ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Mapping phase transformation pathways in materials and linking it to pro-cessing-microstructure-property relationships

Date: 19.11.2020
Time: 04:00 p.m.
Place: Online meeting Zoom

Arun Devaraj, Pacific Northwest National Laboratory, Richland, USA

Materials scientists studying processing-microstructure-property relationships dream of knowing how the processing influences the exact location of each atom in a material and how that impacts its properties. Such detailed understanding of material microstructure can inform novel material processing approaches such as solid phase processing to design breakthrough materials with better properties and performance. This same ideal applies to researchers interested in understanding how materials degrade in extreme environments, such as neutron irradiation in nuclear fission and fusion reactors, hot, corrosive environments in internal combustion engines, and high voltages in batteries. Understanding material degradation enables researchers to design long-lasting, damage-tolerant, high-performance materials. Often, no single characterization method can provide information on materials from the physical component level down to atomic scale, so multiple imaging methods must be seamlessly integrated. At Pacific Northwest National Laboratory (PNNL), to address key scientific questions about materials relevant to U.S. Department of Energy (DOE) research priorities, we couple methods spanning aberration corrected electron microscopy, atom probe tomography, synchrotron-based x-ray absorption spectroscopy, and high energy x-ray diffraction to enable comprehensive understanding of the relationships between material processing, microstructure, properties, and performance. This correlative multimodal imaging can also provide information at length scales relevant to predictive materials modeling. This talk will describe correlative multimodal material characterization to understand phase transformations and microstructure-property relationships in materials, which in turn can enable design of novel engineered materials, using examples including lightweight automotive structural alloys, metallic nuclear materials, energy storage materials, and biological materials such as tooth enamel.

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