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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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Effects of extrusion on chromium precipitation 
in Cu-Cr alloy
FAN Zhi-kang(范志康), YANG Hong-wang(杨红旺), 
LIANG Shu-hua(梁淑华), XIAO Peng(肖 鹏)

School of Materials Science and Engineering,
Xi′an University of Technology, Xi′an 710048, China

Abstract:Cu-Cr alloys containing Cr from 0.14% to 2.0% in mass were prepared as foils for TEM observation before and after being extruded. The results show that before extrusion, the spheroid or short bar chromium disperse in copper matrix of the Cu-Cr alloy, and the relationship between Cu and Cr follows the Nishiyama-Wasserman (NW) relationship, i.e. [110]Cu∥[001]Cr. After the Cu-Cr alloy was extruded at 860℃, dark field image along (224)Cu clearly shows that there are precipitated chromium particles in copper matrix. However, the SADP comprises only (112)Cu zone. 

 

Key words:  Cu-Cr alloy; chromium precipitation; extrusion

ISSN 1672-7029
CN 43-1423/U

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