铁和钨中晶界对材料辐照损伤影响的理论模拟
发布时间：2018-09-08 08:07
【摘要】：利用稳态下的化学速率理论并结合晶界效应,对纳米晶材料的抗辐照能力进行研究,发现纳米晶材料的抗辐照能力只与体内空位自身的扩散速率有关,而与吸收偏压(指空位扩散速率与间隙原子扩散速率之比)无关.纳米晶铁和钨都表现出相比多晶优良的性能.采用分子动力学模拟晶界对铁和钨体内间隙原子和空位的吸收能力,研究纳米晶材料在非平衡态下的辐照损伤行为.结果表明,铁中晶界对空位具有很好的俘获能力.对于面向等离子体材料钨,体内中的空位滞留较大,主要是受到了吸收偏压的影响.在未来聚变装置中典型的服役环境下,到达稳态之前,吸收偏压的大小对纳米晶材料的抗辐照能力起决定作用.
[Abstract]:Based on the chemical rate theory under steady state and the grain boundary effect, the anti-irradiation ability of nanocrystalline materials is studied. It is found that the anti-irradiation ability of nanocrystalline materials is only related to the diffusion rate of vacancies in the body. But it has nothing to do with the absorption bias (the ratio of vacancy diffusion rate to gap atom diffusion rate). Both nanocrystalline iron and tungsten exhibit better properties than polycrystals. The radiation damage behavior of nanocrystalline materials in nonequilibrium state was studied by using molecular dynamics to simulate the absorption of interstitial atoms and vacancies in iron and tungsten. The results show that the grain boundary in iron has a good trapping capacity for vacancies. For plasma-oriented tungsten, the vacancy in the body is large, which is mainly affected by the absorption bias. In the typical service environment of future fusion devices, the magnitude of the absorption bias plays a decisive role in the radiation resistance of nanocrystalline materials before reaching the steady state.
【作者单位】： 安徽大学物理与材料科学学院;中国科学院固体物理研究所材料物理重点实验室;
【基金】：国家自然科学基金资助项目(11534012,11475215,11605231)~~
【分类号】：TB383.1
本文编号：2229908
[Abstract]:Based on the chemical rate theory under steady state and the grain boundary effect, the anti-irradiation ability of nanocrystalline materials is studied. It is found that the anti-irradiation ability of nanocrystalline materials is only related to the diffusion rate of vacancies in the body. But it has nothing to do with the absorption bias (the ratio of vacancy diffusion rate to gap atom diffusion rate). Both nanocrystalline iron and tungsten exhibit better properties than polycrystals. The radiation damage behavior of nanocrystalline materials in nonequilibrium state was studied by using molecular dynamics to simulate the absorption of interstitial atoms and vacancies in iron and tungsten. The results show that the grain boundary in iron has a good trapping capacity for vacancies. For plasma-oriented tungsten, the vacancy in the body is large, which is mainly affected by the absorption bias. In the typical service environment of future fusion devices, the magnitude of the absorption bias plays a decisive role in the radiation resistance of nanocrystalline materials before reaching the steady state.
【作者单位】： 安徽大学物理与材料科学学院;中国科学院固体物理研究所材料物理重点实验室;
【基金】：国家自然科学基金资助项目(11534012,11475215,11605231)~~
【分类号】：TB383.1
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