Controlled precipitation of intermetallic (Al,Si)3Ti compound particles on double oxide films in liquid aluminum alloys

Gyarmati, Gábor; Fegyverneki, György; Kéri, Zoltán; Molnár, Dániel; Tokaŕ, M. Z.; Varga, László; Mende, Tamás

doi:10.1016/j.matchar.2021.111467

Cited by 11 publications

(5 citation statements)

References 95 publications

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“…It is interesting to note that the number of pores was decreasing significantly while their sizes increased dramatically. The decrease in the number of pores is possibly due to the sedimentation of Fe phases on bifilms as was suggested by Gyarmati [23]. Similar RPT samples and pore distributions were observed in their study.…”

Section: Resultssupporting

confidence: 86%

Archives of Foundry Engineering

Bas,

Alper,

Tuncay

et al. 2022

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The solubility of Fe in aluminium alloys is known to be a problem in the casting of aluminium alloys. Due to the formation of various intermetallic phases, the mechanical properties decrease. Therefore, it is important to determine the formation mechanisms of such intermetallic. In this work, A360 alloy was used, and Fe additions were made. The alloy was cast into the sand and die moulds that consisted of three different thicknesses. In this way, the effect of the cooling rate was investigated. The holding time was selected to be 5 hours and every hour, a sample was collected from the melt for microstructural analysis. Additionally, the melt quality change was also examined by means of using a reduced pressure test where the bifilm index was measured. It was found that the iron content was increased after 2 hours of holding and the melt quality was decreased. There was a correlation between the duration and bifilm index. The size of Al-Si-Mn-Fe phases was increased in parallel with the bifilm content regardless of the iron content.

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Section: Resultssupporting

confidence: 86%

Archives of Foundry Engineering

Bas,

Alper,

Tuncay

et al. 2022

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“…Thus, boron present in the SrB6 With respect to oxide bifilms, the addition of Al-5Ti-1B refiner to the A356 alloy showed itself effective in reducing their amount. (Al,Si) 3 Ti particles nucleate on the wetted surfaces of bifilms and tend to decant towards the bottom of the crucible due to their higher density; in this process, oxide films tend to follow [78,79]. One one hand, such attachment is obviously advantageous to reduce bifilm content and porosity; on the other hand, Gyarmati demonstrated that these intermetallic particles could also bind to oxide layers on the surface of the melt, leading to a possible Ti segregation in the top region [79].…”

Section: Grain Refinersmentioning

confidence: 99%

The Influence of Alloying Elements on the Microstructure and Properties of Al-Si-Based Casting Alloys: A Review

Callegari

Lima

Coelho

2023

Metals

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The excellent casting behavior and mechanical and corrosion properties of aluminum-silicon (Al-Si)-based alloys make them ideal for the manufacture of lightweight components with complex geometries. However, these properties depend directly on their microstructure, which, in its turn, is strongly affected by the composition of the alloy, among other factors. Several elements can be added to the material aiming to promote microstructural changes, e.g., grain refinement, optimization of phase morphology and distribution, and precipitation strengthening. Efforts are continuously put into such enhancements of cast Al alloys since they lead to quality improvements that allow for weight reduction and safety increase. Considering the technological relevance of the subject, this paper provides an overview of the research focused on the addition of alloying elements to these alloys, with a greater focus on Al-Si-based systems and the comprehension of the effects of these additions on their microstructure and properties.

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“…This can be achieved by numerous methods: rotary degassing can be combined with flux treatments; filters or sedimentation techniques can be used, as well as the casting technology itself should be optimized for avoiding entrainment defects. [61,62] In this case, the relatively large tendency to shrinkage must be compensated by an appropriate feeding system design. Where high structural integrity is not the main requirement (which is often the case when high pressure die cast (HPDC) components are manufactured with high productivity rates), low bifilm and hydrogen content are not crucial.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Rotary Degassing Treatments with Different Purging Gases on the Double Oxide- and Nitride Film Content of Liquid Aluminum Alloys

Gyarmati

Vincze

Fegyverneki

et al. 2022

Metall Mater Trans B

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Rotary degassing is one of the most frequently used melt treatment technologies used for processing liquid aluminum alloys. Despite this, the information available about the possible effects of this method on the double oxide- and nitride film (bifilm) content, especially when using different purging gases, is quite limited. For this reason, in this study, the effects of multiple rotary degassing treatments conducted with N2 and Ar purging gases on the bifilm quantity of a casting aluminum alloy were compared. The characterization of the melt quality was realized by the computed tomographic (CT) analysis of reduced pressure test (RPT) specimens, image analysis, and scanning electron microscopy (SEM) of the fracture surfaces of K-mold samples. Based on the results, by the application of Ar as a purging gas, relatively low bifilm content can be achieved. On the other hand, while the use of N2 leads to the formation of numerous small-sized nitride bifilms, which significantly increased the pore number density inside the RPT specimens. This can be associated with the nitride formation by the chemical reaction between the liquid aluminum alloy and the N2 purging gas bubbles during the degassing treatments. Graphical abstract

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Controlled precipitation of intermetallic (Al,Si)3Ti compound particles on double oxide films in liquid aluminum alloys

Cited by 11 publications

References 95 publications

Archives of Foundry Engineering

Archives of Foundry Engineering

The Influence of Alloying Elements on the Microstructure and Properties of Al-Si-Based Casting Alloys: A Review

The Effect of Rotary Degassing Treatments with Different Purging Gases on the Double Oxide- and Nitride Film Content of Liquid Aluminum Alloys

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