利用强流脉冲电子束进行AZ91铸造镁合金表面辐照改性,处理参数包括加速电压27 k V,脉冲次数1到30次。使用金相显微镜、扫描和透射电子显微镜观察样品表层形貌和显微组织。研究表明,原始铸造组织的粗大树枝晶α-Mg和颗粒相β-Mg17Al12发生熔解,表面成分均匀化,并形成细小的复合纳米网状结构。改性AZ91镁合金的表面显微硬度和耐磨损性能得到显著提高,8次脉冲处理样品的表面显微硬度由原始62.7 HK提高到119.4 HK,磨损速率由0.01126降至0.00173mm3/min。
High current pulsed electron beam (HCPEB) has been developed as a useful tool for surface treatment of materials.In the present work,the fundamental principle of HCPEB source was described along with the device configuration and working parameters.Through the different kinds of HCPEB surface treatment experiments conducted,the enhanced surface properties induced by HPCEB treatment were illustrated and explained with their microstructure characterization results.
Hao Shengzhi1,2,Wang Huihui1,2,Li Mincai1,3,Xu Yang1,3,Dong Chuang1,3 1Key Laboratory of Materials Modification by Laser,Ion and Electron Beams,Ministry of Education,Dalian University of Technology,Dalian 116024,China2School of Physics and Optoelectronics Engineering,Dalian University of Technology,Dalian 116024,China3School of Material Science and Engineering,Dalian University of Technology,Dalian 116024,China
