Influence of Al-B grain refiner on porosity formation of directionally solidified Al-Si alloys

Uludağ, Muhammet

doi:10.1007/s41230-020-0012-8

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…Grain refinement and eutectic Si modification are effective ways to improve the comprehensive mechanical properties of hypoeutectic Al-Si alloys. Research has shown that adding refiners and modifiers to aluminum melt is the most economical method, including Al-Ti-B [6], Al-Ti-C [7] and Al-B [8], and the metamorphic agents include Na [9], Sr [10] and RE [11], etc. In actual production, refiners and metamorphic agents are often added to aluminum melt in batches, which is not only complicated in process, but also unsatisfactory in the refining and metamorphic effect due to the "Si poisoning effect" [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Si and Holding Time on Ti2Al20La Phase in Al-Ti-La Intermediate Alloy

Da,

Tian,

et al. 2024

Materials

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The effects of holding time and Si on the content, shape size and structure of Ti2Al20La phase in Al-Ti-La intermediate alloy were investigated by an X-ray diffractometer, scanning electron microscope and transmission electron microscope. The results show that the volume fraction and aspect ratio of Ti2Al20La phase in Al-Ti-La intermediate alloy decrease significantly, from 21% and 2.3 without Si addition to 4% and 2.0 with the addition of 2.3 wt.% Si at a holding time of 15 min at 750 °C, respectively. The Si element will attach to the Ti2Al20La phase and form La-Si binary phase at the grain boundary of α-Al. With the increase of holding time from 15 min to 60 min, the content of Ti2Al20La phase in the alloy gradually decreases and the size decreases significantly. Meanwhile, Al11La3 will dissolve and disappear, while the content of La-Si binary phase increases, and part of Ti2Al20La phase transforms into Ti2(Al20−x,Six)La phase.

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Section: Introductionmentioning

confidence: 99%

Effect of Si and Holding Time on Ti2Al20La Phase in Al-Ti-La Intermediate Alloy

Da,

Tian,

et al. 2024

Materials

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“…These master alloys are produced with different titanium and boron contents. The most commonly used master alloys have the titanium and boron contents of 5% and 1%, respectively [ 22 ]. This ratio has been proven to be the most advantageous in practice, as the efficiency of inoculation decreases as this ratio is further increased.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Characteristics of Al-Ti-B Inoculation Wires and Their Addition to the AlSi7Mg0.3 Alloy

et al. 2022

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Commercially supplied inoculation wires have a guaranteed chemical composition but not the size and distribution of individual phases, which are very important for nucleation. Therefore, two commercial alloys used for the inoculation of Al-Si alloys (AlTi3B1 and AlTi5B1) are investigated in this paper. The emphasis is placed on their structural analysis and the size and distribution of individual intermetallic phases. Furthermore, the grain refinement effect will be tested by adding these alloys to the AlSi7Mg0.3 alloy and testing the optimal amount of added inoculation wires. The results showed that the size and distribution of the individual phases in AlTi3B1 and AlTi5B1 meet the requirements for the successful inoculation of aluminum alloys, the intermetallic phases based on the TiAl3 phase are fine enough, and there is no agglomeration that would reduce the number of nuclei. This assumption was confirmed by adding these inoculants to the AlSi7Mg0.3 alloy, and it was found that the most ideal amount of inoculants added is 0.01 wt % when the structure was refined by approximately 32%.

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“…Al-Si eutectic alloys are broadly used in the engineering field due to their low weight ratio, excellent corrosion resistance and cast ability. The mechanical properties of conventional cast Al-Si eutectic alloys are very poor due to the existence of lamellar eutectic silicon in the matrix [1][2][3][4][5]. Therefore, the element Na or the element Sr is usually used to modify the Al-Si eutectic in the process of casting production [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si

Gao

Zhang

et al. 2021

Metals

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In order to fabricate fibrous eutectic Si, the selective etching of industrial Al–Si eutectic alloys directionally solidified at different growth rates and modified by different amounts of Sr was studied. Flake eutectic and fibrous Si were obtained by selective etching of non-modified, Sr-modified or directionally solidified Al–Si eutectic alloys. The optimal amount of Sr for fabricating branching eutectic Si was 0.04–0.07%. Through directional solidification with a high enough growth rate (more than 200 μm/s), lamellar eutectic Si transforms to fibrous eutectic Si for use in non-modified Al–Si eutectic alloys. The potentiodynamic polarization and cyclic voltammetry methods were used to test the corrosion behavior of non-modified and Sr-modified Al–Si eutectic alloys. With a constant potential of 0.5 V in HCl solution, non-modified Al–Si eutectic alloys displayed initial pitting corrosion and subsequent spalling corrosion, and 0.04% Sr-modified samples displayed uniform pitting corrosion. Compared with non-modified Al–Si eutectic alloys, Sr-modified samples displayed better corrosion resistance with lower current density and shallower pit depth during the same etching conditions.

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Influence of Al-B grain refiner on porosity formation of directionally solidified Al-Si alloys

Cited by 7 publications

References 22 publications

Effect of Si and Holding Time on Ti2Al20La Phase in Al-Ti-La Intermediate Alloy

Effect of Si and Holding Time on Ti2Al20La Phase in Al-Ti-La Intermediate Alloy

Microstructural Characteristics of Al-Ti-B Inoculation Wires and Their Addition to the AlSi7Mg0.3 Alloy

Selective Etching of Sr-Modified and Directionally Solidified Industrial Al–Si Eutectic Alloys for Fabricating Fibrous Eutectic Si

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