| Mechanical properties of self-irradiated single-crystal copper |
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| 作者姓名： | 李维娜 薛建明 王建祥 段慧玲 |
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| 基金项目： | Project supported by the National Basic Research Program of China(Grant No.2011CB013101);the National Natural Science Foundation of China(GrantNos.11172001,91226202,and 11225208) |
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| 摘 要： | Molecular dynamics simulations are performed to investigate the influence of irradiation damage on the mechanical properties of copper. In the simulation, the energy of primary knocked-on atoms （PKAs） ranges from 1 to 10 keV, and the results indicate that the number of point defects （vacancies and interstitials） increases linearly with the PKA energy. We choose three kinds of simulation samples： un-irradiated and irradiated samples, and comparison samples. The un-irradiated samples are defect-free, while irradiation induces vacancies and interstitials in the irradiated samples. It is found that due to the presence of the irradiation-induced defects, the compressive Young modulus of the single-crystal Cu increases, while the tensile Young modulus decreases, and that both the tensile and compressive yield stresses experience a dramatic decrease. To analyze the effects of vacancies and interstitials independently, the mechanical properties of the comparison samples, which only contain randomly distributed vacancies, are investigated. The results indicate that the vacancies are responsible for the change of Young modulus, while the interstitials determine the yield strain.
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| 关 键 词： | 机械性能 铜单晶 照射 压缩屈服应力 辐照损伤 杨氏模量 模拟分析 分子动力学 |
Mechanical properties of self-irradiated single-crystal copper |
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| Abstract: | Molecular dynamics simulations are performed to investigate the influence of irradiation damage on the mechanical properties of copper. In the simulation, the energy of primary knocked-on atoms(PKAs) ranges from 1 to 10 keV, and the results indicate that the number of point defects(vacancies and interstitials) increases linearly with the PKA energy. We choose three kinds of simulation samples: un-irradiated and irradiated samples, and comparison samples. The un-irradiated samples are defect-free, while irradiation induces vacancies and interstitials in the irradiated samples. It is found that due to the presence of the irradiation-induced defects, the compressive Young modulus of the single-crystal Cu increases, while the tensile Young modulus decreases, and that both the tensile and compressive yield stresses experience a dramatic decrease.To analyze the effects of vacancies and interstitials independently, the mechanical properties of the comparison samples,which only contain randomly distributed vacancies, are investigated. The results indicate that the vacancies are responsible for the change of Young modulus, while the interstitials determine the yield strain. |
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| Keywords: | irradiation damage single crystal mechanical property molecular dynamics simulation |
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