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Materials Science at Oregon State University

Origin of Diffuse Intensities in Selected Area Electron Diffraction Patterns from Alloy 690 and Other FCC Alloys - PLEASE NOTE - Seminar is on FRIDAY at 3pm in Rogers 226

Date: Friday, Jan 16th
Presenter: Dr. Michael Kaufman, Metallurgical and Materials Engineering, Colorado School of Mines

Abstract


In many solid state materials a detailed knowledge of the crystallography leads to an adequate understanding of its physical properties. The most common technique used to study the structure of a material is to look at the Bragg scattering from powder diffraction. Complex modern materials, however, often do not conform to the simple periodic structural model that is assessed via Bragg diffraction. Still other important materials such as amorphous compounds do not crystallize at all, exhibiting only short-range order. Structure analysis of these complex materials requires an approach different from traditional diffraction techniques. Total scattering, also known as the Pair Distribution Function method (PDF), is highly useful because it can probe the long-, medium- and short-range ordering in materials. The technique is highly underutilized, but is an incredibly powerful tool for gaining an understanding of the structure-property relationships in complex materials. This talk will provide an overview of the technique and discuss specific examples relevant to the materials science community.

Bio:
Michael Kaufman is currently serving as the interim dean of the College of Applied Science and Engineering. Prior to stepping into this interim role, he served as the department head and director of the electron microscopy laboratory in the Department of Metallurgical and Materials Engineering at the Colorado School of Mines. Before joining CSM in 2007, he was professor and chair of the Materials Science and Engineering Department at the University of North Texas and, before that, he spent 15 years on the faculty in Materials Science and Engineering at the University of Florida, 3 years at the University of Washington and 2 years at the National Institute of Science and Technology (NIST). His background is the physical metallurgy of structural materials with an emphasis on characterization using advanced analytical techniques, primarily transmission electron microscopy. He received his BS and PhD degrees in Metallurgical Engineering from the University of Illinois in Urbana-Champaign.