Events for the 1st week of February
-
Mork Family Department of Chemical Engineering and Materials Science Seminar - Distinguished Lecture Series
Tue, Jan 29, 2019 @ 04:00 PM - 05:20 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
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
-
PhD Defense
Fri, Feb 01, 2019 @ 01:01 PM - 02:00 PM
Mork Family Department of Chemical Engineering and Materials Science
Conferences, Lectures, & Seminars
Speaker: Shanyuan Niu, Ph.D. Candidate, Materials Science
Talk Title: Perovskite Chalcogenides: Emerging Semiconductors for Visible to Infrared Optoelectronics
Abstract: Rational design of new materials or identification of novel functionalities in underexplored materials, especially semiconductors, has been a key contributor to various electronic, photonic, and energy technologies. Transition metal perovskite chalcogenides (TMPCs), an emerging class of materials with rich tunability and functionality, are explored as stable, environmentally friendly semiconductors for optoelectronic applications. They can be viewed as the inorganic alternatives to hybrid halide perovskites, and chalcogenide counterparts of perovskite oxides with desirable optoelectronic properties in the visible to infrared part of the electromagnetic spectrum. TMPCs with perovskite and related structures can adopt three-dimensional, quasi-two-dimensional, and quasi-one-dimensional structural networks. Shanyuan will talk about the synthesis, characterization, and physical properties of TMPCs. The focus will be on several branches, including photovoltaic potential and anomalous bandgap evolution in three-dimensional and quasi-two-dimensional TMPCs, and building infrared optical anisotropy in quasi-one-dimensional TMPCs.
Location: Charles Lee Powell Hall (PHE) - 223
Audiences: Everyone Is Invited
Contact: Karen Woo/Mork Family