嵌入原子法计算金属钚中点缺陷的能量

敖冰云; 汪小琳; 陈丕恒; 史鹏; 胡望宇; 杨剑瑜

doi:10.7498/aps.59.4818

摘要

钚因放射性衰变而出现老化效应.钚中点缺陷的性质和行为是理解钚老化效应的一个基础和前提.运用分子动力学模拟技术,计算了金属钚中点缺陷和点缺陷团簇的形成能和结合能.其中钚-钚、钚-氦和氦-氦相互作用势分别采用嵌入原子多体势、Morse对势和Lennard-Jones对势.计算结果表明,单个自间隙原子易以〈100〉哑铃状形态存在;间隙氦原子在理想晶格的八面体间隙位置相对较为稳定;氦原子与空位的结合能较大,在钚的自辐照过程中两者易于结合并形成氦-空位团簇;氦-空位团簇的形成能随氦原子数的增加而增大,当氦与空位的数

关键词:

钚 /
点缺陷 /
嵌入原子法 /
辐照损伤

Abstract

Plutonium is vulnerable to aging due to α radioactive decay. The properties and behaviors of point defects in plutonium are the basis for understanding plutonium aging. We have employed a molecular dynamics technique to calculate the formation energy and binding energy of point defects and small helium-vacancy clusters in plutonium, using embedded atom method, Morse pair potential and the Lennard-Jones pair potential for describing the interactions of Pu-Pu, Pu-He and He-He, respectively. A single self-interstitial atom’s steady configuration is 〈100〉 dumb-bell. An interstitial helium atom at octahedral site is more stable than that at tetrahedral site. As a result of high binding energy of an interstitial helium atom to a vacancy, helium atoms can combine with vacancies to form helium-vacancy cluster during the process of self-radiation. The formation energy of helium-vacancy cluster increases with the increasing number of helium atoms. When the number of helium atoms equals to the number of vacancy, the helium-vacancy cluster is rather stable. Both substitutional and interstitial helium atoms are trapped at the grain boundary (GB). The binding energy of the self-interstitial atom at GB core is higher than that of helium atom and vacancy.

Keywords:

PACS:

作者及机构信息

(1)表面物理与化学国家重点实验室,绵阳 621907; (2)湖南大学应用物理系,长沙 410082

基金项目: 国家自然科学基金(批准号:20801007)资助的课题.

Authors and contacts

(1)Department of Applied Physics, Hunan University, Changsha 410082, China; (2)National Key Laboratory for Surface Physics and Chemistry, Mianyang 621907, China

参考文献

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[16]	Ao B Y, Wang X L, Hu W Y, Yang J Y, Xia J X 2007 J. Alloys Comp. 444-445 300
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[20]	Baskes M I, Vitek V 1985 Metall. Trans. A 16 1625
[21]	Suzuki A, Mishin Y 2003 Interface Sci. 11 425
[22]	Robinson M T 1994 J. Nucl. Mater. 216 1

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