Dynamics and Cohesion of Materials Interfaces and Confined Phases Under Stress

Project Coordinators:

Mark Asta
Department of Chemical Engineering and Materials Science
University of California Davis
Davis, CA 95616

Alain Karma
Physics Department
Northeastern University
Boston, MA 02115

Tony Rollett
Department of Materials Science and Engineering
Carnegie Mellon University
Pittsburgh, PA 15213

Project Description:

This project brings together a team of researchers with a highly successful record of collaboration under previous CMSN support, to address new and outstanding scientific issues related to the properties of grain boundaries and associated confined interfacial liquid phases under stress. The project addresses challenging new methodological developments required to understand at a fundamental level the physics governing complex interface dominated processes associated with the breakdown of crystal cohesion and failure of stressed polycrystalline materials. This new focus represents a natural extension, and stronger unification, of the team's previous collaborations examining grain boundary and solid-liquid interface properties, and their role in governing microstructure evolution. In the currrent project, development and validation of multiscale simulation methodologies are being undertaken in the context of four technologically-important and thematically-linked processes relevant to the processing and lifetime of materials for diverse DOE-related applications ranging from energy generation to stockpile stewardship. Specifically, we are seeking to gain new insights into the mechanisms of whisker growth, liquid-metal embrittlement, hot tearing and hot-ductility-dip cracking, with an overall goal of developing predictive models to aid in the prevention or control of these phenomena in practical applications.

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