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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Laser resolidification of Zn-rich
Zn-Ag peritectic alloys
ZHANG Guo-dong(张国栋)1, LI Zhi-yuan(李志远)1,
XU Wei(许  伟)2,LI Yi(李  毅)2

1. School of Materials Science and Engineering, 
Huazhong University of Science and Technology, Wuhan 430074, China;
2. Department of Materials Science,
National University of Singapore, Singapore 119260

Abstract:Laser remelting experiments were performed by a 1.0kW continuous CO2 laser to investigate the rapid solidification behavior of Zn-rich Zn-Ag peritectic alloys. Three kinds of microstructures occurrs with the varying of laser scanning speed and Ag content in the alloys. It is mainly plate-like single-phase cellular η when the Ag content was lower than 1.8% (mole fraction). As the Ag content increased, instead of typical structure of primary dendrites o f ε surrounded by peritectic η, a two-phase plate-like η+ε with primary dendrites of ε is found when the laser scanning speed was higher than a critical value. Intercellular spacing of cellular η or interphases pacing of two-phase couple growth η+ε decreases with increasing laser scanning speed.

 

Key words: Zn-Ag alloys; laser remelting; peritectic; couple growth

ISSN 1672-7029
CN 43-1423/U

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