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

Journal Article · · Physical Review Materials
 [1];  [2];  [3];  [3];  [3]
  1. Texas A & M Univ., College Station, TX (United States); Texas A&M University
  2. Nanyang Technological Univ. (Singapore)
  3. Texas A & M Univ., College Station, TX (United States)

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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
SC0008926
OSTI ID:
1527019
Alternate ID(s):
OSTI ID: 1546248; OSTI ID: 1688810
Journal Information:
Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 3; ISSN PRMHAR; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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