Transient liquid phase bonding of AA 6082 aluminium alloy

Schällibaum, J.; Burbach, Thomas; Münch, C.; Weiler, W.; Wahlen, Arne

doi:10.1002/mawe.201500402

Cited by 10 publications

(3 citation statements)

References 12 publications

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“…EDS analyses on the foam surfaces evidenced the presence of C, O, Mg and Al on AF1 samples, and of C, O, Al and Si on the AF2 samples. Moreover, the AF1 samples showed numerous particles rich in O and Mg, attributable to the Mg-rich oxides and carbonates frequently observed on Al-Mg alloys [5][6][7]. These particles are hardly removed; only mechanical grinding can detach them from the surface.…”

Section: Resultsmentioning

confidence: 99%

Aluminum Foams as Permanent Cores in Casting

Ferraris

Ubertalli

Santostefano

et al. 2021

The 1st International Electronic Conference on Metallurgy and Metals

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Their low density and high specific stiffness and impact energy/vibration absorption ability make Al-based metal foams promising materials in applications for which a light weight and energy/vibration absorption abilities are crucial. In view of these properties, Al-based foams can be extremely interesting as cores in cast components in order to improve their performances and simplify their whole technological process. However, both in the scientific literature and in technological application, this topic is still poorly explored. In the present work, Al-based metal foams (Cymat foams and Havel metal foams in the form of rectangular bars) are used in a gravity casting experiment of an Al-Si-Cu-Mg alloy (EN AB-46400). The foams were fully characterized before and after insertion in casting. Porosity, cell wall and external skin thickness, microstructure, infiltration degree, and the quality of the interface between the foam core and the dense cast shell, have been investigated by means of optical microscopy and scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS). The analyses evidenced that a continuous and thick external skin protect the foam from infiltration by molten metal, preserving the initial porosity and insert shape. A detailed analysis of the foam’s external skin highlights that the composition of this external skin is crucial for the obtaining of a good joining between the molten metal and the Al foam core. In fact, the presence of Mg oxides on the foam surface prevents bonding, and maintains a gap between the core and the shell. This point opens up the opportunity to design innovative surface modifications for this external skin as promising strategies for the optimization of cast components with a foam core.

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Section: Resultsmentioning

confidence: 99%

Aluminum Foams as Permanent Cores in Casting

Ferraris

Ubertalli

Santostefano

et al. 2021

The 1st International Electronic Conference on Metallurgy and Metals

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show abstract

“…Contact reactive brazing is a kind of brazing method without any brazing flux [ 21 ], which has been widely applied for brazing Al alloys to other alloys, such as Al6063 [ 22 ], Al6061 to AZ31B Mg alloy [ 23 ], and Al6063 to 1Cr18Ni9Ti stainless steel [ 24 ]. Schällibaum et al [ 25 ] studied the microstructure of the AA6082 brazed joints with plating copper, and the results showed that the formation of defects was caused by the residual oxide films aggregated in the brazed joint. Wu et al [ 24 ] used Cu as an interlayer to join Al6063 and 1Cr18Ni9Ti stainless steel by contact reactive brazing.…”

Section: Introductionmentioning

confidence: 99%

Contact Reactive Brazing of TC4 Alloy to Al7075 Alloy with Deposited Cu Interlayer

Yang

Niu

et al. 2021

Materials

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The brazing of Titanium alloy to Aluminum alloy is of great significance for lightweight application, but the stable surface oxide film limits it. In our work, the surface oxide film was removed by the ion bombardment, the deposited Cu layer by magnetron sputtering was selected as an interlayer, and then the contact reactive brazing of TC4 alloy to Al7075 alloy was realized. The microstructure and joining properties of TC4/Al7075 joints obtained under different parameters were observed and tested, respectively. The results revealed that the intermetallic compounds in the brazing seam reduced with the increased brazing parameters, while the reaction layer adjacent to TC4 alloy continuously thickened. The shear strength improved first and then decreased with the changing of brazing parameters, and the maximum shear strength of ~201.45 ± 4.40 MPa was obtained at 600 °C for 30 min. The fracture path of TC4/Al7075 joints changed from brittle fracture to transgranular fracture, and the intergranular fracture occurred when the brazing temperature was higher than 600 °C and the holding time exceeded 30 min. Our work provides theoretical and technological analyses for brazing TC4/Al7075 and shows potential applications for large-area brazing of titanium/aluminum.

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“…One of the main obstacles to the effective brazing of Al alloys is the presence of a stable oxide layer on the surface with high melting temperature and poor reactivity, which act as a barrier for metallurgical interaction between the aluminum alloy substrate and the brazing material [9,10]. Particularly critical from this point of view are the Al alloys of the 5000 series because of high magnesium content, which promotes the development of a thick and stable magnesium oxide layer.…”

Section: Introductionmentioning

confidence: 99%

Surface Activation and Characterization of Aluminum Alloys for Brazing Optimization

2019

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Brazing of Al-alloys is of interest in many application fields (e.g., mechanical and automotive). The surface preparation of substrates and the in depth investigation of the interface reaction between aluminum substrates and brazing materials is fundamental for a proper understanding of the process and for its optimization. The interaction between two aluminum based substrates (Al5182 and Al6016) and two studied brazing materials (pure Zn and for the first time ZAMA alloy) has been studied in simulated brazing condition in order to define the best surface preparation conditions and combination substrate-brazing material to be used in real joining experiments. Three different surface preparations were considered: polishing and cleaning, application of flux and vacuum plasma etching (Ar) followed by sputtering coating with Zn. Macroscopic observation of the samples surface after “brazing”, optical microscopy, and microhardness measurements on the cross-section and XRD measurements on the top surface gave a comprehensive description of the phenomena occurring at the interface between the substrate and the brazing alloy which are of interest to understand the brazing process and for the detection of the best conditions to be used in brazing. Plasma etching (Ar) followed by sputtering coating with Zn resulted a promising solution in case of Al5182 brazed with Zn, while the addition of flux was more effective in case of Al6016 substrate. ZAMA alloy demonstrated good interface reactivity with both Al6016 and Al5182 alloys, particularly on only cleaned surfaces.

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Transient liquid phase bonding of AA 6082 aluminium alloy

Cited by 10 publications

References 12 publications

Aluminum Foams as Permanent Cores in Casting

Aluminum Foams as Permanent Cores in Casting

Contact Reactive Brazing of TC4 Alloy to Al7075 Alloy with Deposited Cu Interlayer

Surface Activation and Characterization of Aluminum Alloys for Brazing Optimization

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