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

CHAI LinJiang 已出版文章查询
CHAI LinJiang
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1 ZHOU ZhiMing 已出版文章查询
ZHOU ZhiMing
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zhouzhiming@cqut.edu.cn
1 * XIAO ZhiPei 已出版文章查询
XIAO ZhiPei
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1 TU Jian 已出版文章查询
TU Jian
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1 WANG YaPing 已出版文章查询
WANG YaPing
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2 HUANG WeiJiu 已出版文章查询
HUANG WeiJiu
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1College of Materials Science and Engineering Chongqing University of Technology Chongqing 400054 China

2School of Science Xi'an Jiaotong University Xi'an 710049 China


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A Cu-50Cr alloy was treated by the high current pulsed electron beam (HCPEB) at 20 and 30 keV 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.

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DOI: http://dx.doi.org/10.1007/s11431-015-5774-7

语种: 英文   

基金This study was supported by the National Natural Science F...

关键词Cu-Cr alloy microstructure surface modification electron beam


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