Effect of strontium and melt purification on the solidification microstructure of hypereutectic Al-Si alloys

Chen, Wenyao; Liu, Ya; Peng, Haoping; Wang, Jianhua; Su, X.P.

doi:10.1016/j.mtcomm.2022.105310

Cited by 3 publications

(5 citation statements)

References 15 publications

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“…The analysis results (Figure 8a,b) reveal that the melt-quenched alloy displays irregular angular black compound particles. The combined results of this energy spectrum analysis and reports from the literature [21] show that the black compound particles are present in the Al 2 Si 2 Sr phase. With increasing strontium content, the structure of the black compounds remains unchanged, and the particle size in the Al 2 Si 2 Sr phase increases.…”

Section: Effect Of Strontium and Melt Quenching On Solidified Structu...supporting

confidence: 57%

“…The high undercooling process effectively inhibits the nucleation of primary Si and reduces the number of primary Si particles in the solidification microstructure of the alloy. Owing to the small number of primary Si particles, the high silicon content in the surrounding alloy melt could provide abundant Si atoms to promote the coarsening of primary Si particles, thereby significantly increasing their sizes [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

“…Then, small ingots were prepared by pouring the melt into room temperature metal molds. Specific experimental methods can be found in reference [ 21 ]. The melt quenching casting device comprises a bracket and a copper tube as shown in Figure 1 .…”

Section: Experimental Preparation and Methodsmentioning

confidence: 99%

“…The metallographic specimens were prepared according to reference [ 21 ]. Keller reagent (95 mL H 2 O, 2.5 mL HNO 3 , 1.5 mL HCl, 1.0 mL HF) was used for corrosion.…”

Section: Experimental Preparation and Methodsmentioning

confidence: 99%

“…The solidified structures of 1/8R, 1/4R, 1/2R and R from the edge of the alloy round bar samples were observed using a Leica DMI 3000 metallographic microscope. The instrument operating parameters used in this experiment were the same as in the literature [ 21 ], and the primary Si and α-Al phases of the alloy were quantitatively analyzed using an Image-Pro Plus 6.0 software. The alloy phases were analyzed using a Smartlab X-ray diffractometer, and the microstructure and composition of the alloy specimen were examined using a JSM-6360LV scanning electron microscope.…”

Section: Experimental Preparation and Methodsmentioning

confidence: 99%

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Synergistic Effect of Strontium and Melt Quenching on the Solidification Microstructure of Hypereutectic Al-Si Alloys

Wang,

Chen,

Liu

et al. 2023

Materials

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The synergistic effect between strontium (Sr) and melt quenching on the solidified microstructure of hypereutectic Al-Si alloys was investigated by optical and scanning electron microscopy. The results indicate that melt quenching can suppress the growth of primary Si particles in the solidified structure of the hypereutectic Al-Si alloy, resulting in a significant decrease of in the average size of primary Si particles in Al-(18~22)Si alloys from 30.35~66.31 μm to 15.13~34.63 μm. The synergistic effect between Sr and melt quenching can further inhibit the precipitation of primary Si particles in the Al-18Si alloy. After the addition of Sr to Al-18Si alloy and undergoing melt quenching, the area fraction of primary Si clearly decreases. When the added amount of Sr increases from 0.1 wt.% to 0.5 wt.%, the area fraction of primary Si decreases from 1.13% to 0.16%. With 0.5 wt.% Sr in the tested alloy, the inhibiting effect on primary Si precipitation was significantly improved. Research has shown that the cooling rate has a significant impact on the solidified structure of the melt-quenched Al-18Si-0.5Sr alloy. There exists no primary Si in solidified structures on the area of 1/8R and 1/4R from the surface of the round bar sample, but the area fraction of primary Si increases, respectively, to 1.97% and 12.48% on the area of 1/2R and R from the surface. The higher the cooling rate, the higher the inhibitory effect on the primary Si precipitation in the Al-18Si-0.5Sr alloy.

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Section: Effect Of Strontium and Melt Quenching On Solidified Structu...supporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Preparation and Methodsmentioning

confidence: 99%

“…The metallographic specimens were prepared according to reference [ 21 ]. Keller reagent (95 mL H 2 O, 2.5 mL HNO 3 , 1.5 mL HCl, 1.0 mL HF) was used for corrosion.…”

Section: Experimental Preparation and Methodsmentioning

confidence: 99%

Section: Experimental Preparation and Methodsmentioning

confidence: 99%

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