Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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A hardening model considering grain size effect for ion-irradiated polycrystals under nanoindentation

  • Liu, Kai (State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University) ;
  • Long, Xiangyun (State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University) ;
  • Li, Bochuan (State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University) ;
  • Xiao, Xiazi (Department of Mechanics, School of Civil Engineering, Central South University) ;
  • Jiang, Chao (State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University)
  • Received : 2020.08.18
  • Accepted : 2021.03.07
  • Published : 2021.09.25
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Abstract

In this work, a new hardening model is proposed for the depth-dependent hardness of ion-irradiated polycrystals with obvious grain size effect. Dominant hardening mechanisms are addressed in the model, including the contribution of dislocations, irradiation-induced defects and grain boundaries. Two versions of the hardening model are compared, including the linear and square superposition models. A succinct parameter calibration method is modified to parametrize the models based on experimentally obtained hardness vs. indentation depth curves. It is noticed that both models can well characterize the experimental data of unirradiated polycrystals; whereas, the square superposition model performs better for ion-irradiated materials, therefore, the square superposition model is recommended. In addition, the new model separates the grain size effect from the dislocation hardening contribution, which makes the physical meaning of fitted parameters more rational when compared with existing hardness analysis models.

Keywords

Acknowledgement

This work was supported by the National Science Fund for Distinguished Young Scholars, China (Grant No. 51725502), the Foundation for Innovative Research Groups of the National Natural Science Foundation of China (Grant No. 51621004), the National Nature Science foundation of China (NSFC) under Contract No, 11802344, and Natural Science Foundation of Hunan Province, China (Grant No. 2019JJ50809).

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