摘要
讨论了纳秒强脉冲电子束 (功率密度为 1 0 9W/cm2 )辐射金属表面后产生的强化作用 .纳秒脉冲电子束瞬间在材料表面局部区域注入巨大能量 ,使金属表面微区瞬间产生高温高压和冲击作用 ,并产生骤热急冷过程 ,使材料表面硬度、耐腐蚀性和其他物化性能发生明显变化 .文中讨论了脉冲电子束导致快速熔凝的热传导过程 ,并分析了从扫描电镜照片观察到的金属急冷过程的显微结构 .
Under irradiation of intense nanosecond electron beam with power density of 10 9?W/cm 2,tensnanosecond duration,the metal surfaces with enhancement of hardness, corrosion resistance and other physico\|chemical behavior improvement have been obtained due to the microstructure changing. Thermal transfer processes of rapid melting and solidification have been analyzed. The micrographies of SEM(Scanning Electron Microscopy) show the variety of morphologies due to rapid cooling of treated areas. In the gas environment of 10?Pa, the effect of magnetic self pinch leads to high power density of pseudospark electron beams due to charge neutralization. It is expected for wide application of material surface modification for such pulsed electron beams. Much more studies should be done for further understanding of the interaction of beam\|target.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2000年第5期497-500,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
航空基础科学基金资助项目! ( 97H5 1117)
关键词
脉冲
电子束
显微结构
快速凝固
pulse
electron beams
microstructure
rapid solidification
