Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Small-Angle Twist Grain Boundaries as Sinks for Point Defects

Journal Article · · Scientific Reports
 [1];  [2]
  1. Univ. of Wisconsin, Madison, WI (United States); OSTI
  2. Univ. of Wisconsin, Madison, WI (United States)
It is known that grain boundaries (GBs) provide sinks for defects induced into a solid by irradiation. At the same time radiation can change the atomic structure and chemistry of GBs, which in turn impacts the ability of GBs to continue absorbing defects. Although a number of studies have been reported for tilt GBs acting as defect sinks, the questions of how twist GBs evolve to absorb non-equilibrium concentrations of defects and whether GBs saturate as defect sinks for typical irradiation conditions have remained largely unanswered. Here, we used a combination of molecular dynamics and grand canonical Monte Carlo simulations to determine how twist GBs accommodate point defects. We used SiC and {001} and {111} twist GBs as model systems. We found that diffusion of defects along GBs in this material is slow and for most experimentally relevant conditions point defects will accumulate at twist GBs, driving structural and chemical evolution of these interfaces. During irradiation, screw dislocations within GB planes absorb interstitials by developing mixed dislocation segments that climb. Formation of mixed dislocations occurs either by nucleation of interstitial loops or by faulting/unfaulting of stacking faults. Furthermore both types of twist GBs can accommodate a high density of interstitials without losing the crystalline structure, irrespectively of the interstitial flux.
Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-08ER46493
OSTI ID:
1500100
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 8; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

References (56)

Mechanisms of Dislocation Climb journal January 1969
Non-coherent Cu grain boundaries driven by continuous vacancy loading journal March 2015
Molecular dynamics simulation of screw dislocations interacting with interstitial frank loops in a model FCC crystal journal February 2004
Structure and energy of (111) low-angle twist boundaries in Al, Cu and Ni journal February 2013
Atomistic, generalized Peierls–Nabarro and analytical models for (111) twist boundaries in Al, Cu and Ni for all twist angles journal May 2014
Kinetic Monte Carlo simulation of the effective diffusivity in grain boundary networks journal October 2014
Impact of segregated interstitials on structures and energies of tilt grain boundaries in Mo journal February 2016
Global transition path search for dislocation formation in Ge on Si(001) journal August 2016
Atomic modeling of irradiation-induced hardening journal April 2008
Ag diffusion in cubic silicon carbide journal January 2011
Effects of atomic grain boundary structures on primary radiation damage in α-Fe
  • Esfandiarpour, A.; Feghhi, S. A. H.; Shokri, A. A.
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 362 https://doi.org/10.1016/j.nimb.2015.08.074
journal November 2015
Defect-interface interactions journal October 2015
Silicon carbide as an inert-matrix for a thermal reactor fuel journal August 1999
Structural materials for fission & fusion energy journal November 2009
The relationship between grain boundary structure, defect mobility and grain boundary sink efficiency journal March 2015
The Multiple Roles of Small-Angle Tilt Grain Boundaries in Annihilating Radiation Damage in SiC journal February 2017
A climbing image nudged elastic band method for finding saddle points and minimum energy paths journal December 2000
Automated identification and indexing of dislocations in crystal interfaces journal October 2012
Atomic-level computer simulation of the interaction between $\frac{1}{3}\langle 1\,1\,\bar{2}\,0 \rangle\{1\,\bar{1}\,0\,0\}$ dislocations and $\frac{1}{3}\langle 1\,1\,\bar{2}\,0 \rangle$ interstitial loops in α -zirconium journal April 2013
Stacking faults in group-IV crystals: An ab initio study journal July 1998
Atomistic study of intrinsic defect migration in 3C-SiC journal June 2004
Simulations of the mechanical properties of crystalline, nanocrystalline, and amorphous SiC and Si journal February 2007
Point defect absorption by grain boundaries in α -iron by atomic density function modeling journal December 2015
Amorphization Driven by Defect-Induced Mechanical Instability journal October 2013
Efficient Annealing of Radiation Damage Near Grain Boundaries via Interstitial Emission journal March 2010
Interaction between mobile dislocations and perfect dislocation loops in Fe-Ni-Cr austenitic alloy systems journal March 2015
Grain-boundary source/sink behavior for point defects: An atomistic simulation study journal April 2009
Structural phase transformations in metallic grain boundaries text January 2012
Energetics of vacancy segregation to symmetric tilt grain boundaries in HCP materials text January 2013
Accelerated atomistic simulation study on the stability and mobility of carbon tri-interstitial cluster in cubic SiC text January 2016
Silicon carbide as an inert-matrix for a thermal reactor fuel journal August 1999
Empirical potential approach for defect properties in 3C-SiC journal May 2002
Structural materials for fission & fusion energy journal November 2009
Accelerated atomistic simulation study on the stability and mobility of carbon tri-interstitial cluster in cubic SiC journal June 2014
Radiation effects in SiC for nuclear structural applications journal June 2012
Ab initio based rate theory model of radiation induced amorphization in β-SiC journal July 2011
Atomic Resolution Imaging of Black Spot Defects in Ion Irradiated Silicon Carbide journal August 2015
Atomistic Modeling of Point Defects and Diffusion in Copper Grain Boundaries journal January 2003
Interaction of Point Defects with Grain Boundaries in fcc Metals journal October 2003
Structural phase transformations in metallic grain boundaries journal May 2013
Energetics of vacancy segregation to symmetric tilt grain boundaries in hexagonal closed pack materials journal December 2013
Effect of Grain Boundary Stresses on Sink Strength journal November 2013
Quantifying grain boundary damage tolerance with atomistic simulations journal September 2016
Stacking faults in group-IV crystals: An ab initio study journal July 1998
Stacking faults in 3 C − ,   4 H − , and 6 H − SiC polytypes investigated by an ab initio supercell method journal April 2003
Electron-beam-induced amorphization in SiC journal October 2003
Atomistic study of intrinsic defect migration in 3C-SiC journal June 2004
Volume swelling of amorphous SiC during ion-beam irradiation journal July 2005
Simulations of the mechanical properties of crystalline, nanocrystalline, and amorphous SiC and Si journal February 2007
Tunable helium bubble superlattice ordered by screw dislocation network journal August 2011
Structure of a 2 ∘ (010) Cu twist boundary interface and the segregation of vacancies and He atoms journal February 2012
Probing grain boundary sink strength at the nanoscale: Energetics and length scales of vacancy and interstitial absorption by grain boundaries in α -Fe journal February 2012
Atomistic modeling of long-term evolution of twist boundaries under vacancy supersaturation journal December 2012
Point defect absorption by grain boundaries in α -iron by atomic density function modeling journal December 2015
Radiation-induced mobility of small defect clusters in covalent materials journal July 2016
Amorphization Driven by Defect-Induced Mechanical Instability journal October 2013

Similar Records

The multiple roles of small-angle tilt grain boundaries in annihilating radiation damage in SiC
Journal Article · Wed Feb 08 19:00:00 EST 2017 · Scientific Reports · OSTI ID:1347521

Sink strength and dislocation bias of three-dimensional microstructures
Journal Article · Mon May 27 20:00:00 EDT 2019 · Physical Review Materials · OSTI ID:1772414

Complex dislocation loop networks as natural extensions of the sink efficiency of saturated grain boundaries in irradiated metals
Journal Article · Thu May 02 20:00:00 EDT 2024 · Science Advances · OSTI ID:2472114

Related Subjects