Interactions of primary intermetallic compound particles and double oxide films in liquid aluminum alloys

Gyarmati, Gábor; Bubonyi, Tamás; Fegyverneki, György; Tokaŕ, M. Z.; Mende, Tamás

doi:10.1016/j.intermet.2022.107681

Cited by 13 publications

(10 citation statements)

References 68 publications

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“…In the case of the (Al,Si) 3 Ti particle presented in Figure 13 , oxide phases were found not only attached to the particle but also inside it (darker regions in Figure 13 a,c). This is caused by the engulfment of the oxide phase during the growth of the particle, and it is in accordance with our previous study [ 64 ] where this phenomenon was also reported.…”

Section: Resultssupporting

confidence: 93%

“…Indeed, the microscopic investigation of this region ( Figure 10 a) revealed the presence of numerous TiAlSi particles that seem to be attached to the surface oxide layer and its entrained parts. As it was detailed in our previous study [ 64 ], this attachment is caused by the heterogeneous nucleation of (Al,Si) 3 Ti particles on the surface oxide film and the partial engulfment of some parts of the oxide films during the growth of the particles.…”

Section: Resultsmentioning

confidence: 95%

“…On the contrary, the particles created during the two experiments consist of two phases: an (Al,Si) 3 Ti phase that is lower in Si and Ti (points 2 and 4 in Figure 7 ), as well as a phase that has a relatively high Si-concentration (around 57 at.%, point 3 and 5 in Figure 7 ). Based on the results of our previous studies [ 64 , 65 ] and references [ 82 , 83 , 84 ], the latter is the τ 2 phase, which is created by the transformation of the (Al,Si) 3 Ti during the slow cooling of the samples.…”

Section: Resultsmentioning

confidence: 99%

“…The early pioneering work by Mountford and Calvert [ 61 ] and the recent studies by Gursoy et al [ 62 ], as well as Gurtaran and Uludağ [ 63 ], showed that the settling of Ti-rich compounds can reduce the bifilm content of the upper regions of liquid aluminum alloy melts. Our previous works [ 64 , 65 ] revealed that primary (Al,Si) 3 Ti grain refiner particles are heterogeneously nucleated on oxide films and that during the growth of (Al,Si) 3 Ti particles, oxide film segments became engulfed. In this way, (Al,Si) 3 Ti IMCs were attached to bifilms, which facilitated their mutual settling.…”

Section: Introductionmentioning

confidence: 99%

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Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Gyarmati

Bogoly²,

Stawarz³

et al. 2022

Materials

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Grain refiner particles, which are intended to induce the formation of fine equiaxed grain structure during the solidification of aluminum alloys, are prone to settling during the holding of the liquid metal, which phenomenon can affect not only the grain size but the spatial distribution of the double oxide films in the melt. In this study, the settling of Al3Ti inoculant particles, as well as its effects on melt quality and grain refinement, were studied. During the experiments, the Ti-concentration of a liquid Al-Si-Mg-Cu alloy was increased to 0.3 wt.% by the addition of Al-10%Ti master alloy at different melt temperatures. Particle settling and grain size evolution were studied by quantitative metallography, while the interactions of grain refiners and bifilms were investigated by scanning electron microscopy (SEM). The evolution of melt quality was assessed by the computed tomographic (CT) analysis of reduced pressure test (RPT) samples. It was found that effective grain refinement was only realized when the introduced blocky Al3Ti particles were dissolved and re-precipitated in the form of (Al,Si)3Ti at a lower temperature. Without dissolving at higher holding temperatures, Al3Ti particle settling has taken place within 10 min. The settling of (Al,Si)3Ti particles improved melt quality by the aided sedimentation of bifilms in the melt.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Gyarmati

Bogoly²,

Stawarz³

et al. 2022

Materials

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“…Ramesh et al [12] mentioned in their research that aluminium typically develops a protective oxide layer on its surface in atmospheric conditions. However, the presence of corrosion pits can significantly disrupt the uniformity of this oxide layer [84]. This effect is particularly pronounced with a longer duration, resulting in a defective oxide layer.…”

Section: Effect Of Corrosive Solutionmentioning

confidence: 99%

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Alqahtani,

Starr,

Khan

2024

Metals

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Aluminium alloys have been integral to numerous engineering applications due to their favourable strength, weight, and corrosion resistance combination. However, the performance of these alloys in coastal environments is a critical concern, as the interplay between fracture toughness and fatigue crack growth rate under such conditions remains relatively unexplored. This comprehensive review addresses this research gap by analysing the intricate relationship between fatigue crack propagation, fracture toughness, and challenging coastal environmental conditions. In view of the increasing utilisation of aluminium alloys in coastal infrastructure and maritime industries, understanding their behaviour under the joint influences of cyclic loading and corrosive coastal atmospheres is imperative. The primary objective of this review is to synthesise the existing knowledge on the subject, identify research gaps, and propose directions for future investigations. The methodology involves an in-depth examination of peer-reviewed literature and experimental studies. The mechanisms driving fatigue crack initiation and propagation in aluminium alloys exposed to saltwater, humidity, and temperature variations are elucidated. Additionally, this review critically evaluates the impact of coastal conditions on fracture toughness, shedding light on the vulnerability of aluminium alloys to sudden fractures in such environments. The variability of fatigue crack growth rates and fracture toughness values across different aluminium alloy compositions and environmental exposures was discussed. Corrosion–fatigue interactions emerge as a key contributor to accelerated crack propagation, underscoring the need for comprehensive mitigation strategies. This review paper highlights the pressing need to understand the behaviour of aluminium alloys under coastal conditions comprehensively. By revealing the existing research gaps and presenting an integrated overview of the intricate mechanisms at play, this study aims to guide further research and engineering efforts towards enhancing the durability and safety of aluminium alloy components in coastal environments.

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Entrained Defects in A356 Semisolid Slurry Produced by RSF and CSC Processes

Liu,

Li,

Guo

et al. 2024

Metall Mater Trans B

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Interactions of primary intermetallic compound particles and double oxide films in liquid aluminum alloys

Cited by 13 publications

References 68 publications

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Grain Refiner Settling and Its Effect on the Melt Quality of Aluminum Casting Alloys

Fracture Behaviour of Aluminium Alloys under Coastal Environmental Conditions: A Review

Entrained Defects in A356 Semisolid Slurry Produced by RSF and CSC Processes

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