Events Calendar

Mork Family Department of Chemical Engineering and Materials Science Seminar - Distinguished Lecture Series

Speaker: Professor Megumi Kawasaki , School of Mechanical, Industrial and Manufacturing Engineering, Oregon State University

Talk Title: Processing of bulk nanostructured materials through the application of high-pressure torsion

Abstract: The processing of metals through the application of severe plastic deformation (SPD) has attracted much attention for the production of ultrafine-grained (UFG) metals and bulk nanostructured materials (BNM). Among the SPD techniques, high-pressure torsion (HPT) provides the potential for achieving true nanometer grains by processing metal disks under a high compressive pressure and concurrent torsion straining. These ultrafine grains in the bulk metals usually show superior mechanical and physical properties. Especially, the development of micro-mechanical behavior is observed after significant changes in microstructure after processing and it is of great importance for obtaining practical future applications of these UFG metals. Moreover, recent studies show the potential for using HPT for the rapid fabrication of nanocomposites. Accordingly, this presentation demonstrates the basic understanding of processing of UFG and BNM by HPT and the evolution of microstructure and mechanical properties after HPT on various metallic alloys and metal-matrix nanocomposites. Special emphasis is placed on demonstrating a simple and very rapid synthesis of metal-matrix nanocomposites by HPT at ambient temperature. These synthesized hybrid systems exhibit exceptionally high specific strength through deformation-induced diffusion and the simultaneous formation of a few different intermetallic compounds. These experimental findings suggest a considerable potential for making use of HPT for the introduction of UFG microstructure and fabrication of a wide range of hybrid materials.

Host: Dr. Kassner

Location: John Stauffer Science Lecture Hall (SLH) - 200

Audiences: Everyone Is Invited

Contact: Karen Woo/Mork Family