skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Quantifying the influence of twin boundaries on the deformation of nanocrystalline copper using atomistic simulations

Journal Article · · International Journal of Plasticity
 [1];  [2]
  1. Drexel Univ., Philadelphia, PA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Over the past decade, numerous efforts have sought to understand the influence of twin boundaries on the behavior of polycrystalline materials. Early results suggested that twin boundaries within nanocrystalline face-centered cubic metals have a considerable effect on material behavior by altering the activated deformation mechanisms. In this work, we employ molecular dynamics simulations to elucidate the role of twin boundaries on the deformation of <100> columnar nanocrystalline copper at room temperature under uniaxial strain. We leverage non-local kinematic metrics, formulated from continuum mechanics theory, to compute atomically-resolved rotational and strain fields during plastic deformation. These results are then utilized to compute the distribution of various nanoscale mechanisms during straining, and quantitatively resolve their contribution to the total strain accommodation within the microstructure, highlighting the fundamental role of twin boundaries. Our results show that nanoscale twins influence nanocrystalline copper by altering the cooperation of fundamental deformation mechanisms and their contributed role in strain accommodation, and we present new methods for extracting useful information from atomistic simulations. The simulation results suggest a tension–compression asymmetry in the distribution of deformation mechanisms and strain accommodation by either dislocations or twin boundary mechanisms. In highly twinned microstructures, twin boundary migration can become a significant deformation mode, in comparison to lattice dislocation plasticity in non-twinned columnar microstructures, especially during compression.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1182988
Alternate ID(s):
OSTI ID: 1252306
Report Number(s):
SAND-2014-15386J; 533801
Journal Information:
International Journal of Plasticity, Vol. 65; ISSN 0749-6419
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

References (59)

Strain rates in molecular dynamics simulations of nanocrystalline metals journal December 2009
The role of copper twin boundaries in cryogenic indentation-induced grain growth journal January 2014
Cryogenic indentation-induced grain growth in nanotwinned copper journal May 2013
Dislocation nucleation from bicrystal interfaces and grain boundary ledges: Relationship to nanocrystalline deformation journal November 2007
Deformation Twinning in Nanocrystalline Aluminum journal April 2003
Specimen size and grain size effects on tensile strength of Ag microwires journal April 2011
Enhanced tensile strength and high ductility in cryomilled commercially pure titanium journal April 2009
Systematic analysis of local atomic structure combined with 3D computer graphics journal March 1994
Grown-in twin boundaries affecting deformation mechanisms in nc-metals journal December 2004
Dislocations emitted from nanocrystalline grain boundaries: nucleation and splitting distance journal December 2004
Twinning in Nanocrystalline fcc Metals journal February 2005
Nanocrystalline materials journal January 1989
Modeling dislocation nucleation strengths in pristine metallic nanowires under experimental conditions journal April 2013
High strength nanocrystalline cobalt with high tensile ductility journal October 2003
Optimization of strength and ductility in nanocrystalline and ultrafine grained metals journal October 2003
Mechanical behavior of nanocrystalline metals and alloys11The Golden Jubilee Issue—Selected topics in Materials Science and Engineering: Past, Present and Future, edited by S. Suresh journal November 2003
Dislocation nucleation governed softening and maximum strength in nano-twinned metals journal April 2010
Deformation mechanism in nanocrystalline Al: Partial dislocation slip journal July 2003
Strengthening Materials by Engineering Coherent Internal Boundaries at the Nanoscale journal April 2009
Ultrahigh Strength and High Electrical Conductivity in Copper journal April 2004
Instabilities and ductility of nanocrystalline and ultrafine-grained metals journal October 2003
Eight routes to improve the tensile ductility of bulk nanostructured metals and alloys journal April 2006
Strain hardening and large tensile elongation in ultrahigh-strength nano-twinned copper journal November 2004
Mechanical properties of nanocrystalline materials journal May 2006
Structural stability and lattice defects in copper: Ab initio , tight-binding, and embedded-atom calculations journal May 2001
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Atomic-scale modeling of plastic deformation of nanocrystalline copper journal October 2004
A Maximum in the Strength of Nanocrystalline Copper journal September 2003
Grain Boundary-Mediated Plasticity in Nanocrystalline Nickel journal July 2004
The Optimal Grain Sized Nanocrystalline Ni with High Strength and Good Ductility Fabricated by a Direct Current Electrodeposition journal June 2008
Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool journal December 2009
Nanotwinned fcc metals: Strengthening versus softening mechanisms journal December 2010
Grain boundary dislocation sources in nanocrystalline copper journal February 2008
Atomistic simulations of tension–compression asymmetry in dislocation nucleation for copper grain boundaries journal December 2008
Structural characterization of deformed crystals by analysis of common atomic neighborhood journal September 2007
Molecular dynamics simulations of rate-dependent grain growth during the surface indentation of nanocrystalline nickel journal June 2013
Investigating the deformation of nanocrystalline copper with microscale kinematic metrics and molecular dynamics journal March 2012
Shear deformation kinematics of bicrystalline grain boundaries in atomistic simulations journal December 2009
Continuum metrics for deformation and microrotation from atomistic simulations: Application to grain boundaries journal December 2011
Paradox of Strength and Ductility in Metals Processed Bysevere Plastic Deformation journal January 2002
Stacking fault energies and slip in nanocrystalline metals journal May 2004
Deformation in nanocrystalline metals journal May 2006
Quantitative description of plastic deformation in nanocrystalline Cu: Dislocation glide versus grain boundary sliding journal April 2008
Advanced TEM investigation of the plasticity mechanisms in nanocrystalline freestanding palladium films with nanoscale twins journal October 2012
Defective twin boundaries in nanotwinned metals journal May 2013
In situ observation of twin boundary migration in copper with nanoscale twins during tensile deformation journal December 2007
Scaling of maximum strength with grain size in nanotwinned fcc metals journal April 2011
Plasticity of metal nanowires journal January 2012
Deformation mechanisms, length scales and optimizing the mechanical properties of nanotwinned metals journal October 2011
Deformation-mechanism map for nanocrystalline metals by molecular-dynamics simulation journal December 2003
Ultrahigh strength and high ductility of bulk nanocrystalline copper journal August 2005
Strain rate effects on the mechanical response in multi- and single-crystalline Cu micropillars: Grain boundary effects journal November 2013
Tougher ultrafine grain Cu via high-angle grain boundaries and low dislocation density journal February 2008
A new look at the atomic level virial stress: on continuum-molecular system equivalence journal September 2003
Modelling the plastic deformation of nanostructured metals with bimodal grain size distribution journal March 2012
Modeling grain size dependent optimal twin spacing for achieving ultimate high strength and related high ductility in nanotwinned metals journal August 2011
Deformation gradients for continuum mechanical analysis of atomistic simulations journal January 2009
Calculation of stress in atomistic simulation journal June 2004
Surface Step Effects on Nanoindentation journal October 2001

Cited By (6)

Grain-Size-Dependent Grain Boundary Deformation during Yielding in Nanocrystalline Materials Using Atomistic Simulations journal February 2020
Tension-compression asymmetry in plasticity of nanotwinned 3C-SiC nanocrystals journal September 2018
Nucleation of ripplocations through atomistic modeling of surface nanoindentation in graphite journal May 2018
Mechanical properties of stabilized nanocrystalline FCC metals journal September 2019
Molecular dynamics simulation studies on mechanical properties of standalone ligaments and networking nodes, a connection to nanoporous material journal September 2018
Nanotwinned and hierarchical nanotwinned metals: a review of experimental, computational and theoretical efforts journal February 2018