Modification Mechanism of Rare Earth Eu on Eutectic Si in Hypoeutectic Al-Si Alloy

Mao, Feng; Qiao, Yuqing; Zhang, Po; Ou, Liming; Chen, Chong; Zhang, Cheng; Wang, Yu

doi:10.1007/s40962-021-00626-3

Cited by 14 publications

(4 citation statements)

References 40 publications

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“…Heat treatment and mechanical working modifications are time-consuming and unsuitable for bulk production, resulting in increased costs of finished components and products. On the other hand, chemical modification-induced grain refinement is a more popular and cost-effective approach [36,37]. The effectiveness of chemical modification and grain refinement is significantly influenced by the nucleant's density, the alloy's composition, and the cooling conditions [38].…”

Section: Introductionmentioning

confidence: 99%

“…In conclusion, modifying eutectic Si, Fe-based intermetallics, and α-Al grains is critical for the hypoeutectic Al–Si alloys. Several modifiers and refiners have been utilised to modify the Al–Si alloys in recent times, including Bi [3], Al-P master alloy [4], Ag [18], Yb and Gd [34], Eu [37], Ca [41], Al-Ti-Nb-B master alloy [42], Si-Mg-15La master alloy [43], Al-V-B master alloy [44], Mn [10], and Al-Ti-B master alloy [45]. Previous researchers have explored two main modification mechanisms, namely, restricted growth theory and nucleation theory.…”

Section: Introductionmentioning

confidence: 99%

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Thermochemical modelling and mechanical property of the Al-7.6Si-xZr alloy

Biswas

Das

et al. 2023

Materials Science and Technology

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This study utilised the gravity casting method to modify hypoeutectic Al-7.6Si alloys with Zr at varying weight percentages (0.1%, 0.2%, and 0.3%). The unmodified alloy typically consists of a needle or platelike eutectic silicon within the dendritic α-Al phase. The addition of Zr increases the liquidus temperature of the alloy and results in the formation of ZrSi and ZrSi2 compounds, which act as nucleation sites for both the eutectic Si and α-Al grains. As a result, the needle or platelike eutectic silicon transforms into a fibrous structure with a more uniform distribution, and the α-Al phase becomes finer and globular. These microstructural changes lead to improved bulk hardness, ductility, and mechanical properties of the alloy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermochemical modelling and mechanical property of the Al-7.6Si-xZr alloy

Biswas

Das

et al. 2023

Materials Science and Technology

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“…Al-Si alloy with a silicon (Si) ratio of less than 12wt.% is called hypoeutectic Al alloys. This group of alloys is preferred in the automotive and marine industries due to their good fluidity, low thermal expansion coefficient, high corrosion resistance and high strength/weight ratio [4,5]. Also, the absence of coarse primary Si phases in hypoeutectic Al-Si alloys increases the desired machinability, castability and weldability of the alloy, which makes it suitable for the construction of automotive engines, crankcases, cylinder blocks and pistons.…”

Section: Introductionmentioning

confidence: 99%

Consolidation of Rapidly Solidifying Al-6Si-0.3Cu Alloy by Spark Plasma Sintering and Cold Compaction Methods

Yaşar,

Yılmaz

2022

IJMSIT

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In this study, Al-6Si-0.3Cu ribbon alloys produced by melt-spinning method were consolidated by two different methods, which are spark plasma sintering and cryogenic ball milling + cold compaction. From X-ray diffraction analysis, it was found that the solubility of Si in Al matrix in melt-spun alloys increased, but Si precipitated in SPS and ball milled+cold compacted alloys. Optical and scanning electron microscope observation revealed that while melt spun alloys have a very fine and homogenous microstructure, Si phase has become coarser in SPS and cold compacted alloys due to the sintering. The results showed that the spark plasma sintering method is a very effective method for compaction of melt-spun Al-6Si-0.3Cu alloy.

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“…Chemical modification of the molten liquid has been examined to hinder Si segregation, by the addition of Na [11,12] and P [13,14]. Likewise, chemical modification by rare earth elements microalloying have been studied for Ce [15,16], Sr [5,17], Y [18,19], La [20], Eu [21,22], Yb [23] and Nd [24]. Chemical modification often leads to thermodynamically favorable phases other than primary Silicon, thereby reducing the degree of Si segregation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cooling Rate on Nano-Eutectic Formation in Laser Surface Remelted and Rare Earth Modified Hypereutectic Al-20Si Alloys

et al. 2022

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Laser Surface Remelting (LSR) was applied to arc-melted Al-20Si-0.2Sr, Al-20Si-0.2Ce, and Al-20Si hypereutectic alloys to refine microstructures. Experiments revealed that microstructures in the melt pool varied from fully eutectic to a mixture of Al dendrites and inter-dendritic eutectic. We calculated cooling rates using the Eagar-Tsai model and correlated cooling rates with characteristic microstructures, revealing that a cooling rate on the order of 104 K/s could lead to maximized fully eutectic microstructure morphology. Due to rapid solidification, the Si composition in the LSR eutectic was measured at 18.2 wt.%, higher than the equilibrium eutectic composition of 12.6 wt.%Si. Compared to Al-20Si, Ce addition had no significant effect on the volume fraction of the fully eutectic structure but refined Si fibers to approximately 30 nm in diameter. Sr addition did not further refine the diameter of eutectic Si fibers compared to Al-20Si but increased the volume fraction of the fully eutectic microstructure morphology. The refinement ratio (φ) of the Si fiber diameter from the bottom of the melt pool to the surface for the three alloys was similar, at around 28%. The established correlation between the cooling rate and the size and morphology of the microstructure within the melt pool will enable tailoring of the microstructure in laser-processed as well as deposited alloys for high strength and plasticity.

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Modification Mechanism of Rare Earth Eu on Eutectic Si in Hypoeutectic Al-Si Alloy

Cited by 14 publications

References 40 publications

Thermochemical modelling and mechanical property of the Al-7.6Si-xZr alloy

Thermochemical modelling and mechanical property of the Al-7.6Si-xZr alloy

Consolidation of Rapidly Solidifying Al-6Si-0.3Cu Alloy by Spark Plasma Sintering and Cold Compaction Methods

Effect of Cooling Rate on Nano-Eutectic Formation in Laser Surface Remelted and Rare Earth Modified Hypereutectic Al-20Si Alloys

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