Surface modification of magnesium alloy AZ91 by high current pulsed electron beam (HCPEB) was investigated in the present work. After irradiated by HCPEB, crater-like defects were found scattering on the modified surface, when increasing pulse number, the density of craters sharply reduced. According to XRD analysis, hard intermetallic phase Mg17Al12 would sappear after several pulse of HCPEB treatment that is accordance with the improvement of wear resistance, but more pulses will lead to the solution of Mg17Al12 phase. Ultimately, due to the thickest depth of modified layer, sample treated with 30 pulses and accelerating voltage of 27 kV exhibited the best wear resistance, the depth of wear track decreased from 12.75 µm in initial state to 7.82 μm.
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机译：本文研究了大电流脉冲电子束（HCPEB）对镁合金AZ91的表面改性。经HCPEB照射后，发现坑状缺陷散布在改性表面上，当增加脉冲数时，坑状密度急剧降低。根据X射线衍射分析，经过多次HCPEB处理后，会产生硬质金属间相Mg 17 Al 12 ，这与耐磨性的提高是一致的，但更多的脉冲会导致Mg 17 Al 12 相的溶液。最终，由于改性层的最厚深度，经过30个脉冲和27 kV的加速电压处理的样品表现出最佳的耐磨性，磨损痕迹的深度从初始状态的12.75 µm降低到7.82 µm。
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