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Size effect of deformation nanotwin bundles on their strengthening and toughening in heterogeneous nanostructured Cu

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Abstract

Herein, we fabricated a heterogeneous nanostructured Cu with deformation nanotwin bundles (NTBs) embedded in a matrix of nanograins by means of dynamic plastic deformation at liquid nitrogen temperature. We conducted fracture mechanical measurements to investigate the effect of longitudinal length of the NTBs on their strengthening and toughening. Results suggest that an increase in the NTB length had a marginal influence on the tensile strength; however, it remarkably promoted both fracture initiation toughness and crack growth toughness. Longer NTBs are more effective not only in intrinsically enhancing crack tip plasticity by suppressing the strain localization and void nucleation but also in serving as crack bridges behind the crack front to extrinsically resist the fracture by shielding the crack tip.

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Authors and Affiliations

  1. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, 210094, China

    Zesheng You

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

    Shusen Luo & Lei Lu

Authors
  1. Zesheng You
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  2. Shusen Luo
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  3. Lei Lu
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Corresponding author

Correspondence to Zesheng You.

Additional information

You Ze-Sheng was supported by the National Key R&D Program of China (Grant No. 2017YFA0204403). Lu Lei acknowledges financial support from the National Natural Science Foundation of China (Grant Nos. U1608257 and 51931010), the Key Research Program of Frontier Science and the International Partnership Program (Grant No. GJHZ2029), Chinese Academy of Sciences, and Liaoning Revitalization Talents Program (Grant No. XLYC1802026).

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You, Z., Luo, S. & Lu, L. Size effect of deformation nanotwin bundles on their strengthening and toughening in heterogeneous nanostructured Cu. Sci. China Technol. Sci. 64, 23–31 (2021). https://doi.org/10.1007/s11431-020-1584-6

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  • DOI: https://doi.org/10.1007/s11431-020-1584-6

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