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Effect of small strain levels on special boundary distribution in commercially pure nickel

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Abstract

Commercially pure nickel has been processed via low-strain and high-strain routes using various thermomechanical cycles with isochronal annealing from 500 to 900 °C. Electron backscattered diffraction was used to characterize the percentage of special boundaries (Σ3–29) formed. Measurements also included twin variants based on Σ3n. Of the various single-strain and multiple-strain temperature combinations that were processed, both routes showed that a single low strain of about 2 to 6% followed by annealing at 900 °C for 10 min resulted in a doubling of the special fraction of grain boundaries. In addition, the Σ3n variants were also approximately doubled without the recourse to multiple processing and/or multiple heat treatments. It was proposed, based on theories from the literature, that extrinsic grain boundary dislocations formed at low strain levels in a mantle-core formation and, on annealing, climbed along the boundary and formed special grain boundary types.

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Authors and Affiliations

  1. NRC Institute for Aerospace Research (NRC-IAR), Campus Université de Montréal, 5145 Decelles Ave., H4T 1W5, Montréal, Quebec, Canada

    B. Guyot

  2. Department of Mechanical & Manufacturing Engineering, University of Manitoba, R3T 5V6, Winnipeg, MB, Canada

    S. -L. Lee & N. L. Richards

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  1. B. Guyot
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  2. S. -L. Lee
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  3. N. L. Richards
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Guyot, B., Lee, S.L. & Richards, N.L. Effect of small strain levels on special boundary distribution in commercially pure nickel. J. of Materi Eng and Perform 14, 85–90 (2005). https://doi.org/10.1361/10599490522356

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  • DOI: https://doi.org/10.1361/10599490522356

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