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Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy

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Abstract

A nanostructured surface layer was formed on an Inconel 600 plate by subjecting it to surface mechanical attrition treatment at room temperature. Transmission electron microscopy and high-resolution transmission electron microscopy of the treated surface layer were carried out to reveal the underlying grain refinement mechanism. Experimental observations showed that the strain-induced nanocrystallization in the current sample occurred via formation of mechanical microtwins and subsequent interaction of the microtwins with dislocations in the surface layer. The development of high-density dislocation arrays inside the twin-matrix lamellae provides precursors for grain boundaries that subdivide the nanometer-thick lamellae into equiaxed, nanometer-sized grains with random orientations.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 110016, Shenyang, China

    N. R. Tao, M. L. Sui & K. Lu

  2. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanism, Chinese Academy of Sciences, 100080, Beijing, China

    X. L. Wu

  3. LASMIS, University of Technology of Troyes, 10000, Troyes, France

    J. Lu

Authors
  1. N. R. Tao
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  2. X. L. Wu
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  3. M. L. Sui
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  4. J. Lu
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  5. K. Lu
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Corresponding author

Correspondence to K. Lu.

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Tao, N.R., Wu, X.L., Sui, M.L. et al. Grain refinement at the nanoscale via mechanical twinning and dislocation interaction in a nickel-based alloy. Journal of Materials Research 19, 1623–1629 (2004). https://doi.org/10.1557/JMR.2004.0227

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  • DOI: https://doi.org/10.1557/JMR.2004.0227

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