Investigation of flux containing GdCl_3 on recycling Mg-Gd-Y-Zr scraps  

作　　者：王玮 吴国华 王渠东 黄玉光 孙明 丁文江 

机构地区：[1]National Engineering Research Center of Light Alloy Net Forming,Shanghai Jiao Tong University [2]State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University

出　　处：《中国有色金属学会会刊：英文版》2008年第A01期292-298,共7页Transactions of Nonferrous Metals Society of China

基　　金：Project(2007CB613701)supported by the National Basic Research Program of China;Project(2006BAE04B07-2)supported by theNational Key Technology R&D Program of China;Project(08XD14020)supported by the Program of Shanghai Subject Chief Scientist

摘　　要：The effects of GdCl_3 in flux on the loss of Gd,microstructure,mechanical properties,and corrosion resistance of Mg-Gd-Y-Zr(GW103K) scraps were investigated by ICE XRD,SEM and EDS.The results show that the loss of Gd in the alloy decreases with increasing GdCl_3 content in the flux,and the mechanism of GdCl_3 suppressing the loss of Gd was analyzed by thermodynamic theory.The optimal average mechanical properties could be obtained when the GdCl_3 content in the flux was 5% (mass fraction).Compared with the alloy only treated by JDMJ flux,theσ_b andσ_s 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/(cm^2·d) to 0.437 mg/(cm^2·d)by 42.7%.GdCl_3 has no effect on the fracture pattern of GW103K alloy.The effects of GdCl3 in flux on the loss of Gd, microstructure, mechanical properties, and corrosion resistance of Mg-Gd-Y-Zr（GW103K） scraps were 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/（cm^2.d） to 0.437 mg/（cm^2.d）by 42.7%. GdCl3 has no effect on the fracture pattern of GW103K alloy.

关 键 词：镁合金 GdCl3 MG-GD-Y-ZR合金 预处理 

分 类 号：TG146.22[一般工业技术—材料科学与工程]