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Dissociation of Tilt Dislocation Walls in Au

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The movement or dissociation of dislocations is significantly important for better understanding the plastic deformation mechanisms and mechanical properties of metals. It is commonly believed that a dislocation < 110 > /2 in Au is easy to dissociate into a pair of Shockley partial dislocations < 112 > /6 due to low stacking fault energy (SFE). Contrary to this prevailing perception, the present atomistic modeling demonstrates that this reaction could be completely suppressed when dislocations < 110 > /2 are grouped into tilt walls, consistent with our experimental observations. Such phenomenon is actually the extreme case accompanying with the variation of Burgers vectors of partials with tilt angle, as revealed by a series of simulations, from which it is clearly seen that the Burgers vectors of partials deviate considerably from that of Shockley partials, enormously depending on the tilt angle. Our findings could facilitate a better understanding on many phenomena and properties of face-centered cubic metals (FCC).

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 52071316, 51771206 and 51571198) and K.C. Wong Education Foundation (No. GJTD-2020-09).

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Authors and Affiliations

  1. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Yu-Juan Geng, Jing-Xin Yan, Zhen-Jun Zhang, Hua-Jie Yang, Jin-Bo Yang & Zhe-Feng Zhang

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Yu-Juan Geng, Jin-Bo Yang & Zhe-Feng Zhang

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

    Chun-Yang Wang & Kui Du

  4. School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing, 400074, China

    Jing-Xin Yan

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  1. Yu-Juan Geng
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Correspondence to Jin-Bo Yang, Kui Du or Zhe-Feng Zhang.

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The authors declare that we have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Available online at http://link.springer.com/journal/40195.

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Geng, YJ., Wang, CY., Yan, JX. et al. Dissociation of Tilt Dislocation Walls in Au. Acta Metall. Sin. (Engl. Lett.) 35, 1787–1792 (2022). https://doi.org/10.1007/s40195-022-01409-3

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  • DOI: https://doi.org/10.1007/s40195-022-01409-3

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