News: Eventi

Radiation Tolerance of Nanostructured Amorphous-Ceramic/Meta Composites

Seminario del Prof. Michael Nastasi

Director, Nebraska Center for Energy Sciences Research
Department of Mechanical and Materials Engineering
University of Nebraska-Lincoln
Lincoln, NE (U.S.A.)

Dove: Aula RH03 Via Marzolo, 9
Quando: 16 luglio 2018 alle ore 14.30


Abstract

A major challenge to developing materials with radically extended performance limits at irradiation extremes will require designing and perfecting atom- and energy- efficient synthesis of revolutionary new materials that maintain their desired properties while being driven very far from equilibrium. We examined the radiation tolerance of amorphous silicon oxycarbide (SiOC) and crystalline Fe nanocomposites. Our research shows that amorphous SiOCs are extremely stable even under irradiations to 20 dpa at 600 oC. Nanocomposites of these materials with crystalline Fe are also extremely stable. Characterization shows neither sign of point defect clusters in Fe layers, nor an indication of crystallization or new phase formation in SiOC layers. Our findings suggest that the crystalline/amorphous interface and Fe grain boundaries can help to annihilate point defects generated during irradiation, and therefore enhance radiation tolerance properties.

This presentation will focus on these and other results and their implications.

Bio

Dr. Michael Nastasi is the Director of the Nebraska Center for Energy Sciences Research (NCESR) at the University of Nebraska-Lincoln (UNL). He is also the Elmer Koch Professor of Mechanical and Materials Engineering. Mike received his BS (1981), MS (1983) and PhD (1986) degrees from the Materials Science and Engineering Department at Cornell University.

Prior to coming to UNL in January 2012, Mike was a Laboratory Fellow, staff scientist, and Director of the Energy Frontier Research Center on Materials at Irradiation and Mechanical Extreme at Los Alamos National Laboratory (1985 – 2011)

Mike's personal research interests include ion-solid interactions, irradiation induced phase transformations, ion irradiation and plasma modification of materials, ion beam analysis of materials, synthesis and properties of high strength nanolayered composites, and surface mechanical properties.

Mike's work in these areas has resulted in several awards including the 1995 Los Alamos National Laboratory Fellows Prize for his extensive research in ion-solid interactions and the R&D 100 Award in 1997 for Plasma Source Ion Implantation for Enhancing Materials Surfaces.

He was appointed a Los Alamos National Laboratory Fellow in the summer of 2000, was elected Fellow of the American Physical Society in 2006, elected Fellow of Materials Research Society in 2011, and elected Fellow of the American Association for the Advancement of Science in 2012.

Mike has served as an adjunct professor at Arizona State University, the University of Maryland, and the University of Colorado, and has been a visiting professor at the University of Helsinki in Finland.

He has co-authored more than 550 refereed publications, authored the books entitled Ion-Solid Interactions: Fundamentals and Applications, published by Cambridge University Press in 1996, Ion Implantation and Synthesis of Materials, published by Springer-Verlag in 2006, and Ion Beam Analysis: Fundamentals and Applications, published by CRC Press in 2015, and edited several volumes including the MRS best seller, the Handbook of Modern Ion Beam Materials Analysis.