Vacuum Brazing of 55 vol.% SiCp/ZL102 Composites Using Micro-Nano Brazing Filler Metal Fabricated by Melt-Spinning
2. Materials and Methods
3. Results and Discussion
3.1. Thermodynamic Property and Microstructural Characteristics of the Brazing Filler Metal
3.2. Microstructure and Element Distribution Analysis of Brazed Joints
3.3. Mechanical Properties of Brazed Joints
3.4. Fracture Analysis of Brazed Joints
- Using melt-spinning technology, the foil-like brazing filler metal Al-17.0Cu-8.0Mg was obtained. The microstructure analysis indicated that the foil-like brazing filler metal mainly contained uniformed cellular nano grains, with a size less than 200 nm. The solidus and liquidus temperatures of the foil-like brazing filler metal decreased by 4 °C and 7 °C in comparison with the values of the as-cast brazing filler metal due to the nanometer size effect. Compared with the brazing filler metal prepared by conventional methods, the micro-nano brazing filler metal had higher toughness, lower melting point, and better diffusibility, which were more conducive to the wetting and spreading behavior between the brazing filler metal and base material.
- The microstructure observation indicated that brazed joints were continuous and tightly bonded, without physical defects such as micro-voids and cracks when the brazing temperature exceeded 570 °C. Moreover, the width of the brazing seam became narrower and narrower with increasing brazing temperature owning to the strong interaction between the micro-nano brazing filler metal and 55 vol.% SiCp/ZL102 composites. Some white block phases mainly containing elements Al and Cu appeared near the brazing seam. The main diffusion path for Cu was the interface between the SiC particle and aluminum. After brazing, the chemical concentration gradient between the brazing filler metal and base material disappeared.
- The maximum joint shear strength was achieved at 98.17 MPa at the brazing temperature of 580 °C. The joint shear strength increased in the temperature range of 560 °C to 580 °C. However, a further increase in the brazing temperature to 590 °C and 600 °C caused a decrease in shear strength to 80.25 MPa and 60.36 MPa, respectively. The excessive interaction in the joint and matrix caused the generation and growth of brittle intermetallics such as Al2Cu and AlCu having a remarkable influence on the shear strength.
- The fracture morphology of the joint made at a brazing temperature of 580 °C was characterized by quasi-cleavage fracture. Fractures occurred in the brazing seam rather than the interface between the brazing filler metal and 55 vol.% SiCp/ZL102 composites since no SiC particles could be found in the fracture surface. There was no large blocked intermetallic compound in the joint, and this would be very beneficial in terms of increasing the joint mechanical properties.
Conflicts of Interest
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Qiu, D.; Gao, Z.; Ba, X.; Wang, Z.; Niu, J. Vacuum Brazing of 55 vol.% SiCp/ZL102 Composites Using Micro-Nano Brazing Filler Metal Fabricated by Melt-Spinning. Metals 2020, 10, 1470. https://doi.org/10.3390/met10111470
Qiu D, Gao Z, Ba X, Wang Z, Niu J. Vacuum Brazing of 55 vol.% SiCp/ZL102 Composites Using Micro-Nano Brazing Filler Metal Fabricated by Melt-Spinning. Metals. 2020; 10(11):1470. https://doi.org/10.3390/met10111470Chicago/Turabian Style
Qiu, Dechao, Zeng Gao, Xianli Ba, Zhenjiang Wang, and Jitai Niu. 2020. "Vacuum Brazing of 55 vol.% SiCp/ZL102 Composites Using Micro-Nano Brazing Filler Metal Fabricated by Melt-Spinning" Metals 10, no. 11: 1470. https://doi.org/10.3390/met10111470