In situ backscattered electron imaging study of the effect of annealing on the deformation behaviors of Ni electroformed from additive-free and saccharin-containing sulfamate solutions

Kai Jiang, Hiroaki Nakano, Satoshi Oue, Tatsuya Morikawa, Wen huai Tian

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The Ni samples were electroformed from additive-free (AF) and saccharin-containing (SC) sulfamate solutions, respectively. In situ backscattered electron (BSE) imaging, electron backscatter diffraction (EBSD), and electron-probe microanalysis (EPMA) were used to investigate the effect of annealing on the deformation behaviors of the AF and SC samples. The results indicate that columnar grains of the as-deposited AF sample had an approximated average width of 3 μm and an approximated aspect ratio of 8. The average width of columnar grains of the as-deposited SC sample was reduced to approximately 400 nm by the addition of saccharin to the electrolyte. A few very-large grains distributed in the matrix of the SC sample after annealing. No direct evidence indicated that S segregated at the grain boundaries before or after annealing. The average value of the total elongations of the SC samples decreased from 16% to 6% after annealing, whereas that of the AF samples increased from 18% to 50%. The dislocation recovery in grain-boundary areas of the annealed AF sample was reduced, which contributed to the appearance of microvoids at the triple junctions. The incompatibility deformation between very-large grains and fine grains contributed to the brittle fracture behavior of the annealed SC Ni.

    Original languageEnglish
    Pages (from-to)114-123
    Number of pages10
    JournalInternational Journal of Minerals, Metallurgy and Materials
    Volume26
    Issue number1
    DOIs
    Publication statusPublished - Jan 1 2019

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Geochemistry and Petrology
    • Metals and Alloys
    • Materials Chemistry

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