The evolutions of the microstructure and properties of 6061 aluminum alloy irradiated by the pulsed electron beam generated by pseudo-spark discharge is the main focus of this paper. The pseudo-spark discharge is a low-pressure, transient discharge which has been recognized as a high efficient electron beam source with the rapid current growth of ~1012A/s, high power density of ~109W/cm2, short-duration pulse of 102~103nsand self-focusing beam diameter of0.5~6mm. These characteristics enable the material treated by the pseudo-spark pulsed electron beam to melt and cool rapidly, and form the fine grain structure. In this work, the evolutions of the micromorphology and surface properties of 6061 aluminum alloy and the influences of the beam parameters are investigated and analysed. The corrosion resistance of the surface is investigated by the electrochemical corrosion experiments. The mechanism of the “crater” in the surface microstructure formed by the pseudo-spark pulsed electron beam under varying beam accelerating voltages is also analysed and discussed. The experimental results in this paper demonstrate that the re-melting layer of the material surface appears after the given pseudo-spark pulsed electron beam irradiations, and "large crater" morphology forms under higher voltage. The homogenization of the element distributions on the surface and reduction of the impurity on the re-melting layer after given pulsed electron beam treatments are capable of improving the mechanical properties of the alloy workpiece surface, and the corrosion resistance of the surface is also increased after given pulsed electron beam treatments.
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机译：微结构的演变和由伪火花放电所产生的脉冲电子束照射6061铝合金的性质是本文的主要关注点。伪火花放电是一种低压力，瞬时放电，已被确认为用〜1012A /秒，〜109W / cm 2时，102短持续时间脉冲的高功率密度的急剧的电流增长高效率的电子束源〜103nsand自聚焦光束直径of0.5〜6毫米。这些特性使得能够通过伪火花脉冲电子束处理，以熔化和快速冷却，并形成细晶粒结构的材料。在这项工作中，6061铝合金的微观形态和表面性质和梁参数的影响的演变进行了研究和分析。表面的耐腐蚀性是通过电化学腐蚀实验研究。在由伪火花形成的表面微观结构的“火山口”的机制的脉冲变的束加速电压下的电子束也进行了分析和讨论。在本文的实验结果表明，该材料表面的重新熔化层在给定伪火花脉冲电子束照射后出现，以及更高的电压下的“火山口大”形态学形式。表面与给定脉冲电子束处理后减少再熔融层上的杂质的在元件分布的均匀化是能够提高合金工件表面的机械性能，和表面的耐腐蚀性也被增加后给定的脉冲电子束处理。
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