High Current Pulsed Electron Beam Treatment of Hypereutectic Al-17.5Si Alloy

摘要：

Effect of high current pulsed electron beam (HCPEB) on microstructure and properties of hypereutectic Al-17.5Si alloy is investigated in this paper. Modification mechanism is analyzed by SEM and XRD. SEM results show that Si element diffuses into Al matrix and forms single phase of a solid solution on Al-17.5Si surface after 35 pulses. XRD analysis presents that no new phase forms after HCPEB treatment, and lattice parameters of Al decrease significantly after 15 pulses. Properties test results show that the surface microhardness of primary Si phase presents gradient distribution from center to edge of Al-Si-diffused-zone, and the microhardness of center of primary Si decreases gradually with an 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 properties of hypereutectic Al-Si alloys.

关键词： High current pulsed electron beam (HCPEB) Hypereutectic Al-17.5Si alloy Microstructure Microhardness Wear resistance

作者: B.Gao Y.Hao G.F.Tu W.X.Shi S.W.Li S.Z.Hao C.Dong

作者单位: School of materials and metallurgy,Northeastern University,Shenyang 110004,China State Key Laboratory of Materials Modification by Laser,Ion and Electron Beams,Dalian University of

会议类型: 国际会议

会议名称: The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)

会议地点: 北京

会议语种:英文

页码: 596-599

在线出版日期: 2009-10-27（万方平台首次上网日期，不代表论文的发表时间）