The surface tension of liquid pure aluminium and aluminium-magnesium alloy

García‐Cordovilla, C.; Louis, E.; Pamies, A.

doi:10.1007/bf00551490

Cited by 138 publications

(55 citation statements)

References 6 publications

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“…The corresponding surface tensions variation with temperature (γ(T) = 0.883 − 0.185 × 10 −3 (T − 660)) were used in the present paper. Such values were confirmed by [13]. …”

Section: Experimental Worksupporting

confidence: 60%

Multiphysics Simulation and Experimental Investigation of Aluminum Wettability on a Titanium Substrate for Laser Welding-Brazing Process

Dal

Peyre

2017

Metals

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Abstract:The control of metal wettability is a key-factor in the field of brazing or welding-brazing. The present paper deals with the numerical simulation of the whole phenomena occurring during the assembly of dissimilar alloys. The study is realized in the frame of potential applications for the aircraft industry, considering the case of the welding-brazing of aluminum Al5754 and quasi-pure titanium Ti40. The assembly configuration, presented here, is a simplification of the real experiment. We have reduced the three-dimensional overlap configuration to a bi-dimensional case. In the present case, an aluminum cylinder is fused onto a titanium substrate. The main physical phenomena which are considered here are: the heat transfers, the fluid flows with free boundaries and the mass transfer in terms of chemical species diffusion. The numerical problem is implemented with the commercial software Comsol Multiphysics™, by coupling heat equation, Navier-Stokes and continuity equations and the free boundary motion. The latter is treated with the Arbitrary Lagrangian Eulerian method, with a particular focus on the contact angle implementation. The comparison between numerical and experimental results shows a very satisfactory agreement in terms of droplet shape, thermal field and intermetallic layer thickness. The model validates our numerical approach.

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“…The corresponding surface tensions variation with temperature (γ(T) = 0.883 − 0.185 × 10 −3 (T − 660)) were used in the present paper. Such values were confirmed by [13]. …”

Section: Experimental Worksupporting

confidence: 60%

Multiphysics Simulation and Experimental Investigation of Aluminum Wettability on a Titanium Substrate for Laser Welding-Brazing Process

Dal

Peyre

2017

Metals

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“…However, under the tested conditions, the volatilization of Mg could occur and this lowers the liquid solid interfacial energy, leading to Mg penetration through the interface and subsequent reaction with the substrate. [50] It is also possible that Mg vapors could have formed after the initial penetration of the alloy into the refractory, through the contact region at the interface. After diffusion of the Mg vapors through the porosity network of the monolithic, they could have subsequently nucleated closer to the substrate bottom due to relatively lower temperatures and reacted with the refractory constituents.…”

Section: Resultsmentioning

confidence: 99%

“…Chemical grade silica (Sigma, St. Louis, MO, purity 99 pct) and alumina (Aldrich, Steinheim, Germany, purity 99 pct) were used to simulate monolithic refractory samples with varying silica-alumina ratios in the following ranges: 0, 10,20,30,40,50,70, and 100 pct silica. Al-alloy 7075 was used for this study, because it is frequently used for refractory testing owing to its aggressive nature.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Silica on High-Temperature Interfacial Phenomena of Monolithic Refractories with Al Alloy

Koshy

Gupta

Sahajwalla

et al. 2008

Metall Mater Trans B

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An experimental study was conducted to study the interfacial phenomena between monolithic refractories and Al alloy at 1250°C. Dynamic contact angles of monolithic substrates with varying silica levels were measured using the sessile drop technique, while phases present in the preheated monolithic samples and interfacial reaction products were characterized using X-ray diffraction (XRD) and an electron probe microanalyzer (EPMA). The contact angles in the Al alloy/silica system were found to change much more rapidly as compared to that of the alloy/ alumina system, clearly demonstrating the high wetting tendency of silica. Under the tested conditions, the corundum phase forms at the interface while Mg was found to vaporize from the alloy and accumulate at the bottom of the monolithic substrate. Both these phenomena are shown to influence the intensity of contact angle variations with time and, thereby, the wetting behavior of monolithic substrates. Based on dynamic contact angles and equilibrium calculations, monolithic refractories are further classified into three groups, such that the wetting characteristics of those with compositions in the ranges of 0 to 25 pct, 25 to 45 pct, and >45 pct silica were shown to be dictated by the presence of corundum, mullite, and free silica, respectively, as the predominant phase.

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“…18,19 Hence the literature data on surface tension of pure aluminium are not very useful when foams are concerned. They are highly impure because of the presence of oxygen and several other impurity atoms such as silicon, copper, magnesium etc.…”

mentioning

confidence: 99%

Analysis of liquid metal foams through X-ray radioscopy and microgravity experiments

et al. 2014

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Complex liquid structures such as metallic foams were produced in a furnace that allowed in situ X-ray monitoring of the evolution of the structure and distribution of the liquid in the foam. The experiments were carried out during parabolic flights which provided varying levels of gravity. The evolution of the characteristic liquid fraction profiles due to gravity induced drainage was measured and analysed in terms of the foam drainage equation, obtaining viscosity and surface tension by fitting solutions of the equation to the experimental data. The surface tension of the melt in the foam was decreased up to 40%. Effective viscosities of up to 139 times the viscosity of a pure bulk melt were observed. These effects could be attributed to the smaller influence of solid particles dispersed in the melt and the larger influence of the complex foam structure.

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The surface tension of liquid pure aluminium and aluminium-magnesium alloy

Cited by 138 publications

References 6 publications

Multiphysics Simulation and Experimental Investigation of Aluminum Wettability on a Titanium Substrate for Laser Welding-Brazing Process

Multiphysics Simulation and Experimental Investigation of Aluminum Wettability on a Titanium Substrate for Laser Welding-Brazing Process

Effect of Silica on High-Temperature Interfacial Phenomena of Monolithic Refractories with Al Alloy

Analysis of liquid metal foams through X-ray radioscopy and microgravity experiments

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