自然科学版
陕西师范大学学报(自然科学版)
专题研究
金属Ta中刃型位错弛豫结构和能量的原子级模拟
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解丽娟,张建民
(陕西师范大学 物理学与信息技术学院, 陕西 西安 710062)
解丽娟,女,硕士研究生,主要从事凝聚态物理研究.
摘要:
采用改进分析型嵌入原子法(Modified Analytical Embedded Atom Method,MAEAM),结合分子动力学(Molecular Dynamics, MD)模拟方法,从原子尺度对金属Ta中的a[100]刃型位错弛豫结构和能量进行了计算机模拟.结果表明,弛豫后的平衡结构具有C2v型群对称性;当径向距离R≥1.5b=4.953 9×10-8 cm时,单位长度位错线应变能Es与ln(R/2b)成线性关系,由此确定的位错芯区半径rc=4.953 9×10-8 cm,由线性拟合的截距确定的畸变能Ecore=1574 5×108 eV/cm.
关键词:
刃型位错; Ta; 改进分析型嵌入原子法
收稿日期:
2005-10-12
中图分类号:
O483
文献标识码:
A
文章编号:
1672-4291(2006)03-0037-04
基金项目:
国家重点基础研究发展计划资助项目(973)(2004CB619302);国家自然科学基金资助项目(50271038)
Doi:
Atomistic simulation of the relaxed structure and energy of edge dislocation in metal Ta
XIE Li-juan, ZHANG Jian-min
(Collage of Physics and Information Technology, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
Combined the modified analytical embedded atom method (MAEAM) with molecular dynamics (MD) simulation method, both the relaxed structure and strain energy of an a[100] edge dislocation in metal Ta have been simulated on atomic scales. The results show that the relaxed structure has a C2v type group symmetry. The calculated strain energy Es per unit length of the dislocation line is a linear function of ln(R/2b) while radial distance R≥1.5b=4.953 9×10-8 cm, thus the corresponding core radius is determined to be rc=4.953 9×10-8 cm, the dislocation core energy Ecore=1.574 5×108 eV/cm can be obtained with the intercept from a linear fit.
KeyWords:
edge dislocation; Ta; modified analytical embedded atom method