Evolution of surface microstructure of Cu-50Cr alloy treated by high current pulsed electron beam  

作　　者：CHAI LinJiang ZHOU ZhiMing XIAO ZhiPei TU Jian WANG YaPing HUANG WeiJiu 

机构地区：[1]College of Materials Science and Engineering, Chongqing University of Technology [2]School of Science, Xi'an Jiaotong University

出　　处：《Science China(Technological Sciences)》2015年第3期462-469,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51101177,51401040,51171146 and 51171216);the Natural Science Foundation of Chongqing(Grant No.CSTC2012JJA245)

摘　　要：A Cu-50Cr alloy was treated by the high current pulsed electron beam(HCPEB)at 20 and 30 ke V with pulse numbers ranging from 1 to 100.Surface morphologies and microstructures of specimens before and after the treatments were investigated by employing scanning electron microscopy and X-ray diffraction.Results show that the HCPEB technique is able to induce remarkable surface modifications for the Cu-50Cr alloy.Cracks in Cr phases appear even after one-pulse treatment and their density always increases with the pulse number.Formation reason for these cracks is attributed to quasi-static thermal stresses accumulated along the specimen surface.Craters with typical morphologies are formed due to the dynamic thermal field induced by the HCPEB and they are found to prefer the sites near cracks or boundaries between neighboring Cr phases.Another microstructural characteristic produced by the HCPEB is the fine Cr spheroids,which are determined to be due to occurrence of liquid phase separation in the Cu-50Cr alloy.Finally,a general microstructural evolution profile that incorporates various HCPEB-induced surface features is tentatively outlined.

关 键 词：Cu-Cr alloy MICROSTRUCTURE surface modification electron beam 

分 类 号：TG178[金属学及工艺—金属表面处理]