强流脉冲电子束应力诱发的微观结构

利用强流脉冲电子束装置在各种工艺条件下对奥氏体不锈钢、单晶铝及多晶铝等面心立方金属进行辐照处理.利用扫描电子显微镜和透射电子显微镜等详细分析了辐照样品的变形组织与结构.通过分析，在一定程度上建立起强流脉冲电子束诱发的应力特征与变形结构之间的关系，并对目前现有的几种应力波数值模拟结果进行了分析.实验结果表明，强流脉冲电子束能够在材料内部诱发10²—10³MPa的应力，其传播方式与材料的 晶体结构关系密切.这一应力是导致材料深层性能与微观组织结构发生变化的根源所在. 关键词： 强流脉冲电子束 应力 微观结构 变形

Microstructure induced by stress generated by high-current pulsed electron beam

Face-center cubic metal materials including austenite stainless steel, aluminum single crystal and multi-grained pure aluminum were irradiated by a high-current pulsed electron beam (HCPEB) source in different processes. The deformed microstructures were observed by using scanning electron microscopy and transmiss ion electron microscopy. The relationship between stress characteristic and the microstructures has been analyzed. The current numerical simulations of the ther mal-mechanical process of HCPEB treatment were also investigated by comparing w ith the present experimental results. The present experimental results suggest t hat the value of the stress induced by HCPEB lies between 10²—10³MPa. The behavior of the stress propagation is closely related to the crystal structure of the material. This stress leads to the modification of the properties and the microstructures of the irradiated material in regions of greater depth.