冲击加载下纯钛微观塑性变形的分子动力学模拟

陈亚洲; 周留成; 何卫锋; 罗思海; 焦阳; 庞澄清; 刘鹏

doi:doi:10.3788/cjl201643.0802014

中国激光, 2016, 43 (8): 0802014, 网络出版: 2016-08-10

冲击加载下纯钛微观塑性变形的分子动力学模拟下载： 1066次

Molecular Dynamics Simulation of Plastic Deformation of Pure Titanium Under Shock Loading

论文大纲

陈亚洲 ^1,*周留成 ¹何卫锋 ¹罗思海 ¹焦阳 ¹庞澄清 ²刘鹏 ²

作者单位

¹ 空军工程大学等离子体重点实验室, 陕西西安 710038

² 中国人民解放军94106部队, 陕西西安 710038

激光光学塑性变形分子动力学冲击纯钛 laser optics plastic deformation molecular dynamics shock pure titanium

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摘要

激光冲击强化利用激光冲击波力学效应可提高金属材料力学性能，现有实验手段难以测量波后动态物理参量、局部动态力学量以及微观组织动态运动过程。采用分子动力学方法，在300 K初始温度下对纯钛进行冲击模拟，观察到冲击加载下冲击波在纯钛中传播的动态双波结构，得到了加载过程中的力学量动态变化以及力学作用下孪晶的动态生长过程。塑性变形过程中，由于位错的塞积和释放，正应力上升的同时剪切力和流变应力不断下降，形成平行孪晶栅。在受冲击表面观察到了极薄的非晶层，其形成与超高应变率塑性变形和动态再结晶相关，且孪晶和非晶层结构均与透射电子显微镜结果吻合较好。

Abstract

Laser shock peening utilizes the mechanical effect of shockwave to improve the mechanical properties of metal materials, however, it is very difficult to measure the dynamic physical parameters after shockwave, the local dynamic mechanical parameters, and the development of microstructure with current means of experiment. The molecular dynamics method is employed to conduct the shock simulation in pure titanium at a starting temperature of 300 K , the dynamic dual-wave structure feature of the shockwave in pure titanium under the shock loading is observed, and the change of the mechanical parameters as well as the dynamic growing process of twin phase under shock loading are obtained. During the plastic deformation, the stoppage and release of dislocation make the normal stress rise while the shear stress and von Mises stress continue to drop, and the parallel twin gratings are formed. A layer of amorphous structure is observed on the surface subject to shock loading, and its formation is related to ultrahigh strain rate plastic deformation and dynamic recrystallization behavior. Both the twin structure and the amorphous structure coincide with the results obtained by transmission electron microscopy.

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陈亚洲, 周留成, 何卫锋, 罗思海, 焦阳, 庞澄清, 刘鹏. 冲击加载下纯钛微观塑性变形的分子动力学模拟[J]. 中国激光, 2016, 43(8): 0802014. Chen Yazhou, Zhou Liucheng, He Weifeng, Luo Sihai, Jiao Yang, Pang Chengqing, Liu Peng. Molecular Dynamics Simulation of Plastic Deformation of Pure Titanium Under Shock Loading[J]. Chinese Journal of Lasers, 2016, 43(8): 0802014.

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