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

Mengying Liu, Matteo Seita, Ta Duong, Winson C. H. Kuo, and Michael J. Demkowicz
Phys. Rev. Materials 3, 063606 – Published 17 June 2019

Abstract

We describe an investigation of microstructure in pure nickel (Ni) after cathodic charging in an 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. Our observations show that, far from being always corrosion resistant, CTBs are especially susceptible to intergranular corrosion under some conditions.

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  • Received 20 December 2018

DOI:https://doi.org/10.1103/PhysRevMaterials.3.063606

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Mengying Liu1,*, Matteo Seita2, Ta Duong1, Winson C. H. Kuo3, and Michael J. Demkowicz1

  • 1Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843-3003, USA
  • 2School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
  • 3Materials Characterization Facility, Texas A&M University, College Station, Texas 77843-3471, USA

  • *Corresponding author: myliu@tamu.edu

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Vol. 3, Iss. 6 — June 2019

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