Numerical Investigations of Helical Dislocations in Hydrogenated Aluminum Micropillar

• 作 者: LIU Feng-Xian LIU Zhan-Li ZHUANG Zhuo
• 机 构: Applied Mechanics Laboratory, School of Aerospace Engineering,Tsinghua University ,Beijing 100084,Ch
• 出 处: 第十四届全国物理力学学术会议
• 发表日期: 2016年8期
• 关键词: helical dislocation micro pillar hydrogen dislocation climb vacancy concentratio

　　Helical dislocations are observed during the compression of a hydrogenated pure aluminum pillar at room temperature.It is absolutely an unusual dislocation behavior at such a low temper-ature,but thanks to the superabundant vacancy concentration introduced along with hydrogen charging.In this study,a coupled glide-climb model is proposed based on three-dimensional dis-crete dislocation dynamics (3D-DDD) to reveal the intrinsic formation mechanism of such helical dislocation and to figure out the influence factors.First,a dislocation climb model is developed,which is controlled by the diffusion of the supersaturated vacancies causing by the H-trapping effect.