Microstructure and property modifications in surface layers of a Mg-4Sm-2Al-0.5Mn alloy induced by pulsed electron beam treatments  

作　　者：Yingrui Liu Kemin Zhang Jianxin Zou Ping Yan Xu Zhang Luxia Song 

机构地区：[1]School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620,China [2]National Engineering Research Center of Light Alloys Net Forming&School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Magnesium and Alloys》2021年第1期216-224,共9页镁合金学报（英文）

基　　金：This work was supported by the National Natural Science Foundations of China(No.51271121,51471109).

摘　　要：In this work,surface modification of a Mg-4Sm-2Al-0.5Mn alloy with high current pulse electron beam(HCPEB)under different number of pulses were investigated.The evolution in microstructure,composition and phase components and properties in the surface layer before and after HCPEB treatment were characterized.It was found that the Al 11 Sm 3 and Al 2 Sm phases in the surface layer were gradually dissolved during HCPEB treatment,leading to the formation of a chemical homogeneous melted layers.Besides,deformation bands were formed in the treated layer due to the thermal stress generated during treatment.After 15 pulses treatment,the surface hardness increases to the maximum value of about 62.2 HV,about 61.2%higher than that of the untreated state.Electrochemical results show that the 15 pulses treated sample presents the best corrosion resistance in the 3.5wt%NaCl water solution by showing the highest corrosion potential(E_(corr))of-1.339V SEC and the lowest corrosion current density(I_(corr))of 1.48×10^(-6)A·cm^(-2).The results prove that the surface properties of the Mg-4Sm-2Al-0.5Mn alloy can be significantly improved by the HCPEB treatments under proper conditions.

关 键 词：High current pulsed electron beam(HCPEB) Surface modification Mg rare earth alloy MICROSTRUCTURES CORROSION-RESISTANCE 

分 类 号：TG174.4[金属学及工艺—金属表面处理]