Sr addition and its effect on the melt cleanliness of A356

Atakav, Baturalp; Gürsoy, Özen; Erzi, Eray; Tur, Kazım; Dışpınar, Derya

doi:10.1088/2053-1591/ab735b

Cited by 6 publications

(3 citation statements)

References 19 publications

(18 reference statements)

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“…On the other hand, the porosity formed due to the precipitation of the dissolved gas during the solidification process is generally spherical. However, there are reports on theories specifically on complex connections between bifilms and gas porosities [36,37].…”

Section: Reduced Pressure Testingmentioning

confidence: 99%

A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

Vijayan,

Shetty,

B N

et al. 2023

Mater. Res. Express

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In this study, we investigated the effects of treating Al-12 wt% silicon alloy with an equimolar composition mixture of NaCl, KCl, and NaF on various aspects of the alloy’s properties. Key findings of the research indicate that the flux treatment had significant effects on the alloy. It led to increased nucleation temperatures and reduced undercooling, thereby facilitating nucleation sites and grain refinement. Additionally, the inclusion of flux reduced the entrapment of inclusions in the melt, which can potentially enhance the mechanical properties of the alloy. However, it also led to a larger and more widely distributed gas porosity in the solidified samples, as gas evolved from the flux trapped during solidification. Moreover, the flux treatment had noticeable impacts on the morphology of eutectic silicon particles, reducing their aspect ratio. These findings offer valuable insights into the potential benefits and challenges of sodium-based flux melt treatment in optimizing the quality of Al-12Si alloy castings, particularly in die-casting applications.

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Section: Reduced Pressure Testingmentioning

confidence: 99%

A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

Vijayan,

Shetty,

B N

et al. 2023

Mater. Res. Express

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“…Oxide Films and Dispersoids. Atakav et al [39] investigated the effect of Sr addition on the melt cleanliness of A356 alloy. Reduced pressure test (RPT) was used to assess melt quality change and it was found that cleanliness was increased due to the fading of Sr.…”

Section: 3mentioning

confidence: 99%

A Review Study on the Main Sources of Porosity in Al-Si Cast Alloys

Samuel

Zedan

Doty

et al. 2021

Advances in Materials Science and Engineering

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The present study was performed on A356 and B319 alloys in mechanically stirred or degassed condition. Melts were Sr-modified and grain-refined. Hydrogen content was varied from less than 0.1 ml/100 g Al to ∼0.4 ml/100 g Al; Fe was increased to 0.8% in B319 alloy. Lanthanum and cerium were added as 99.5% pure metals. Two main techniques were used to investigate porosity formation: fracture surface of tensile or fatigue test bars, or reduced pressure test (RPT) method. Porosity type and shape were examined. The results show that pore size is more influential than small scattered ones from a mechanical point of view. Tensile testing is affected by porosity located at the center of the testing bar, whereas edge porosity is responsible for crack initiation in case of fatigue testing. Intermetallics precipitate in the form of intercepted platelets which restricts the flow of the molten metal, leading to formation of shrinkage cavities. Precipitation of clusters of compounds from the liquid state such as Al2Si2Sr, Mg2Sn, Al3Ti, or added Al2O3particles would as well act as nucleation sites for porosity formation. Most oxides were observed in the form of long branched strings. In some cases, bifilms were also reported in addition to SrO and MgO.

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“…Al‐7Si‐based alloys are widely used for industrial applications, and A356 aluminum alloy is a representative of such alloys as an indispensable material in automotive parts [1]. Particularly, the alloy needs further studies to improve its properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

Ling

Shi

et al. 2022

Materialwissenschaft Werkst

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The effect of the addition of chromium between 0.1 % and 0.3 % on the structure and properties of Al-7Si-0.35Mg-0.02Sr alloy was studied. The results show that as the chromium content increases, the alloy grains are refined, and the grains appear fine equiaxed after 0.2 % chromium addition. At the same time, chromium combines with iron to form AlCrFeSi phase, which significantly improves the iron phase morphology, making it change from needle shape to fish bone shape. In the aging stage, the Al 13 Cr 4 Si 4 phase is dispersed in the alloy, and its phase relationship with the matrix is semi-coherent and non-coherent. When the chromium content continues to increase, the degree of dispersion of the Al 13 Cr 4 Si 4 phase is higher, but the performance of the alloy decreases, because the chromium containing precipitate phase consumes magnesium and silicon solute atoms from the nearby melt, making the amount of magnesium silicide decrease. The Al-7Si-0.35Mg-0.02Sr alloy with 0.2 % chromium showed the best mechanical properties (ultimate tensile strength, yield strength, elongation and hardness).

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Sr addition and its effect on the melt cleanliness of A356

Cited by 6 publications

References 19 publications

A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

A comprehensive analysis of cooling curves, fluidity, inclusions, porosity, and microstructure of NaCl-KCl-NaF flux treated Al-12Si alloy

A Review Study on the Main Sources of Porosity in Al-Si Cast Alloys

Effect of chromium content on microstructure and properties of casting Al‐7Si‐0.35Mg‐0.02Sr alloy

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