Time-dependent corrosion properties of Sr-modified AlSi9 alloy analyzed by electrochemical techniques

Duygun, İnal Kaan; Ağaoğlu, Gökçe Hapçı; Dışpınar, Derya; Orhan, Gökhan

doi:10.1016/j.jallcom.2019.06.330

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…The strontium content of 0.048% is particularly important. According to the publication by Duygun et al [16], this measured proportion is suitable for the refinement of AlSi alloys.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…The shape of the silicon solidifying in the (residual) eutectic affects the ductility of the castings. The coarse Al-Si needles or platelets are shown in Figure 1A; they greatly reduce ductility [16]. Refining the cast structure by adding trace elements, such as strontium (see Figure 1B), leads to an improvement in the morphology of the Si particles [17].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Solidification Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy

Neuser

Grydin

Schaper

2021

Metals

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Implementing the concept of mixed construction in modern automotive engineering requires the joining of sheet metal or extruded profiles with cast components made from different materials. As weight reduction is desired, these cast components are usually made from high-strength aluminium alloys of the Al-Si (Mn, Mg) system, which have limited weldability. The mechanical joinability of the cast components depends on their ductility, which is influenced by the microstructure. High-strength cast aluminium alloys have relatively low ductility, which leads to cracking of the joints. This limits the range of applications for cast aluminium alloys. In this study, an aluminium alloy of the Al-Si system AlSi9 is used to investigate relationships between solidification conditions during the sand casting process, microstructure, mechanical properties, and joinability. The demonstrator is a stepped plate with a minimum thickness of 2.0 mm and a maximum thickness of 4.0 mm, whereas the thickness difference between neighbour steps amounts to 0.5 mm. During casting trials, the solidification rates for different plate steps were measured. The microscopic investigations reveal a correlation between solidification rates and microstructure parameters such as secondary dendrite arm spacing. Furthermore, mechanical properties and the mechanical joinability are investigated.

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“…The strontium content of 0.048% is particularly important. According to the publication by Duygun et al [16], this measured proportion is suitable for the refinement of AlSi alloys.…”

Section: Chemical Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Solidification Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy

Neuser

Grydin

Schaper

2021

Metals

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“…Figure 6 reports the optical microstructure of EN AC 42100-T6 RSC at higher magnifications, showcasing both representative thinnest (4-6) and thickest (15)(16) components. The microstructure is composed of α-aluminum matrix, Al-Si eutectic (indicated by green arrows), β-Al 5 FeSi platelets (highlighted by red arrows), and π-AlFeMgSi Chinese script precipitates (denoted by yellow arrows).…”

Section: Metallographical Analysismentioning

confidence: 99%

“…Another relevant aspect is the shape of silicon in the eutectic. Please note that coarser AlSi platelets greatly reduces ductility [15,16]. It is also common knowledge that the match between refined eutectic Si and smaller SDAS implies a substantial improvement in the strength of the Al-Si alloy [17].…”

Section: Introductionmentioning

confidence: 99%

Additive Manufacturing for Rapid Sand Casting: Mechanical and Microstructural Investigation of Aluminum Alloy Automotive Prototypes

Cecchel,

Cornacchia

2024

Metals

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The automotive industry is undergoing a rapid evolution to meet today’s challenges; therefore, continuous innovation and product development are needed. Validation tests on prototypes play a crucial role in moving new components into industrial production. There is also a pressing need for faster prototyping processes. In this context, rapid sand casting (RSC), based on additive manufacturing technology, offers a promising solution for a quick production of sand molds. While this technology is already employed in the industry, the need to deepen the general understanding of its impact on the casting properties is still a relevant item. In this study, different geometries of automotive prototypes made of aluminum EN AC 42100-T6 alloy were experimentally analyzed. Microstructural examinations, tensile tests, and fractography and porosity analyses were conducted. The findings demonstrate the considerable potential of RSC, giving, in general, high mechanical properties. A comparative analysis with prototypes produced through traditional sand casting revealed similar results, with RSC exhibiting superior yield strength and stress at brake. However, both technologies revealed a reduced elongation percentage, as expected. Future efforts will focus on standardizing the RSC process to enhance ductility levels.

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“…As a part of the main eutectic (αAl + βSi), βSi particles are cathodic with respect to the αAl matrix causing the formation of micro-galvanic couples and localized corrosion phenomena [3]. Even due the effect of βSi particles on microstructure degradation is minimal, due to its high polarization and low current density, increase of eutectic (αAl + βSi) ratio in microstructure will have deleterious effect on the alloy's microstructure [4].…”

Section: Introductionmentioning

confidence: 99%

INFLUENCE OF MODIFICATION ON MICROSTRUCTURE DEGRADATION OF AlSi12 ALLOY EXPOSED TO THE CORROSION ENVIRONMENT

Kozina

Brodarac

2020

METAL 2020 Conference Proeedings

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The corrosion resistance of aluminum-silicon (Al-Si) foundry alloys is a result of microstructure development influenced by melt treatment and solidification. As a part of the main eutectic (αAl + βSi), βSi particles are cathodic with respect to the αAl matrix enabling micro-galvanic couple formation and localized corrosion. Despite its high polarization and low current density, increase in the eutectic (αAl + βSi) will contribute to the microstructure degradation of an alloy in corrosive environment. The research was performed in order to estimate the influence of eutectic βSi particles size on the microstructure degradation of AlSi12 alloy with mixed morphology of eutectic (αAl + βSi). The results of light microscopy indicated preferred initiation and progress of cavities involving modified eutectic (αAl + βSi) with eutectic βSi particles of smaller average particle size. The unmodified eutectic (αAl + βSi) with lamellar morphology and dendrites of primary αAl phase were not visually affected by degradation. The average cavity size and pH value of the solution increase with the increasing exposure time, while microstructure degradation rate decreases.

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Time-dependent corrosion properties of Sr-modified AlSi9 alloy analyzed by electrochemical techniques

Cited by 12 publications

References 35 publications

Effect of Solidification Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy

Effect of Solidification Rates at Sand Casting on the Mechanical Joinability of a Cast Aluminium Alloy

Additive Manufacturing for Rapid Sand Casting: Mechanical and Microstructural Investigation of Aluminum Alloy Automotive Prototypes

INFLUENCE OF MODIFICATION ON MICROSTRUCTURE DEGRADATION OF AlSi12 ALLOY EXPOSED TO THE CORROSION ENVIRONMENT

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