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Quantifying Material Microstructures with Quaternions Christopher A. Schuh, Massachusetts Institute of Technology, DMR 0855402.
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Quantifying Material Microstructures with QuaternionsChristopher A. Schuh, Massachusetts Institute of Technology, DMR 0855402 To design new materials with exemplary properties, we must understand and control the microstructure—the crystal grains and the interfaces between them. Many important material properties—e.g. conductivity in p-Si solar cells, or resistance to stress-corrosion cracking in nuclear reactor steam generator tubing—depend upon not only the character of the interfaces, but also that of their intersections: triple junctions. We have developed the mathematical tools to extract information about the character of triple junctions in a material based only on the crystal orientations. These tools will allow us to manipulate the character of triple junctions by taking advantage of the known relationships between processing and crystal orientations. • Distribution of triple junction types in an experimental microstructure (above), the 6-D function required to describe the triple junction space (right)
Quantifying Material Microstructures with Quaternions Christopher A. Schuh, Massachusetts Institute of Technology, DMR 0855402 Our project also has broader impacts on society through… …Outreach …Education At MIT, we integrate research and teaching to train the next generation of scientific leaders. Postdoctoral, graduate and undergraduate students have all participated in this research. We also invite students and researchers from industry, from other US institutions, and from abroad, to visit MIT and participate in collaborative research. For example, in the past two years we have hosted visitors fromMitsubishi Materials Corporation, Japan, who worked at MIT for 12 months each. SrikanthPatala, Ph.D. 2011 Ying Chen, postdoc Antoine Claisse, B.S. 2011 Oliver Johnson, Ph.D. in progress Amy Plunk Topic: Thermodynamic stability of grain boundaries in alloys Dr. Makoto Igarashi Topic: grain boundary engineering in ceramics …Dissemination of Science Patala, S. and Schuh, C.A., Computers, Materials and Continua, 17:1, p1-17, 2010 Patala, S. and Schuh, C.A., Acta Materialia59:2, p554-562, 2011 Patala, S. And Schuh, C.A., Philosophical Magazine, 91, 1489-1508, 2011 An important part of our work is to disseminate the new knowledge that we generate through our research. In each year of our program we publish scholarly articles, as well as attend and present at international conferences. Our most recent publications are listed at the right:
