Abstract:
:The formation and migration of disconnections (line defects constrained to the grain boundary [GB] plane with both dislocation and step character) control many of the kinetic and dynamical properties of GBs and the polycrystalline materials of which they are central constituents. We demonstrate that GBs undergo a finite-temperature topological phase transition of the Kosterlitz-Thouless (KT) type. This phase transition corresponds to the screening of long-range interactions between (and unbinding of) disconnections. This phase transition leads to abrupt changes in the behavior of GB migration, GB sliding, and roughening. We analyze this KT transition through mean-field theory, renormalization group theory, and kinetic Monte Carlo simulations and examine how this transition affects microstructure-scale phenomena such as grain growth stagnation, abnormal grain growth, and superplasticity.
journal_name
Proc Natl Acad Sci U S Aauthors
Chen K,Srolovitz DJ,Han Jdoi
10.1073/pnas.2017390117subject
Has Abstractpub_date
2020-12-29 00:00:00pages
33077-33083issue
52eissn
0027-8424issn
1091-6490pii
2017390117journal_volume
117pub_type
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