【作者】 秦颖； 董丽； 郝胜智； 董闯；

【Author】 Qin Ying,Dong Li,Hao Sheng-Zhi,Dong Chuang Key Laboratory of Materials Modification by Laser,Ion and Electron Beams(Dalian University of Technology), Ministry of Education,Dalian 116024,China)

【机构】 大连理工大学三束材料改性教育部重点实验室物理学院；

【摘要】 本文在强流脉冲电子束材料表面改性实验和数值模拟的基础上,对电子束轰击引起的热力耦合进行分析,进一步证实了亚表层率先升温及熔化从而通过表层向外喷发的熔坑形成机制。在强流脉冲电子束轰击下,金属表层一定范围内会产生显著的硬化效果,改性层深度远远超出了热影响区的范围,达到数百微米的深度,这是冲击热应力波载荷作用下的深层改性机制。更多还原

【Abstract】 Based on experimental and numerical simulations of the surface modifacation produced by bombardments of a high-current pulsed electron beam,the present paper aims at analying the coupled thermo-mechanical mechanism of surface modifacation.We attributed that the deep modification effect was caused by an intense stress wave originated from sublayer transmittance of an intense radial stress as high as a few GPa.Thanks to the large amplitude stress wave exerted intense impacts over a long distance.The shock stress wave however is a typical nonlinear wave,and has a strong impact on materials structure and properties far beyond the heat-affected zone,which caused irregular oscillations of the depth profiles of the hardness.更多还原