北京航空航天大学学报 ›› 2000, Vol. 26 ›› Issue (5): 497-500.

• 论文 •    下一篇

纳秒脉冲电子束冲击强化金属表面的研究

韩丽君1, 阿舍尔2, 江兴流2, 康文3   

  1. 1. 北京航空航天大学 材料科学与工程系;
    2. 北京航空航天大学 理学院;
    3. 中国科学院 高能物理所
  • 收稿日期:1999-05-12 出版日期:2000-05-31 发布日期:2010-09-27
  • 作者简介:韩丽君(1945-),女,吉林长春人,副教授,100083,北京.
  • 基金资助:

    航空基础科学基金资助项目(97H51117)

Surface Modification of Metals Irradiated by Intense Nanosecond Pulsed Electron Beam

HAN Li-jun1, A She-er2, JIANG Xing-liu2, KANG Wen3   

  1. 1. Beijing University of Aeronautics and Astronautics, Dept. of Materials Science and Engineering;
    2. Beijing University of Aeronautics and Astronautics,School of Science;
    3. Institute of High Energy Physics
  • Received:1999-05-12 Online:2000-05-31 Published:2010-09-27

摘要: 讨论了纳秒强脉冲电子束(功率密度为109W/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.纳秒强脉冲电子束注入是金属材料表面改性的新手段.

Abstract: Under irradiation of intense-nanosecond-electron beam with power density of 109?W/cm2,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.

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