumar Banerjee Memorial Lecture in 2022. He has published over 470 papers in scholarly journals and given over 410 invited presentations. He has graduated over 73 doctoral students and 41 students graduating with the degree of M.S.
|ABSTRACT
The advent of refractory high entropy alloys (RHEA) has afforded the materials community an opportunity regarding the development of new (and improved) high temperature alloys. For very high temperature applications, it is necessary to make use of alloying elements that will respond to such temperatures (e.g., usually elements with high atomic numbers), and combinations of these elements usually result in microstructures consisting of a bcc phase and a B2 ordered intermetallic phase. Either of these phases may be continuous. In this talk, the transformation pathways that produce attractive microstructures in these alloys will be described briefly. Thus, such microstructures are often the result of a spinodal transformation, and fairly refined microstructures may be formed. Of interest is the detailed characterization of the microstructures, such as the nature of the interfaces (coherent, semi-coherent, or incoherent), and the details of the ordering scheme in the B2 compound when consisting of a number of alloying elements. The deformation mechanisms operating in these B2/bcc alloys has been characterized and the results will be presented in this talk.