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Title: Preferential corrosion of coherent twin boundaries in pure nickel under cathodic charging

Abstract

We describe an investigation of microstructure in pure nickel (Ni) after cathodic charging in aqueous electrolyte. Intergranular corrosion occurs on the sample surface and takes the form of long trenches along coherent twin boundaries (CTBs): sites that have often been considered especially resistant to corrosion. Integrating electron backscatter diffraction and x-ray computed tomography, we show that the trenches are formed by the growth and eventual overlap of isolated conical cavities, which, in turn, are aligned with < 110 >-type directions within CTB planes. The < 110 >-type orientation is consistent with cavity initiation at high-energy, symmetric incoherent twin boundary facets within CTB planes. Lastly, our observations show that, far from being always corrosion resistant, CTBs are especially susceptible to intergranular corrosion under some conditions.

Authors:
 [1];  [2];  [1];  [1];  [1]
  1. Texas A & M Univ., College Station, TX (United States)
  2. Nanyang Technological Univ. (Singapore)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1527019
Grant/Contract Number:  
SC0008926
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 6; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Liu, Mengying, Seita, Matteo, Duong, Ta, Kuo, Winson C. H., and Demkowicz, Michael J. Preferential corrosion of coherent twin boundaries in pure nickel under cathodic charging. United States: N. p., 2019. Web. doi:10.1103/PhysRevMaterials.3.063606.
Liu, Mengying, Seita, Matteo, Duong, Ta, Kuo, Winson C. H., & Demkowicz, Michael J. Preferential corrosion of coherent twin boundaries in pure nickel under cathodic charging. United States. doi:10.1103/PhysRevMaterials.3.063606.
Liu, Mengying, Seita, Matteo, Duong, Ta, Kuo, Winson C. H., and Demkowicz, Michael J. Mon . "Preferential corrosion of coherent twin boundaries in pure nickel under cathodic charging". United States. doi:10.1103/PhysRevMaterials.3.063606.
@article{osti_1527019,
title = {Preferential corrosion of coherent twin boundaries in pure nickel under cathodic charging},
author = {Liu, Mengying and Seita, Matteo and Duong, Ta and Kuo, Winson C. H. and Demkowicz, Michael J.},
abstractNote = {We describe an investigation of microstructure in pure nickel (Ni) after cathodic charging in aqueous electrolyte. Intergranular corrosion occurs on the sample surface and takes the form of long trenches along coherent twin boundaries (CTBs): sites that have often been considered especially resistant to corrosion. Integrating electron backscatter diffraction and x-ray computed tomography, we show that the trenches are formed by the growth and eventual overlap of isolated conical cavities, which, in turn, are aligned with < 110 >-type directions within CTB planes. The < 110 >-type orientation is consistent with cavity initiation at high-energy, symmetric incoherent twin boundary facets within CTB planes. Lastly, our observations show that, far from being always corrosion resistant, CTBs are especially susceptible to intergranular corrosion under some conditions.},
doi = {10.1103/PhysRevMaterials.3.063606},
journal = {Physical Review Materials},
number = 6,
volume = 3,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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This content will become publicly available on June 17, 2020
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