Characteristics of defect bands and their formation mechanisms in A356 wheel fabricated by horizontal squeeze casting

Huang, Xiu; He, Liang; Mi, Guangbao; Li, P. J.

doi:10.1179/1743284714y.0000000542

Cited by 9 publications

(5 citation statements)

References 28 publications

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“…That is to say, unlike the previously reported defect bands in HPDC AZ91D alloy [9,19] , the defect band in die cast AE44 alloy is not a porosity band, but a band with conspicuously heterogeneous microstructure. It is worth noting that double defect bands are commonly observed in the cross section of die cast samples [12,13] . They share the same form and only differ in width, location and grain characteristics.…”

Section: Typical Morphology and Solute Distribution Of Defect Bandmentioning

confidence: 99%

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Defect band formation in high pressure die casting AE44 magnesium alloy

Hou

Huang

et al. 2022

China Foundry

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The characteristics of defect bands in the microstructure of high pressure die casting (HPDC) AE44 magnesium alloy were investigated. Special attention was paid to the effects of process parameters during the HPDC process and casting structure on the distribution of defect bands. Results show that the defect bands are solute segregation bands with the enrichment of Al, Ce and La elements, which are basically in the form of Al 11 RE 3 phase. There is no obvious aggregation of porosities in the defect bands. The width of the inner defect band is 4-8 times larger than that of the outer one. The variation trends of the distribution of the inner and outer defect bands are not consistent under different process parameters and at different locations of castings. This is due to the discrepancy between the formation mechanisms of double defect bands. The filling and solidification behavior of the melt near the chilling layer is very complicated, which finally leads to a fluctuation of the width and location of the outer defect band. By affecting the content and aggregation degree of externally solidified crystals (ESCs) in the cross section of die castings, the process parameters and casting structure have a great influence on the distribution of the inner defect band.

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Section: Typical Morphology and Solute Distribution Of Defect Bandmentioning

confidence: 99%

“…With an thickness of several grains, it is detrimental to the mechanical properties of die cast components. Therefore, it has aroused widespread attention of researchers [9][10][11][12][13][14][15] . The defect band is essentially a solute segregation band generally with the aggregation of shrinkage pores.…”

Section: Introductionmentioning

confidence: 99%

Defect band formation in high pressure die casting AE44 magnesium alloy

Hou

Huang

et al. 2022

China Foundry

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“…Jiao et al [4] found a typical heterogeneous microstructure of high-pressure die-casting Al-10 wt.%Si alloy comprised α-Al rich region, eutectic silicon band region and porosity. Huang et al [5] studied the characteristics of defect bands at different locations of an A356 wheel fabricated by horizontal squeeze casting and observed three types of defect bands including skin-related band, the dilatant band and the separate band. Feng et al [6] analyzed the relationship between segregation, microstructure, and mechanical properties of semisolid die casting Al-6Si-3Cu-0.4Mg alloy.…”

Section: Introductionmentioning

confidence: 99%

Effect of Intensification Pressure on Eutectic Si Segregation of Al-12Si-1Cu Alloy in Squeeze Casting

Zhang

Chen

et al. 2023

J. Phys.: Conf. Ser.

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Squeeze casting is an advanced technology to produce aluminum alloy components with excellent mechanical property. Due to good fluidity and castability, the Al-Si alloy is the most common aluminum material in squeeze casting. However, the segregation in solid α-Al phase and liquid eutectic Si phase happens during solidification, which leads to microstructural inhomogeneous in the final microstructure. In this study, the eutectic Si segregation of Al-12Si-1Cu alloy under different intensification pressure in squeeze casting was investigated by Optical Microscopy (OM). The results show that increasing intensification pressure promotes the eutectic Si segregation at center zone, while the eutectic Si phase at skin zone is not much influenced. Increasing the intensification pressure from 65 MPa to 140 MPa, the segregation degree of eutectic Si at center zone increases from 0.05 to 0.29, while the segregation degree at skin zone levels at 0.2. Under high intensification pressure, the feeding effect of liquid phase at center zone is prominent, which results to high tendency of eutectic Si segregation in the final microstructure.

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“…The mechanical performance depends sensitively on the microstructure and casting defects, which are controlled by casting methods [5,6]. Die casting, in which molten metal solidifies under high pressure, is widely employed in the manufacture of components with the advantages of no porosity, high mechanical properties, good surface smoothness, and accurate dimensional precision [7,8,9]. In the conventional die casting process, porosities are caused by gas entrapment resulted from the high-speed filling of the liquid metal.…”

Section: Introductionmentioning

confidence: 99%

Effects of Solidification Pressure and Heat Treatment on the Microstructure and Micro-Hardness of AlSi9CuMg Alloy

et al. 2019

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The effect of high pressure (135 MPa) and the following heat treatment on the microstructure and micro-hardness of the squeezing cast AlSi9CuMg alloy is investigated, using optical microscopy (OM), Vickers tester, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The results indicate that the application of high pressure can increase under-cooling and the cooling rate during solidification and cause the refinement of the microstructure. The enhanced melt flow resulting from high pressure can also break the dendrite to form the spherical and elliptical primary α (Al) grains during the early stage of solidification. The winter-sweet flower-shaped primary α (Al) phases can also be formed through plastic deformation caused by the flow of the partially solidified melt. The ageing treatment results showed that a maximum (peak) micro-hardness value was obtained for each of the three ageing temperatures at different ageing times, and the highest peak value was achieved at 175 °C for 480 min. The micro-hardness change of the sample under different ageing processes was attributed to the variation of type, density, and size of the precipitates.

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Characteristics of defect bands and their formation mechanisms in A356 wheel fabricated by horizontal squeeze casting

Cited by 9 publications

References 28 publications

Defect band formation in high pressure die casting AE44 magnesium alloy

Defect band formation in high pressure die casting AE44 magnesium alloy

Effect of Intensification Pressure on Eutectic Si Segregation of Al-12Si-1Cu Alloy in Squeeze Casting

Effects of Solidification Pressure and Heat Treatment on the Microstructure and Micro-Hardness of AlSi9CuMg Alloy

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