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Li Y.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Yang J.,Harbin Welding Institute | Ye H.,Nanjing University of Aeronautics and Astronautics | And 3 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2012

Effects of rare earth element Pr additions on the microstructure and properties of Sn-Zn-Ga solder were studied in this paper. The wettability of solder was significantly improved by 0.08%Pr addition. However, the wettability of solder would deteriorate when the Pr addition exceeds 0.12% due to the oxidization of Pr element at the liquid surface. Moreover, the mechanical property of solder joint was improved by Pr addition and the maximum shear strength was obtained when 0.08% Pr was added. The Zn-rich phase in the solder matrix was refined by Pr but the thickness of interface layer showed no obvious difference when Pr was less than 0.08%. When excessive Pr was added, the interface layer thickness of the joint increased significantly, so that the optimal content of Pr in the Sn9Zn0.5Ga solder is about 0.08%. Source


Hu Y.,Nanjing University of Aeronautics and Astronautics | Xue S.,Nanjing University of Aeronautics and Astronautics | Yang J.,Harbin Welding Institute | Ye H.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2012

The interface morphology and mechanical property of Sn-9Zn-0.06Nd/Cu soldered joints after aging treatment at 150°C were investigated with scanning electronic microscope (SEM) and STR-1000 joint strength tester. The experimental results indicated that a planar Cu 5Zn 8 intermetallic layer (IMC) formed in the soldered joint interface, whose thickness increased with increasing aging time, and the rare earth element Nd migrated towards the interface and reacted with Sn forming Nd 3Sn near the interface. While increasing the aging time, the tensile stress of the Sn-9Zn-0.06Nd/Cu micro-joints decreased, and it even reduced by 50% after aging for 720 h. The fracture mode of the soldered joints turned from ductile fracture before aging treatment to both ductile and brittle fracture after aging for 720 h. Source


Lai Z.,Nanjing University of Aeronautics and Astronautics | Lai Z.,Jiangsu University of Science and Technology | Xue S.,Nanjing University of Aeronautics and Astronautics | Han X.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2010

Ga, Sn, In and Ni were added into AgCuZn cadmium-free brazing alloys. The influences of Ga, Sn, In and Ni on the microstructures and properties of AgCuZn brazing alloys were investigated. Mechanical properties of the butt and lap brazed joints were also tested. Results indicate that all AgCuZn-X(Ga, Sn, In, Ni) brazing alloys have low solidus and liquidus and acceptable mechanical properties. It is pointed out that the mechanical properties of the brazed joints are satisfactory due to the formation of fine network "characteristic gallium structure" when Ag and Ga contents are in a range of 30 wt%-56 wt% and 1 wt%-3 wt%, respectively, in the AgCuZn brazing alloy. Copyright © 2010, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved. Source


Lai Z.,Nanjing University of Aeronautics and Astronautics | Lai Z.,Jiangsu University of Science and Technology | Xue S.,Nanjing University of Aeronautics and Astronautics | Zhang L.,Nanjing University of Aeronautics and Astronautics | And 3 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2010

The effect of Ga and/or In on the microstructures of Ag based filler metals for brazing as well as the properties of the brazed joints have been investigated in this paper. Brazed with brass as the base metal (butt joints), the results showed that, the optimum content of Ga and In in Ag-Cu-Zn-Sn-xGa-yIn filler metal was about 3% and 1.5% respectively, and the mechanical property of the Ag-Cu-Zn-Sn-3Ga-2In filler metal displayed the best value when the Ga and In were added into the filler metal simultaneously. When observing the tensile fracture of the butt joint brazed with Ag-Cu-Zn-Sn-3Ga-2In, it was found that the ductile fracture characteristics, when the content of In exceeded 2%, the dissociation morphology fracture would be emerged which had little influence on the tensile property of the brazed joints. The elements of Ga and In distributed uniformly, no segregation in the microstructure of the Ag-Cu-Zn-Sn-3Ga-2In filler metal was observed by SEM, and the significant 'framework 'structure' was found in the matrix. Source

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