Columnar Grain-driven Plasticity and Cracking in Nanotwinned FCC Metals
Abstract
The mechanisms of strengthening and plasticity in columnar-grained metals with preferentially oriented nano-sized twins have been examined traditionally by considering dislocation processes, but rarely from the perspective of grain boundary (GB) deformation. Here, the effects of GB strain accommodation on plastic deformation in four different columnar-grained nanocrystalline nanotwinned (nt) face-centered-cubic metals (Cu, Ag, Al, and Ni) were studied by large-scale molecular dynamics simulations. It is observed that in tensile deformation parallel to coherent twin boundaries (CTBs), the dislocation mechanisms in each metal are identical and associated with GB emissions of jog and threading dislocations at small and large CTB spacings, respectively. However, CTB strengthening effects are increasingly more pronounced in columnar-grained nt metals as their shear modulus increases, which is rationalized by the dependence of GB stress concentrations on twin size, metal type and strain rate. Also, while flow stresses in nt-Cu, nt-Ag, and nt-Al metals increase linearly with decreasing CTB spacing, a maximum strength limit is reached in nt-Ni below a critical CTB spacing of 6 nm. The strength limit in nt-Ni results from columnar GB cracking induced by prominent GB sliding. For columnar-grained microstructures, GB sliding is equivalent in nt-Ag and nt-Al and slightly lower in nt-Cu butmore »
- Publication Date:
- Research Org.:
- Univ. of Vermont, Burlington, VT (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1778962
- Alternate Identifier(s):
- OSTI ID: 1782339
- Grant/Contract Number:
- SC0020054; DMR-1410646; ACI-1548562
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 212; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Coherent twin boundary; Grain boundary plasticity; Columnar grain; Nanotwinned metals; Molecular dynamics simulations
Citation Formats
Sansoz, Frederic, and Fang, Qiongjiali. Columnar Grain-driven Plasticity and Cracking in Nanotwinned FCC Metals. United States: N. p., 2021.
Web. doi:10.1016/j.actamat.2021.116925.
Sansoz, Frederic, & Fang, Qiongjiali. Columnar Grain-driven Plasticity and Cracking in Nanotwinned FCC Metals. United States. https://doi.org/10.1016/j.actamat.2021.116925
Sansoz, Frederic, and Fang, Qiongjiali. Sat .
"Columnar Grain-driven Plasticity and Cracking in Nanotwinned FCC Metals". United States. https://doi.org/10.1016/j.actamat.2021.116925. https://www.osti.gov/servlets/purl/1778962.
@article{osti_1778962,
title = {Columnar Grain-driven Plasticity and Cracking in Nanotwinned FCC Metals},
author = {Sansoz, Frederic and Fang, Qiongjiali},
abstractNote = {The mechanisms of strengthening and plasticity in columnar-grained metals with preferentially oriented nano-sized twins have been examined traditionally by considering dislocation processes, but rarely from the perspective of grain boundary (GB) deformation. Here, the effects of GB strain accommodation on plastic deformation in four different columnar-grained nanocrystalline nanotwinned (nt) face-centered-cubic metals (Cu, Ag, Al, and Ni) were studied by large-scale molecular dynamics simulations. It is observed that in tensile deformation parallel to coherent twin boundaries (CTBs), the dislocation mechanisms in each metal are identical and associated with GB emissions of jog and threading dislocations at small and large CTB spacings, respectively. However, CTB strengthening effects are increasingly more pronounced in columnar-grained nt metals as their shear modulus increases, which is rationalized by the dependence of GB stress concentrations on twin size, metal type and strain rate. Also, while flow stresses in nt-Cu, nt-Ag, and nt-Al metals increase linearly with decreasing CTB spacing, a maximum strength limit is reached in nt-Ni below a critical CTB spacing of 6 nm. The strength limit in nt-Ni results from columnar GB cracking induced by prominent GB sliding. For columnar-grained microstructures, GB sliding is equivalent in nt-Ag and nt-Al and slightly lower in nt-Cu but markedly higher in nt-Ni. These findings underscore the importance of new GB deformation mechanisms on plasticity and fracture in columnar-grained nt metals and enrich our understanding of CTB strengthening in fcc metals synthesized in the literature.},
doi = {10.1016/j.actamat.2021.116925},
journal = {Acta Materialia},
number = ,
volume = 212,
place = {United States},
year = {Sat Apr 24 00:00:00 EDT 2021},
month = {Sat Apr 24 00:00:00 EDT 2021}
}
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