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DE-SC0016306: Collaborative Research: The Role of Grain Boundary Structure and Chemistry in Materials Failure

Award Status: Inactive
  • Institution: Arizona Board of Regents, The University of Arizona, Tucson, AZ
  • DUNS: 806345617
  • PM: Vetrano, John
  • Most Recent Award Date: 04/26/2017
  • Number of Support Periods: 1
  • PI: Aifantis, Katerina
  • Current Budget Period: 07/15/2016 - 07/14/2017
  • Current Project Period: 07/15/2016 - 07/14/2017
  • Supplement Budget Period: N/A
 

Public Abstract

Macroscopic mechanical testing has revealed that chemical segregation at grain boundaries results in a change of the Hall-Petch slope, indicating a change in grain boundary strengthening due to the presence of solute atoms.  The project will study the role of chemical segregation on the local yielding of grain boundaries using nano-indentation and in situ transmission electron microscopy to isolate the segregation effect on dislocation-boundary interaction. In the case of segregation induced grain boundary strengthening the experimental results will be considered within a macroscopic framework that the grain boundary energy increases with plastic strain using the atomistic hypothesis that the initial grain boundary deformation causes a disruption of the lowest energy solute atom configuration.



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