首页|分子动力学方法评估氢浓度对α-Fe塑性变形的影响

分子动力学方法评估氢浓度对α-Fe塑性变形的影响

扫码查看
通过分子动力学模拟研究循环加载下氢浓度对多晶α-Fe内部塑性变形的影响.运用Ovito软件观察氢与位错、空位及晶界的相互作用.采用Wigner-Seitz单元法计算模型中的空位数.结果表明,随着氢浓度的增加,在α-Fe中,位错的产生和发射在{110}<111>滑移体系中会增强,而在其他滑移系中会受到抑制.存在一个临界氢浓度,低于该浓度时氢原子会促进塑性变形,高于该浓度塑性变形受抑制.空位数量和应力强度随着氢浓度和循环次数的增加而增加,且空位数量受循环载荷的影响小于受氢浓度的影响.该模拟方法确定了影响α-Fe塑性变形的临界氢浓度,并分析了氢浓度对位错滑移系及空位的影响,为研究氢导致的材料内部微观缺陷提供参考.
Hydrogen Concentration Effect on the Plastic Deformation of α-Fe by Molecular Dynamics Simulation
The effect of hydrogen concentration on plastic deformation inside polycrystalline α-Fe under cycle loading is investigated by molecular dynamics(MD)simulations.Ovito is applied to observe the interaction of hydrogen with dislocations,grain boundaries,and vacancies.The number of vacancies in the model is calculated by the Wigner-Seitz cell method.The results prove that dislocation generation,and emission are enhanced in the { 110}<111>slip system and suppressed in the other slip systems by atomic hydrogen concentration.There is a critical hydrogen concentration below which hydrogen atoms promote plastic deformation,beyond which the plastic deformation is hindered.The number of vacancies and the stress intensity increase with hydrogen concentration and the number of loading cycles.Moreover,the generation of vacancies is less affected by cycle loading than by the hydrogen concentration.It reveals the critical hydrogen concentration that affects the plastic deformation of α-Fe and the effect of hydrogen concentration on the dislocation slip systems and vacancies,which provides insight into the study of hydrogen-induced microscopic defects in metals.

hydrogen concentrationdislocationcyclic loadingmolecular dynamic modeling

邢潇、李凤英

展开 >

中国石油大学(华东)储运与建筑工程学院,山东青岛 266580

氢浓度 位错 循环加载 分子动力学

国家自然科学基金中国石油科技创新基金山东省研究生精品专业学位教学案例库建设项目中国石油大学(华东)教学研究与改革项目

523740722022DQ02-0502SDJAL2023006CM2022042

2024

实验室研究与探索
上海交通大学

实验室研究与探索

CSTPCD北大核心
影响因子:1.69
ISSN:1006-7167
年,卷(期):2024.43(5)
  • 24