Materials Reports  2019, Vol. 33 Issue (z1): 425-427 |
| METALS AND METAL MATRIX COMPOSITES |
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| Evolution of Microstructure and Properties of BAg45CuZn Brazing Filler Metal During Vulcanization |
| ZHANG Guanxing, XUE Hangyan, LONG Weimin, ZHONG Sujuan, SUN Huawei, DONG Hongwei
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| State Key Laboratory of Advanced Brazing Filler Metals & Technology, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450001 |
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Abstract The microstructure and properties of BAg45CuZn sulpherized was studied by means of scanning electron microscopy and XRD. The results showed that with the prolongation of vulcanization time, the sulfur atoms began to diffuse into the core of the brazing filler metal. Although the microstructure of the crucible still had two phase compositions, the presence of sulfur in some solid solutions was found. The phase composition of the brazing filler metal were CuS, Cu2S, ZnS, Ag2S and Ag3CuS2. With the prolongation of sulpherizing corrosion time, the sulphur content in the brazing filler metal increased continuously, and the tensile strength of the brazing filler metal decreased from 658 MPa to 542 MPa. The fracture morphology of the brazing filler metal without sulphide corrosion was typical ductile fracture, and the macroscopic fracture was rough with no metallic luster and obvious macroscopic plastic deformation before fracture. With the prolongation of vulcanization time, the fracture type of brazing filler metal changed from ductile fracture to brittle cleavage fracture, and the fracture contained a large amount of inclusions.
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Published: 05 July 2019
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| About author:: Guanxing Zhang received her Ph.D. degree in mechanical design and theory in June 2015. Her research interests focus on the advanced metals with national research priority, mainly engaged in the research work of new brazing materials and advanced forming technology. She has published more than 20 journal papers as the first author, including 8 SCI and EI searches; applied 12 national invention patents and 10 of them were authorized. She has participated in the completion of 11 scientific research projects such as 973, 863, major science and technology special projects, and 1 monograph. She won 3 first prizes for provincial and ministerial level scientific and technological progress and 2 special prizes for Zhengzhou Science and Technology Progress Award. |
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