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

Title: Segregation-affected yielding and stability in nanotwinned silver by microalloying

Journal Article · · Physical Review Materials
 [1]; ORCiD logo [2]
  1. Univ. of Vermont, Burlington, VT (United States). Materials Science Program
  2. Univ. of Vermont, Burlington, VT (United States). Materials Science Program; Univ. of Vermont, Burlington, VT (United States). Dept. of Mechanical Engineering

Small-scale mechanics of solute atom segregation and incipient plasticity in nanotwinned Ag containing trace concentrations of Cu were studied by using large-scale hybrid Monte-Carlo and molecular-dynamic simulations. It is found that solute Cu atoms are segregated concurrently to grain boundaries and intrinsic twin-boundary kink-step defects during thermal annealing. Low Cu dopant contents below 1 at. % are predicted to substantially increase twin stability in nanotwinned Ag, accompanied with a pronounced rise in yield strength at 300 K. Incipient plasticity is associated with kink-step migration, grain-boundary sliding, and dislocation nucleation from grain boundaries and twin-boundary defects, which are affected by doping. Cu-dependent yield strengthening in doped nanotwinned Ag is shown to correlate with the critical stress required to initiate crystal slip emitted from grain boundaries and twin-boundary defects. Finally, these findings provide fundamental insight into the roles of twin-boundary imperfections on plastic yielding, and offer new clues to further extend the extraordinary stability and strength of nanotwinned metals by microalloying.

Research Organization:
Univ. of Vermont, Burlington, VT (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0016270; DMR-1410646; ACI-1548562
OSTI ID:
1410783
Alternate ID(s):
OSTI ID: 1410729
Journal Information:
Physical Review Materials, Vol. 1, Issue 6; Related Information: http://link.aps.org/supplemental/10.1103/PhysRevMaterials.1.063604; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

References (41)

Structure and migration of (112) step on (111) twin boundaries in nanocrystalline copper journal December 2008
Helium segregation to screw and edge dislocations in α-iron and their yield strength journal February 2015
Plastic anisotropy and associated deformation mechanisms in nanotwinned metals journal January 2013
Strengthening and plasticity in nanotwinned metals journal April 2016
Enhancement of strength and stability of nanostructured Ni by small amounts of solutes journal September 2011
Reaching theoretical strengths in nanocrystalline Cu by grain boundary doping journal October 2011
Epitaxial nanotwinned Cu films with high strength and high conductivity journal August 2008
Plasticity of nanocrystalline alloys with chemical order: on the strength and ductility of nanocrystalline Ni–Fe journal January 2013
Interplay between grain boundary segregation and electrical resistivity in dilute nanocrystalline Cu alloys journal October 2016
Cu/Ag EAM potential optimized for heteroepitaxial diffusion from ab initio data journal December 2009
Thermal stability of highly nanotwinned copper: The role of grain boundaries and texture journal November 2012
Ultrahigh Strength and High Electrical Conductivity in Copper journal April 2004
Grain boundary segregation, chemical ordering and stability of nanocrystalline alloys: Atomistic computer simulations in the Ni–W system journal July 2007
Revealing the Maximum Strength in Nanotwinned Copper journal January 2009
High strength, epitaxial nanotwinned Ag films journal January 2011
Plastic deformation of nanocrystalline Pd–Au alloys: On the interplay of grain boundary solute segregation, fault energies and grain size journal May 2011
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Defective twin boundaries in nanotwinned metals journal May 2013
Visualization and analysis of atomistic simulation data with OVITO–the Open Visualization Tool journal December 2009
Influence of intrinsic kink-like defects on screw dislocation – coherent twin boundary interactions in copper journal January 2017
Microstructural evolution, mechanical properties and deformation mechanisms of nanocrystalline Cu thin films alloyed with Zr journal September 2014
Stress-assisted grain growth in nanocrystalline metals: Grain boundary mediated mechanisms and stabilization through alloying journal June 2017
Optimization of strength and ductility in nanotwinned ultra-fine grained Ag: Twin density and grain orientations journal September 2015
XSEDE: Accelerating Scientific Discovery journal September 2014
Grain boundary doping strengthens nanocrystalline copper alloys journal October 2012
Transition of dislocation nucleation induced by local stress concentration in nanotwinned copper journal July 2015
Dislocation nucleation governed softening and maximum strength in nano-twinned metals journal April 2010
Nanocrystalline Al-Mg with extreme strength due to grain boundary doping journal June 2017
Morphology and mechanical properties of nanocrystalline Cu/Ag alloy journal January 2017
Nanotwinned fcc metals: Strengthening versus softening mechanisms journal December 2010
Thermal stability of twins and strengthening mechanisms in differently oriented epitaxial nanotwinned Ag films journal May 2013
Relationship between hardness and dislocation processes in a nanocrystalline metal at the atomic scale journal June 2011
Scalable parallel Monte Carlo algorithm for atomistic simulations of precipitation in alloys journal May 2012
Synthesis and microstructure of electrodeposited and sputtered nanotwinned face-centered-cubic metals journal April 2016
Effect of solute segregation on thermal creep in dilute nanocyrstalline Cu alloys journal June 2012
An atom probe study on Nb solute partitioning and nanocrystalline grain stabilization in mechanically alloyed Cu-Nb journal March 2017
On the mechanical performance and deformation of nanotwinned Ag journal April 2014
Periodic Segregation of Solute Atoms in Fully Coherent Twin Boundaries journal May 2013
The effect of nanotwins on the corrosion behavior of copper journal April 2014
Detwinning mechanisms for growth twins in face-centered cubic metals journal April 2010
Nouvelles applications des paramètres continus à la théorie des formes quadratiques. Deuxième mémoire. Recherches sur les parallélloèdres primitifs. journal July 1908

Cited By (2)

Atomistic modeling of interfacial segregation and structural transitions in ternary alloys journal November 2018
Ideal maximum strengths and defect-induced softening in nanocrystalline-nanotwinned metals journal September 2019