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Title: Shear banding mechanism in compressed nanocrystalline ceramic nanopillars

Abstract

Localization of deformation in shear bands is widely observed preceding intense damage and fracture in ductile or granular materials. However, mechanisms about how shear bands form are generally not known. Here, we show that nanocrystalline ceramic (NCC) nanopillars of ZrN fracture by shear banding under compression. The microstructure evolution of entire shear banding process was in situ monitored by electron imaging and diffraction. Results show that the nanopillars deform through a series of granular activities due to intermittent nucleation and propagation of dislocations. The stress drops associated with the dislocation activities are relatively small since dislocation avalanches are restricted in NCCs because of the effect of nanograin size. Localized and cooperative granular activities, as well as nanocracks, are discovered in the regions where shear bands form. A model about shear band and nanocrack formation is proposed. These findings thus demonstrate for the first time of spatial and temporal nature of intermittent granular activities, leading to shear band formation in NCCs.

Authors:
 [1];  [1];  [1]; ORCiD logo [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States)
Publication Date:
Research Org.:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1609367
Alternate Identifier(s):
OSTI ID: 1562766
Grant/Contract Number:  
FG02-01ER45923; DEFG02-01ER45923
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 8; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Shear deformation; Nanostructures; Electron diffraction; High-resolution transmission electron microscopy; Indentation

Citation Formats

Hsiao, Haw-Wen, Li, Shu, Dahmen, Karin A., and Zuo, Jian-Min. Shear banding mechanism in compressed nanocrystalline ceramic nanopillars. United States: N. p., 2019. Web. https://doi.org/10.1103/physrevmaterials.3.083601.
Hsiao, Haw-Wen, Li, Shu, Dahmen, Karin A., & Zuo, Jian-Min. Shear banding mechanism in compressed nanocrystalline ceramic nanopillars. United States. https://doi.org/10.1103/physrevmaterials.3.083601
Hsiao, Haw-Wen, Li, Shu, Dahmen, Karin A., and Zuo, Jian-Min. Fri . "Shear banding mechanism in compressed nanocrystalline ceramic nanopillars". United States. https://doi.org/10.1103/physrevmaterials.3.083601. https://www.osti.gov/servlets/purl/1609367.
@article{osti_1609367,
title = {Shear banding mechanism in compressed nanocrystalline ceramic nanopillars},
author = {Hsiao, Haw-Wen and Li, Shu and Dahmen, Karin A. and Zuo, Jian-Min},
abstractNote = {Localization of deformation in shear bands is widely observed preceding intense damage and fracture in ductile or granular materials. However, mechanisms about how shear bands form are generally not known. Here, we show that nanocrystalline ceramic (NCC) nanopillars of ZrN fracture by shear banding under compression. The microstructure evolution of entire shear banding process was in situ monitored by electron imaging and diffraction. Results show that the nanopillars deform through a series of granular activities due to intermittent nucleation and propagation of dislocations. The stress drops associated with the dislocation activities are relatively small since dislocation avalanches are restricted in NCCs because of the effect of nanograin size. Localized and cooperative granular activities, as well as nanocracks, are discovered in the regions where shear bands form. A model about shear band and nanocrack formation is proposed. These findings thus demonstrate for the first time of spatial and temporal nature of intermittent granular activities, leading to shear band formation in NCCs.},
doi = {10.1103/physrevmaterials.3.083601},
journal = {Physical Review Materials},
number = 8,
volume = 3,
place = {United States},
year = {2019},
month = {8}
}

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