Strong and Ductile High-Entropy Alloys for Cryogenic to Elevated Temperature Applications

Abstract:
The tunable properties of multi-principal element alloys, also commonly known as high-entropy alloys (HEAs), provide a remarkable opportunity for the development of superior materials for critical structural applications that involve extreme conditions. In this talk, an optimization approach for HEAs, at both low and high temperature ranges, will be described and related strengthening and deformation mechanisms will be discussed. Moreover, our latest work on the mechanical behavior and deformation of  both FCC and BCC HEAs across a broad range of temperatures will be presented. In this lecture I will describe an alloy design strategy for super formability at ambient temperature and related mechanisms, in the case of BCC refractory HEAs.  Finally, the influence of a heterogeneous microstructure on mechanical behavior of these HEAs, at both cryogenic and elevated temperatures, will be introduced. 

Biography:
Enrique J. Lavernia, is currently a faculty member in the Department of Materials Science and Engineering, University of California, Irvine. Lavernia earned a B.S. in Solid Mechanics from Brown University in 1982; an M.S. in Metallurgy in 1984; and a Ph.D. in Materials Engineering in 1986, both from the Massachusetts Institute of Technology.  He has served as dean of the UC Davis College of Engineering (2002-2015) and as provost and executive vice chancellor of UC Irvine (2015-2020).  Lavernia was elected to the National Academy of Engineering in 2013, he is also a fellow of several professional societies, including TMS, ASM, and MRS and his research has been recognized with various professional awards.  His research interests include the processing and behavior of structural materials (including high entropy materials) with particular emphasis on processing (i.e., powder techniques and additive manufacturing) fundamentals and mechanical behavior.