SiCp/Al复合材料的Fe11+离子辐照实验研究

为了解辐照对航天电子元器件封装基板复合材料SiC_p/Al的影响，利用3 MeV Fe11+束流进行了不同注量下的辐照实验。辐照完成后，利用X射线衍射（XRD）仪和纳米压痕仪对材料进行表征分析。XRD分析表明，Fe11+离子入射后材料辐照层应力发生了变化。结合对应的理论模型，对铝基体的位错密度进行计算，发现辐照后铝基体的位错密度增加，SiC颗粒产生非晶化。纳米压痕测试表明，随着离子注量增加，材料辐照硬化程度增加。综上，辐照硬化可能是由于铝合金基体的应力变化导致产生局部高密度位错区，而这些区域阻碍了后续位错的运动，进而导致位错聚集，最终使得材料硬度增加。

Experimental study on SiCp/Al composites under irradiation of Fe11+ ions

To understand the effect of irradiation on SiC_p/Al composites for aerospace electronic components packing substrates, 3 MeV Fe11+ beam was used to carry out irradiation experiments under different ion fluence. After irradiation, X-ray diffraction (XRD) and nano-indentation were used to characterize and analyze the materials. XRD analysis indicated that the stress of irradiated layer changed after Fe11+ ions’ incidence. Combined with the corresponding theoretical model, the dislocation density of aluminum matrix was calculated. It was found that the dislocation density of aluminum matrix increased, and the SiC particles were amorphized after irradiation. The measurement of nano-indentation revealed that the irradiation hardening of the material increased with the increase of ion fluence. It can be deduced that the irradiation hardening may be due to the stress changes in aluminum alloy matrix leading to the generation of local high-density dislocation regions, which impedes the subsequent dislocation movements, and ultimately increases the hardness of the material.