研究了强流脉冲电子束表面改性处理对过共晶铝硅合金(Al-17.5Si)组织和性能的影响.利用扫描电镜和X射线衍射分析了改性机理.扫描电镜结果表明,在电子束处理后的合金表面上,硅元素扩散到铝基体中形成单相α固溶体.X射线衍射分析指出,电子束处理后合金表面没有新的物相生成,并在15脉冲处理后铝的晶格参数显着降低.硬度结果表明,在铝硅扩散区域,初生硅的硬度从中心向边缘呈现梯度分布趋势,而且初生硅中心处的硬度随脉冲次数的增加逐渐减小.耐磨性随脉冲次数的增加先提高后降低,磨损量在15次脉冲后降低了84.6%.因此该技术在改善过共晶铝硅合金表面耐磨性方面展现了良好的应用前景.
Effect of high current pulsed electron beam (HCPEB) on microstructure and properties of hypereutectic Al-17.5Si alloy was investigated.Modification mechanism was analyzed by SEM and XRD.SEM results show that Si element diffuses into Al matrix and forms single phase of α solid solution on top surface of HCPEB-treated Al-17.5Si alloy.XRD analysis results show that no new phase forms after HCPEB treatment,and lattice parameters of Al significantly decrease after 15-pulse treatment.Hardness test results show that microhardness of primary Si phase presents gradient distribution from the center to edge of Al-Si-diffused-zone,and the microhardness of center of primary Si decreases gradually with increase of pulse number.Wear resistance increases first and then decreases with increase of pulses,and the wear weight loss declines by 84.6% after 15 pulses.The HCPEB technique is thus demonstrated to have a good application future in improving surface wear resistance of hypereutectic Al-Si alloys.
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