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Grain Boundary Migration: A Disconnection Perspective

April 27 @ 11:00 am - 12:00 pm

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Abstract:

This talk addresses how grain boundaries (GBs) migrate under a range of different driving forces. Our approach is based on a description of the motion of crystallographic line defects in GB,; i.e., disconnections. First, I will review the relationship between disconnections and the underlying bicrystallography; this relationship determines the set of all allowed Burgers vector and step heights (geometric properties of disconnections) for each GB {b,h}. Next, I will show how GBs move under no driving force and for different driving forces.  In particular, I will discuss GB roughening, intrinsic mobility, and why GB mobility depends on the nature of the driving force. These results will be compared with both atomistic simulation and experiment. Next, I apply this picture to understand the motion GBs in a bicrystal and derive a continuum equation of motion for GBs and then turn to the role of triple junctions (TJs) and show that it is remarkable that TJ move at all. I’ll end by discussing  what it takes to move a GB,  how the flexibility of GB dynamics make this possible and the consequences for GB migration in polycrystals.

Biography:

David Srolovitz is the author of 500 papers on topics in materials theory and simulations ranging from defects (surfaces, grain boundaries, dislocations, point defects), microstructure evolution (grain growth, dislocations, stress effects, phase transformations), deformation (nanomaterials, dislocation motion, creep), and film growth (sputtering, evaporation, CVD) and has an h-index of 83 with more than 26,000 literature citations.  He is a Member of the National Academy of Engineering, Fellow of MRS, TMS, ASM, Institute of Physics and is the winner of the 2013 MRS Materials Theory Award.  Srolovitz did his undergraduate work in Physics at Rutgers University and PhD from the University of Pennsylvania.  He was a staff member at Exxon Corporate Research and Los Alamos National Laboratory early in his career and then was professor at the University of Michigan (Materials Science and Applied Physics), Princeton University (Mechanical and Aerospace Engineering, Applied Mathematics), and the University of Pennsylvania (Mechanical Engineering and Applied Mechanics), where he is currently the Joseph Bordogna Professor of Engineering and Applied Science and Director of the Penn Institute for Computational Science.  He also served as the Executive Director of the Institute of High Performance Computing and the Scientific Director of the Science and Engineering Research Council in Singapore.

Details

Date:
April 27
Time:
11:00 am - 12:00 pm
Event Categories:
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Event Tags:
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Organizer

MSE Department
Phone:
919.515.2377
Website:
https://www.mse.ncsu.edu

Other

Speaker
Prof. David Srolovitz

Venue

EB1 – Room 1011
911 Partners Way
Raleigh, NC 27695-7907 United States
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