强流脉冲电子束对铝基复合材料的改性研究

Study on Modifi cation of Aluminum Matrix Composites by High Current Pulsed Electron Beam

本文研究了强流脉冲电子束(HCPEB)处理的Al-SiC复合材料表面微观形貌及其性能,并提出了相应的机理。SEM结果显示:随着电子束脉冲次数增加,在表层形成了重熔层,材料表面的气孔被填充。XRD结果显示:电子束处理后,Al-SiC复合材料表面没有新相生成,此外在电子束处理后,Al-衍射峰发生了明显的偏移现象,说明电子束处理后材料表面存在一定应力导致晶格发生畸变,从而引起Al-衍射峰向高角度方向移动;显微硬度结果显示:电子束处理后,复合材料的表面维氏显微硬度得到提高,随脉冲次数的增加,硬度呈现出明显增加后趋向稳定趋势;摩擦系数结果表明:电子束处理后,随着脉冲次数的增加,复合材料表面的耐磨系数及磨损量都降低,复合材料的表面耐磨性得到显著提高。

The surface morphology and properties of Al-SiC composites treated by high current pulsed electron beam(HCPEB)were studied,and the corresponding mechanism was proposed.SEM results show that with the increase of electron beam pulse times,a remelting layer is formed on the surface,and the pores on the material surface are filled.XRD results show that after electron beam treatment,no new phase is formed on the surface of Al-SiC composites.In addition,after electron beam treatment,the Al-diffraction peak is obviously offset,indicating that there is a certain stress on the surface of the material after electron beam treatment,resulting in lattice distortion,resulting in the movement of Al-diffraction peak to high angle direction;The microhardness results show that the Vickers microhardness of the composite surface is improved after electron beam treatment.With the increase of pulse times,the hardness increases obviously at first and then tends to be stable;The results of friction coefficient show that after electron beam treatment,with the increase of pulse times,the wear coefficient and wear amount of the composite surface are reduced,and the surface wear resistance of the composite is significantly improved.