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Molecular dynamics study of the γ/γʹ interface influencing the nano-deformation of nickel-based single crystal alloys during nanoindentation process

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Abstract

To investigate the effect of γ/γʹ interface on the nano-deformation of the workpiece during nanoindentation of nickel-based single crystal alloys, a two-phase model of γ phase doped with Cr and Co elements was simulated using a molecular dynamics approach with controlling the indenter displacement. It is found that: in the early stage of loading, the load increases gradually with the increase of loading depth; when the indenter is close to the interface, the load is affected by the interface and changes abruptly, generating a great value; after the indenter breaks through the interface, the load fluctuates and becomes larger. More Stair-rod dislocations and Hirth dislocations are generated at the interface, and these dislocations, together with some dislocation nodes, strengthen the matrix dislocations to enhance the deformation resistance of the workpiece. In addition, atomic displacement, strain transfer, and defect development are discontinuous during the movement of the γ phase to the γʹ phase. In particular, the displaced atom morphology in the γʹ phase evolves from triangular to filleted corner, reflecting the inhibitory effect of the boundary on the development of the plastic deformation region.

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The data that support the findings of this study are available from the corresponding author, upon reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 52265025), the Open Project of State Key Laboratory of Solid Lubrication (LSL-2215), and the Gansu Provincial Natural Science Foundation (23JRRA811).

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Lanzhou University of Technology, Lanzhou, 730050, China

    Zongxiao Zhu, Hongmiao Zhang, Yingpeng Xu, Dingfeng Qu, Xingchun Wei & Min Zheng

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  1. Zongxiao Zhu
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  2. Hongmiao Zhang
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Contributions

ZZ: Writing–original draft, Formal analysis. HZ: Data curation, Visualization. YX: Investigation, Conceptualization. DQ: Validation, Supervision. XW: Methodology, Resources, Supervision. MZ: Investigation, Formal analysis.

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Correspondence to Min Zheng.

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We declare that our paper has not been submitted or published elsewhere; All data in this paper are true and reliable, and the main data and charts have not been published; This article does not contain plagiarism or infringement of others' intellectual property rights; This study does not involve human or animals.

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Zhu, Z., Zhang, H., Xu, Y. et al. Molecular dynamics study of the γ/γʹ interface influencing the nano-deformation of nickel-based single crystal alloys during nanoindentation process. Appl. Phys. A 130, 111 (2024). https://doi.org/10.1007/s00339-024-07281-5

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