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Metals 2019, 9(2), 198; https://doi.org/10.3390/met9020198

Development of Low Silver AgCuZnSn Filler Metal for Cu/Steel Dissimilar Metal Joining

1
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China
3
State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001, China
4
College of Materials Science and Technology, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
5
Jinhua Jinzhong Welding Materials Co., Ltd., Jinhua 321016, China
*
Author to whom correspondence should be addressed.
Received: 20 January 2019 / Revised: 4 February 2019 / Accepted: 6 February 2019 / Published: 8 February 2019
(This article belongs to the Special Issue Dissimilar Metal Welding)
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Abstract

The microstructure and properties of a Cu/304 stainless steel dissimilar metal joint brazed with a low silver Ag16.5CuZnSn-xGa-yCe braze filler after aging treatment were investigated. The results indicated that the addition of Ce could reduce the intergranular penetration depth of the filler metal into the stainless steel during the aging process. The minimum penetration depth in the Ag16.5CuZnSn-0.15Ce brazed joint was decreased by 48.8% compared with the Ag16.5CuZnSn brazed joint. Moreover, the shear strength of the brazed joint decreased with aging time while the shear strength of the AgCuZnSn-xGa-yCe joint was still obviously higher than the Ag16.5CuZnSn joint after a 600 h aging treatment. The fracture type of the Ag16.5CuZnSn-xGa-yCe brazed joints before aging begins ductile and turns slightly brittle during the aging process. Compared to all the results, the Ag16.5CuZnSn-2Ga-0.15Ce brazed joints show the best performance and could satisfy the requirements for cost reduction and long-term use. View Full-Text
Keywords: Ag-Cu-Zn; Rare earth; aging treatment; microstructure; mechanical properties Ag-Cu-Zn; Rare earth; aging treatment; microstructure; mechanical properties
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Xue, P.; Zou, Y.; He, P.; Pei, Y.; Sun, H.; Ma, C.; Luo, J. Development of Low Silver AgCuZnSn Filler Metal for Cu/Steel Dissimilar Metal Joining. Metals 2019, 9, 198.

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