scholarly journals Vacuum Brazing of 55 vol.% SiCp/ZL102 Composites Using Micro-Nano Brazing Filler Metal Fabricated by Melt-Spinning

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1470
Author(s):  
Dechao Qiu ◽  
Zeng Gao ◽  
Xianli Ba ◽  
Zhenjiang Wang ◽  
Jitai Niu
Keyword(s):  
Melt Spinning ◽  
Filler Metal ◽  
Aluminum Matrix ◽  
Chemical Properties ◽  
Base Material ◽  
Fracture Morphology ◽  
Aluminum Matrix Composites ◽  
Joint Shear Strength ◽  
Vacuum Brazing ◽  
Sic Particles

The joining methods of Aluminum matrix composites reinforced with SiC particles (SiCp/Al MMCs) are a challenge during the manufacturing process due to the significant differences between SiC particles and base aluminum in terms of both physical and chemical properties. Micro-nano brazing filler metal Al-17.0Cu-8.0Mg fabricated by melt-spinning technology was employed to deal with the joining problem of 55 vol.% SiCp/ZL102 composites in this work. The result indicated that the foil-like brazing filler metal 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. The maximum joint shear strength of 98.17 MPa achieved with a brazing temperature of 580 °C and holding time of 30 min was applied in vacuum brazing process. 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. The fracture morphology of the joint made at a brazing temperature of 580 °C was characterized by quasi-cleavage fracture. After brazing, the chemical concentration gradient between the brazing filler metal and base material disappeared.

Vacuum brazing of high volume fraction SiC particles reinforced aluminum matrix composites

2015 ◽  
Vol 29 (06n07) ◽  
pp. 1540002 ◽  
Author(s):  
Dongfeng Cheng ◽  
Jitai Niu ◽  
Zeng Gao ◽  
Peng Wang
Keyword(s):  
Electron Microscopy ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
High Volume ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Alloy Matrix ◽  
Vacuum Brazing ◽  
Sic Particles ◽  
A356 Aluminum

This experiment chooses A356 aluminum matrix composites containing 55% SiC particle reinforcing phase as the parent metal and Al – Si – Cu – Zn – Ni alloy metal as the filler metal. The brazing process is carried out in vacuum brazing furnace at the temperature of 550°C and 560°C for 3 min, respectively. The interfacial microstructures and fracture surfaces are investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy spectrum analysis (EDS). The result shows that adequacy of element diffusion are superior when brazing at 560°C, because of higher activity and liquidity. Dislocations and twins are observed at the interface between filler and composite due to the different expansion coefficient of the aluminum alloy matrix and SiC particles. The fracture analysis shows that the brittle fracture mainly located at interface of filler and composites.

scholarly journals Joining of Silicon Particle-Reinforced Aluminum Matrix Composites to Kovar Alloys Using Active Melt-Spun Ribbons in Vacuum Conditions

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2965 ◽  
Author(s):  
Zeng Gao ◽  
Xianli Ba ◽  
Huanyu Yang ◽  
Congxin Yin ◽  
Shanguang Liu ◽  
...  
Keyword(s):  
Filler Metal ◽  
Silicon Particle ◽  
Intermetallic Phase ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Joint Shear Strength ◽  
Joint Fracture ◽  
Melt Spun ◽  
Melt Spun Ribbons

The vacuum brazing of dissimilar electronic packaging materials has been investigated. In this research, this applies silicon particle-reinforced aluminum matrix composites (Sip/Al MMCs) to Kovar alloys. Active melt-spun ribbons were employed as brazing filler metals under different joining temperatures and times. The results showed that the maximum joint shear strength of 96.62 MPa was achieved when the joint was made using Al-7.5Si-23.0Cu-2.0Ni-1.0Ti as the brazing filler metal at 580 °C for 30 min. X-ray diffraction (XRD) analysis of the joint indicated that the main phases were composed of Al, Si and intermetallics, including CuAl, TiFeSi, TiNiSi and Al3Ti. When the brazing temperature ranged from 570 °C to 590 °C, the leakage rate of joints remained at 10−8 Pa·m3/s or better. When the joint was made using Al-7.5Si-23.0Cu-2.0Ni-2.5Ti as the brazing filler metal at 580 °C for 30 min, the higher level of Ti content in the brazing filler metal resulted in the formation of a flake-like Ti(AlSi)3 intermetallic phase with an average size of 7 µm at the interface between the brazing seam and Sip/Al MMCs. The joint fracture was generally in the form of quasi-cleavage fracture, which primarily occurred at the interface between the filler metal and the Sip/Al MMCs. The micro-crack propagated not only Ti(AlSi)3, but also the Si particles in the substrate.

Research on Fabrication and Semisolid Processing of Semisolid Slurries of 7075 Aluminum Matrix Composites Reinforced with Nano-Sized SiC Particles

2016 ◽  
Vol 256 ◽  
pp. 81-87 ◽  
Author(s):  
Ju Fu Jiang ◽  
Ying Wang ◽  
Shou Jing Luo
Keyword(s):  
Acoustic Streaming ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composite ◽  
Aluminum Matrix Composites ◽  
Semisolid Slurry ◽  
Matrix Composites ◽  
Good Surface ◽  
Sic Particles ◽  
The Matrix ◽  
Cylindrical Parts

Semisolid slurries of 7075 aluminum matrix composite reinforced with nano-sized SiC particles were fabricated by ultrasonic assisted semisolid stirring (UASS) method. Rheoforming and thixoforming of typical cylindrical parts were investigated. The results show that high-quality semisolid slurries with spheroidal solid grain of 38 µm were fabricated by UASS. The nano-sized SiC particles were dispersed uniformly due to transient cavitation and acoustic streaming of ultrasonic wave and high and controllable viscosity of semisolid slurry. Typical cylindrical composite parts with good surface quality and complete filling were rheoformed and thixoformed successfully. Ultimate tensile strength (UTS) of the rheoformed and thixoformed composite parts are enhanced due to addition of nano-sized SiC particles. However, elongation decreased as compared to those of the matrix parts. Maximum UTS of 550 MPa was achieved in the thixoformed composite part with T6 treatment. Increase of dislocation density around the reinforcement particles leads to improvement of the strength and wear resistance of the composite.

Microstructure and Mechanical Performance of Ultrasonically Brazed Joints of High Fraction Volume of SiC Particulate Reinforced Aluminum Matrix Composites

2011 ◽  
Vol 291-294 ◽  
pp. 910-914
Author(s):  
Yang Zhang ◽  
Cha Qin ◽  
Hao Zhu
Keyword(s):  
Shear Strength ◽  
Mechanical Performance ◽  
Filler Metal ◽  
Aluminum Matrix ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Brazed Joints ◽  
High Fraction ◽  
Wetted Area ◽  
Particulate Reinforced

The ultrasonically brazing of 55 vol.% SiCp/A356 composites in air has been investigated. When the ultrasonic vibration is applied for 0.5s, the oxide layer is still continuous at most places between the filler metal and the composites. The shear strength is only ~30% of that of the base composites. As the ultrasonic action time increases, the oxide film sufficiently disappears in the bond region, and the wetted area between the filler metal and SiC particles increases gradually. As a consequence of this, the shear strength of bonds also increases with the ultrasonically acting time. The maximum value of the shear strength of the bonds reaches 165.5MPa when the ultrasonic acting time increases to 5s, which is similar to the shear strength of the base composites.

scholarly journals Study on Meso-scale Grinding Surface Roughness and Sub-surface Quality of High Volume Fraction SiCp/Al2024 composites

2021 ◽  
Author(s):  
Guangyan Guo ◽  
Qi Gao ◽  
Quanzhao Wang ◽  
Yuanhe Hu
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Volume Fraction ◽  
Aluminum Matrix ◽  
High Volume ◽  
High Volume Fraction ◽  
Aluminum Matrix Composites ◽  
Sic Particles ◽  
Meso Scale

Abstract In order to improve the surface grinding quality of high volume fraction aluminum matrix composites, the cutting tool models with different rake angles are established, the grinding process is simulated, and the material removal mechanism and the broken state of SiC particles are obtained. Through single factor experiment, the 60% volume fraction SiCp/Al2024 composites are ground by diamond grinding rod with 3mm diameter, the surface roughness (Ra) is measured, and the surface and sub-surface quality of SiCp/Al2024 composites with meso-scale grinding is investigated. Meanwhile, the influence mechanism of grinding depth (ap) on surface quality is put forward, and the influence of different grinding depth on the fragmentation of SiC particles in sub-surface layer is discussed, which verifies the correctness of grinding simulation. The relevant research and theoretical model are of great significance to the study of grinding properties of composite materials.

Welding of Aluminum Matrix Composites

2013 ◽  
Vol 762 ◽  
pp. 476-482
Author(s):  
Ji Tai Niu ◽  
Zeng Gao ◽  
Dong Feng Cheng ◽  
Xi Tao Wang ◽  
Si Jie Chen
Keyword(s):  
Metal Matrix ◽  
Research Team ◽  
Aluminum Matrix ◽  
Diffusion Welding ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Vacuum Brazing ◽  
The Poor ◽  
Aluminum Metal ◽  
Aluminum Metal Matrix Composites

Aluminum metal matrix composites (Al-MMCs) are new promising materials for aviation, aerospace and automotive industries. However, due to the poor weldability they have very limited applications. In this paper, the authors present the welding achievements of Al-MMCs developed by their scientific research team in recent years. Laser welding, liquid phase impact diffusion welding and vacuum brazing were utilized. Based on analysis of microstructure, good joints can be achieved by using these welding methods.

Microstructural Characterization of Sprayed Aluminum Matrix Composites Reinforced by SiC Particles

2007 ◽  
Vol 546-549 ◽  
pp. 657-660
Author(s):  
Ming Hu ◽  
Hai Ting Hu ◽  
Zheng Xiao Hong ◽  
Suk Bong Kang ◽  
Kwang Jun Euh
Keyword(s):  
Aluminum Matrix ◽  
Thermal Spraying ◽  
Microstructural Characterization ◽  
Energy Dispersive Spectrum ◽  
Optical Microscope ◽  
Aluminum Matrix Composites ◽  
Matrix Composites ◽  
Selected Area Electron Diffraction ◽  
Sic Particles ◽  
Electronic Microscope

The microstructures of sprayed SiCp/Al composite fabricated by thermal spraying technique by optical microscope (OM)scanning electronic microscope (SEM), transmission electronic microscope (TEM), X-ray (diffractometer) XRD, selected area electron diffraction (SAED), energy dispersive spectrum (EDS) techniques, were investigated. The composite consisted of SiC and Al, along with single crystal Si and amorphorous Si, and tiny Al2O3. The interfaces between SiC particles and Al matrix bonded well, and tiny reactants like Al2O3 were found near the interfaces. The mechanisms of chemical reactions during sprayin were discussed g. The nano-Al grains and particles were observed in the sprayed composite. The formation of nano-Al grains and particles of SiCp/ Al composites were explained. It has been found that Several interface relationships existed in the sprayed composite.

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