AlSi2Sc2 intermetallic formation in Al-7Si-0.3Mg-xSc alloys and their effects on as-cast properties

Pandee, Phromphong; Gourlay, C.M.; Belyakov, S. A.; Patakham, Ussadawut; Zeng, Guang; Limmaneevichitr, Chaowalit

doi:10.1016/j.jallcom.2017.10.125

Cited by 41 publications

(12 citation statements)

References 35 publications

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“…The aluminum-10 wt.% silicon eutectic alloy owns dendritic microstructure in the as-cast state, Figure 1a. The typical A356 alloy consists of α-aluminum phase and the eutectic phase which is similar with the experimental alloy [10]. The dendrite structure contains aluminum (61.1 at.%) and silicon (38 at.%) marked as 1.…”

Section: Resultssupporting

confidence: 77%

“…One of the melt treatments is grain refinement, which could promote fine equiaxed αaluminum grain structure and homogeneous casting microstructures. This melt treatment could also refine the distribution of secondary phases and microporosity, thereby resulting in several benefits such as higher yield strength and toughness, improved machinability, strong resistance to hot tearing and good surface finish quality [10][11]. The hypoeutectic aluminum-silicon alloy was prepared by semi-solid casting and equal channel angular pressing (ECAP) process, the grains and secondary phases were refined.…”

Section: Introductionmentioning

confidence: 99%

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Microstructures and corrosion resistance of as‐cast aluminum‐10 wt.% silicon and aluminum‐20 wt.% silicon alloys

Zhao

Yin

Liu

et al. 2019

Materialwissenschaft Werkst

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The microstructures and corrosion resistance of two as‐cast alloys, aluminum‐10 wt.% silicon hypoeutectic alloy and aluminum‐20 wt.% silicon (weight percent) hypereutectic alloy are investigated by conventional casting, the scanning electron microscope equipped with oxford X‐ray energy dispersive spectroscopy system and transmission electron microscope are applied for analysis. The results show that the microstructures change from the strip‐like into lump shape with the increase of silicon content from 10 % to 20 %. The electrochemical polarization curves prove that the aluminum‐20 wt.% hypereutectic silicon alloy had the better resistance with the corrosion potential of −1.414 V and corrosion current density of 5.41 ⋅ 10−5 ampere compared with the aluminum‐10 wt.% silicon hypoeutectic alloy.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Microstructures and corrosion resistance of as‐cast aluminum‐10 wt.% silicon and aluminum‐20 wt.% silicon alloys

Zhao

Yin

Liu

et al. 2019

Materialwissenschaft Werkst

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“…The stable Al-Si-Ce intermetallic phase is allowed to form in the reaction L→Al+AlCeSi 2 +Si at 568.7 °C [30]. Similar to the formation of Al-Si-Ce phases, the formation of AlSi 2 Sc 2 [31] and Al 2 Si 2 Yb [32] phases was observed within the eutectic Si. This additional Al-Si-Ce phase in the eutectic, which alters solute rejection at the solid/liquid front, possibly affects the eutectic Si morphology.…”

Section: Refinement Mechanism Of Primary and Eutectic Simentioning

confidence: 81%

Primary Si refinement and eutectic Si modification in Al-20Si via P-Ce addition

Chokemorh

Pandee

Chankitmunkong

et al. 2022

Mater. Res. Express

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Enhancing the mechanical properties of hypereutectic Al-Si alloys by refining the primary and eutectic Si morphology is very challenging. In this study, the refinement mechanism of primary and eutectic Si morphologies via the simultaneous addition of P-Ce into the Al-20Si alloy was studied. Microstructural analysis revealed that the primary and eutectic Si morphologies were significantly refined, which increased the tensile strength. Furthermore, the addition of Ce, up to 0.6 wt%, can result in the formation of Ce-rich intermetallic phases, which may lead to a significantly increased tensile strength while retaining the ductility of the alloy. The ultimate tensile strength of the Al-20Si alloy increased from 96 to 175 MPa, and the elongation increased from 1.0% to 1.7% with the addition of P-Ce. Moreover, the wear resistance of the alloy improved. The added P and Ce did not react with each other to form an intermetallic compound; therefore, this method can simultaneously refine primary and eutectic Si.

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“…Most of the eutectic silicon was further converted into smaller particles when subjected to T6 heat treatment. Pandee et al [13] showed that the α-Al primary phase was refined after the addition of Sc; this is because the precipitate of Al3Sc can be used as heterogeneous nucleation point. Nevertheless, its effect on eutectic Si morphology is much weaker.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ce Addition and Heat Treatment on Microstructure Evolution and Tensile Properties of Industrial A357 Cast Alloy

Wang

Liu

Zheng

et al. 2020

Metals

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The effects of adding different Ce contents (0–0.32 wt.%) on the microstructure, mechanical properties, and fracture morphology of industrial A357 cast alloy in as-cast and T6 heat treatment were studied. The main purpose of this study is to improve the microstructure stability and tensile properties of industrial A357 cast alloy. The microstructural analyses indicate that the addition of Ce causes refinement of the α-Al primary phase for the reason that the formation of intermetallic compounds containing (AlSiCeMg) elements enriches the front of the solid–liquid interface, which causes an increase in constitutional undercooling. Simultaneously, the addition of Ce also affected the characteristics of eutectic Si particles, which make its morphology change from acicular structures into fragmented and spheroidized. This is mainly due to the formation of Ce-rich precipitates during solidification, which increase the constitutional undercooling and suppress the nucleation of the eutectic Si particles, resulting in the change of eutectic Si characteristics. Moreover, the needle-like morphology of a Fe-containing intermetallic is transformed into α(AlSiFeCe) phase containing rare earth Ce when part of the Ce atoms entered β(Al5FeSi) phase compounds. The tensile properties of the modified alloys were improved in the as-cast and T6 heat treatment as a consequence of simultaneous refinement of both secondary dendrite arm spacing and grains and the improvement of eutectic Si particles and Fe-containing intermetallic morphology. The fracture surface of the modified alloy has more dimples than the unmodified alloy, which indicates that the main fracture pattern of the modified alloy is dimple fracture caused by the crack of eutectic Si particles. The optimal percentage of Ce in industrial A357 cast alloy was determined to be 0.16 wt.% according to the change of microstructures structure and mechanical properties. These experimental results provide a new basis for adding rare earth Ce to improve the performance of parts in the actual production of industrial A357 cast alloy.

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AlSi2Sc2 intermetallic formation in Al-7Si-0.3Mg-xSc alloys and their effects on as-cast properties

Cited by 41 publications

References 35 publications

Microstructures and corrosion resistance of as‐cast aluminum‐10 wt.% silicon and aluminum‐20 wt.% silicon alloys

Microstructures and corrosion resistance of as‐cast aluminum‐10 wt.% silicon and aluminum‐20 wt.% silicon alloys

Primary Si refinement and eutectic Si modification in Al-20Si via P-Ce addition

Effect of Ce Addition and Heat Treatment on Microstructure Evolution and Tensile Properties of Industrial A357 Cast Alloy

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