氢对镁中裂纹扩展的影响
PDF下载 (97)刘 琳,谢 超.氢对镁中裂纹扩展的影响[J].宁波大学学报(理工版),2024,37(5):116-120.DOI:10.20098/j.cnki.1001-5132.2024.0309
LIU Lin,XIE Chao.Effect of hydrogen on crack propagation in magnesium[J].Journal of Ningbo University(Natural Science & Engineering Edition),2024,37(5):116-120.DOI:10.20098/j.cnki.1001-5132.2024.0309
| Title: | Effect of hydrogen on crack propagation in magnesium |
| 作者: | 刘 琳, 谢 超 |
| Author(s): | LIU Lin, XIE Chao |
| 关键词: | 分子动力学; Mg-H系统; 脆韧结合; 裂纹; 位错 |
| Keywords: | molecular dynamics; Mg-H system; brittle-ductile mixed fracture; crack; dislocations |
| 分类号: | O343.1 |
| DOI: | 10.20098/j.cnki.1001-5132.2024.0309 |
| 文献标识码: | A |
| 摘要: | 构建Mg-H原子体系, 通过分子动力学仿真研究了单轴拉伸载荷作用下氢原子分布对单晶镁的断裂模式以及裂纹传播路径的影响. 结果表明: 纯镁体系中, 由于裂纹尖端位错的发射, 裂尖前沿呈现孔洞化特征; 氢原子随机分布体系中, 氢原子会抑制裂纹尖端的位错发射, 裂尖积累能量通过晶面解理方式予以释放; 氢原子偏析体系中, 极限应力随氢原子偏析区域体积增大而降低, 断裂应变随氢原子偏析区域体积减小而增大, 裂纹扩展路径为解理裂纹与孔洞的连接. 证明了氢偏析可导致镁晶体中出现脆韧结合的断裂模式, 并导致镁晶体的延迟断裂. |
| Abstract: | This study builds an Mg-H atomic system and investigates the influence of hydrogen atom distribution on the fracture mode and crack propagation path of single-crystal magnesium under uniaxial tensile loading using molecular dynamic simulation. The results indicate that in the pure magnesium system, due to dislocation emission at the crack tip, the crack tip exhibits the characteristic of cavitations. In the randomly hydrogen-distributed system, hydrogen atoms inhibit dislocation emission at the crack tip, and the accumulated energy at the crack tip is released through the cleavage along crystal planes. In the system with hydrogen segregation, the ultimate stress decreases with increasing volume of hydrogen segregation region, while the fracture strain increases with decreasing volume of hydrogen segregation region, and the crack propagation path involves the coalescence of cleavage cracks and cavities. The study demonstrates that hydrogen segregation can lead to a brittle-ductile mixed fracture mode in magnesium crystals, causing the delayed fracture of magnesium crystals. |
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| 备注/Memo: | 收稿日期: 2024−03−13. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（12272192）. 第一作者: 刘琳, 硕士研究生, 主要研究方向: 镁合金氢脆的原子研究. E-mail: 2111081149@nbu.edu.cn *通信作者: 谢超, 博士/教授, 主要研究方向: 合金多尺度多物理场材料力学. E-mail: xiechao@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
