ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 18    Special 1    December 2008

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Investigation of flux containing GdCl3 on recycling Mg-Gd-Y-Zr scraps
WANG Wei(王 玮)1, 2, WU Guo-hua(吴国华)1, 2, WANG Qu-dong(王渠东)1, 2, HUANG Yu-guang(黄玉光)1, 2, SUN Ming(孙 明)1, 2, DING Wen-jiang(丁文江)1, 2
(1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China;2. State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China)
Abstract: The effects of GdCl3 in flux on the loss of Gd, microstructure, mechanical properties, and corrosion resistance of Mg-Gd-Y-Zr(GW103K) scrapswere investigated by ICP, XRD, SEM and EDS. The results show that the loss of Gd in the alloy decreases with increasing GdCl3 content in the flux, and the mechanism of GdCl3 suppressing the loss of Gd was analyzed by thermodynamic theory. The optimal average mechanical properties could be obtained when the GdCl3 content in the flux was 5% (mass fraction). Compared with the alloy only treated by JDMJ flux, the σb and σs of GW103K alloy were improved from 160.91 MPa and 133.88 MPa to 224.96 MPa and 157.91 MPa by 39.8% and 17.95%, respectively. Immersion test shows the corrosion rate of Mg-Gd-Y-Zr alloy refined by JDMJ+5.0% GdCl3 flux was decreased dramatically from 0.762 mg/(cm2.d) to 0.437 mg/(cm2.d) by 42.7%. GdCl3 has no effect on the fracture pattern of GW103K alloy.
Key words: magnesium alloy; gadolinium; mechanical properties; refining, thermodynamics
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU) 湘ICP备09001153号-9