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Title: Glide dislocation nucleation from dislocation nodes at semi-coherent {111} Cu–Ni interfaces

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [4]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
  2. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
  4. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

Using atomistic simulations and dislocation theory on a model system of semi-coherent {1 1 1} interfaces, we show that misfit dislocation nodes adopt multiple atomic arrangements corresponding to the creation and redistribution of excess volume at the nodes. We identified four distinctive node structures: volume-smeared nodes with (i) spiral or (ii) straight dislocation patterns, and volume-condensed nodes with (iii) triangular or (iv) hexagonal dislocation patterns. Volume-smeared nodes contain interfacial dislocations lying in the Cu–Ni interface but volume-condensed nodes contain two sets of interfacial dislocations in the two adjacent interfaces and jogs across the atomic layer between the two adjacent interfaces. Finally, under biaxial tension/compression applied parallel to the interface, we show that the nucleation of lattice dislocations is preferred at the nodes and is correlated with the reduction of excess volume at the nodes.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Materials at Irradiation and Mechanical Extremes (CMIME); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-06NA25396; 2008LANL1026: LDRD-ER20140450; 2008LANL1026; LDRD-ER20140450
OSTI ID:
1329583
Alternate ID(s):
OSTI ID: 1251481
Report Number(s):
LA-UR-15-21602
Journal Information:
Acta Materialia, Vol. 98, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 72 works
Citation information provided by
Web of Science

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Cited By (8)

Cooperative dissociations of misfit dislocations at bimetal interfaces journal November 2016
Surface flaws control strain localization in the deformation of Cu|Au nanolaminate pillars journal July 2019
Dislocation Interaction and V-Shaped Growth of the Distorted Structure During Nanoindentation of Cu20Ni20Al20Co20Fe20 (high-entropy alloy)-Coated Copper: A Molecular Dynamics Simulation-Based Study journal January 2019
Structures and Mechanical Properties of Al-Al2Cu Interfaces journal January 2019
Micro-scale modeling of interface-dominated mechanical behavior journal October 2017
Enhanced co-deformation of a heterogeneous nanolayered Cu/Ni composite journal December 2019
Molecular dynamics simulation of nanoindentation on Cu/Ni nanotwinned multilayer films using a spherical indenter journal October 2016
Inapparent Strengthening Effect of Twin Interface in Cu/Pd Multilayered Films with a Large Lattice Mismatch journal December 2019

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