When 10:30 AM - 11:30 AM Mar 27, 2015
Where 1670 Beyster Building
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Characterizing Novel Deformation Mechanisms in Superalloys

Michael Mills
Ohio State University of Michigan, Department of Materials Science and Engineering

The international initiative on Integrated Computational Materials Engineering holds great promise for accelerating the insertion of new materials in high performance structural applications. Achieving this aim relies upon the fidelity of materials models and their ability to capture the connectivity between processing, microstructure and performance. This presentation will focus on advancements in our ability to characterize deformation mechanisms at finer length-scales – from atomic to grain-level behavior. In the Ni-base superalloys, a surprising variety of governing mechanisms are observed as a function of microstructure and deformation condition. In particular, at elevated temperature, the strain rate and temperature dependence of deformation depends on the onset of several deformation mechanisms that are quite distinct from the “classic” APB shearing process that dominates at lower temperature. Using electron-microscopy-based techniques, new insights into the governing deformation mechanisms in several important structural materials are being developed. The important interplay between characterization and modeling at several length-scales (atomistic, phase field and crystal plasticity) in elucidating rate-limiting processes will also be discussed.

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