Abstract: Nanolayered composites such as Cu-Nb are used as model systems to explore the interaction of interphase boundaries with defects introduced via plastic deformation or ion irradiation. The results of these experimental studies are integrated with atomistic modeling and dislocation theory to provide insight into the unprecedented combination of properties achieved in certain nanolayered composites such as ultra-high flow strengths, high plastic flow stability, high fatigue strength, high thermal stability, high sink strength for radiation-induced point defects and trapping of helium in the form of stable clusters at interfaces. The results on “bottom-up” synthesized model systems are compared with “top down” accumulative roll bonding (ARB) processed bulk Cu-Nb nanolayered composites. A quantification of the defect-interface interactions as well as the processing-interface structure relationship allows the development of materials design concepts with controlled interface structures in nanocomposites to achieve tailored response in engineering applications.
Bio: Amit Misra is a Professor and the Department Chair of Materials Science and Engineering at the University of Michigan, Ann Arbor. Dr. Misra earned his MS (’91) and PhD (’94) degrees in Materials Science and Engineering from the University of Michigan, Ann Arbor, MI under the supervision of Prof. Ron Gibala, and B. Tech. degree in Metallurgical Engineering from the Institute of Technology, Banaras Hindu University (now IIT-Varanasi), India.
His primary research expertise is in light-weight structural materials, radiation-damage tolerant materials, high strength and high electrical conductivity materials and other metal-based multiphase and composite materials, with emphasis on designing materials with enhanced functionality through understanding and control of interface and defect phenomena.