中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 12 No. 3 June 2002 |
Zn-Ag peritectic alloys
（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
