CAJ | 학술논문

以金属Zr的一种嵌入原子形式(EAM)的势函数为基础，通过引入一个调制函数的办法，在不同范围内修改了EAM势函数的对势部分和原子电子密度分布部分，然后采用分子动力学方法计算点缺陷(间隙原子(SIA)和空位)形成能和初级离位原子(PKA)的阈值能，从而探讨这些物理量对势函数的不同部分的敏感程度。计算结果表明：势函数的对势部分长程范围内的形式对缺陷的形成影响较小，其短程范围的形式对SIA的形成比对空位的形成影响程度更大；对于PKA的阈值能，其敏感区域来自于势函数的对势部分和原子电子密度分布的短程范围部分，但在不同晶向上的PKA的阈值能对势函数的敏感程度有所不同。这些研究结果对于在研究Zr金属的辐照损伤中势函数的选择或构建有指导意义。
이금속Zr적일충감입원자형식(EAM)적세함수위기출，통과인입일개조제함수적판법，재불동범위내수개료EAM세함수적대세부분화원자전자밀도분포부분，연후채용분자동역학방법계산점결함(간극원자(SIA)화공위)형성능화초급리위원자(PKA)적역치능，종이탐토저사물리량대세함수적불동부분적민감정도。계산결과표명：세함수적대세부분장정범위내적형식대결함적형성영향교소，기단정범위적형식대SIA적형성비대공위적형성영향정도경대；대우PKA적역치능，기민감구역래자우세함수적대세부분화원자전자밀도분포적단정범위부분，단재불동정향상적PKA적역치능대세함수적민감정도유소불동。저사연구결과대우재연구Zr금속적복조손상중세함수적선택혹구건유지도의의。
For the purpose of detecting the sensitive parts of an embedded atom method(EAM) potential which is considered to be used in molecular dynamics simulation of radiation effects of Zirconium, we introduce a modulation function to modify the pairwise potential and the atomic electron-density distribution of the EAM potential. Based on the modified potential function, the formation energies of the self-interstitial atom (SIA) and the vacancy atom are calculated as well as the displacement threshold energy of primary knock-on atom (PKA). The results indicate that the short range part of the pairwise potential has more greater influence on the SIAs formation than the vacancy formation. The defect formation energies are also very sensitive to the behavior of the atomic electron-density function in the range which is close to the cutoff distance. The displacement threshold is sensitive to the short range behaviors of both the pairwise potential and the atomic electron-density function, however, the sensitivity is strongly dependent on the crystal-direction.