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Morphological Instability of Grain Boundaries in Two-Phase Coherent Solids

Journal Article · · Physical Review Letters
 [1];  [2];  [2]
  1. Northeastern Univ., Boston, MA (United States); Northeastern University
  2. Northeastern Univ., Boston, MA (United States)
We show both computationally and analytically that grain boundaries that exhibit shear-coupled motion become morphologically unstable in solid alloys that phase separate into coherent domains of distinct chemical compositions. Here, we carry out simulations of continuum models demonstrating that this instability is mediated by long-range elastic interaction between compositional domains and grain boundaries. In addition, we perform a linear stability analysis that predicts the range of unstable wavelengths in good quantitative agreement with simulations. In nonlinear stages, this pattern-forming instability leads to the breakup of low-angle grain boundaries, thereby strongly impacting microstructural evolution in a wide range of phase-separating materials.
Research Organization:
Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-07ER46400
OSTI ID:
1906116
Alternate ID(s):
OSTI ID: 1181186
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 10 Vol. 114; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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