金属学报  2020, Vol. 56 Issue (5): 753-759    DOI: 10.11900/0412.1961.2019.00324
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1.中国科学院上海应用物理研究所 上海 201800
2.中国科学院大学核科学与技术学院 北京 100049
3.上海科技大学物质科学与技术学院 上海 201210
Numerical Simulation of Nanohardness in Hastelloy N Alloy After Xenon Ion Irradiation
LIU Jizhao1,2,3, HUANG Hefei1,2(), ZHU Zhenbo1,2, LIU Awen1,2,3, LI Yan1,2,3()
1.Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2.School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
3.School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
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Abstract

Ion irradiation experiments are of importance for investigating irradiation damage of reactor structural materials. However, estimating the irradiation hardening of ion-irradiated materials is difficult due to the limitation of ion penetration depth. In recent years, nanoindentation test has been widely used to study the irradiation hardening of materials, because the continuous stiffness measurement (CSM) mode can obtain the relationship between nanohardness and indentation depth at a very small penetration depth. In this work, the average nanohardness of Hastelloy N alloy irradiated by xenon ion at room temperature was tested by this mode. The results showed that the nanohardness in the irradiated samples was larger than that in the unirradiated sample and this value of irradiated samples is saturated when the irradiation dose is in the range of 0.5~3.0 dpa. Based on the Nix-Gao model, the indentation size effects (ISE) of unirradiated and irradiated samples were separated from nanohardness measured by nanoindentation. The volume law of mixture model (VLM) was subsequently applied to simulate the measured nanohardness. As the depth of indentation increases, the plasticity affected region (PAR) includes both irradiation damage layer and matrix. Interface parameter was introduced to correct the volume of matrix deformation. The results indicated that the improved VLM model leads to a characteristic relation for the depth dependence of nanohardness that is in excellent agreement with nanoindentation experiments.

Key wordsirradiation hardening    nanoindentation    volume law of mixture (VLM) model    numerical simulation

 ZTFLH: TL341

Corresponding author: HUANG Hefei,LI Yan     E-mail: huanghefei@sinap.ac.cn;liyan@sinap.ac.cn

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#### 引用本文:

Jizhao LIU, Hefei HUANG, Zhenbo ZHU, Awen LIU, Yan LI. Numerical Simulation of Nanohardness in Hastelloy N Alloy After Xenon Ion Irradiation. Acta Metall Sin, 2020, 56(5): 753-759.

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