Investigation of rheo-diecasting mold filling of semi-solid A380 aluminum alloy slurry

Liu, Zhiyong; Mao, Weimin; Wang, Weipan; Zheng, Zhi-kai; Yue, Rongcai

doi:10.1007/s12613-017-1452-z

Cited by 16 publications

(4 citation statements)

References 19 publications

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“…The growth of the dendrites is effectively inhibited by the increase of the primary α(Al) nuclei. On the other hand, the stirring occurs when the alloy slurry flows through the closed and curved serpentine channel, and the direction of the alloy slurry changes several times with the effects of gravity; in this way, the movement at decreased viscosity of the formed slurry has the function of self-stirring [21][22][23].…”

Section: Recent Developments In Slurry Formingmentioning

confidence: 99%

Semi-Solid Slurries for Rheocasting of Hypoeutectic Al-Si-X Alloys Produced by Self-Stirring in Serpentine Channels

Alfredo,

José Federico,

Aldo

et al. 2024

Metals

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Nowadays it is common to see the production of complex and critical automotive and aeronautical components reduced in weight for energy efficiency using light alloys with improved microstructural and mechanical properties. The casting processes involved in this trend are strong; in this study, an optimized design of a vertical serpentine channel and a novel design of a horizontal serpentine channel to produce semi-solid slurry (S2S) with thixotropic behavior by self-stirring for rheocasting of A380 and A356 alloys are tested. Simultaneously, chilling during solidification, flow development, and shearing on the alloys to improve the performance of solid fractions and self-stirring at high shear rate are applied. The effects of these conditions on the modification of the morphology transition of the α(Al) phase from dendrite to equiaxed grain are discussed. The results suggest the ability of the mentioned processes to promote the morphological transition of the primary solid due to the produced equiaxed grains of α(Al) phase having sizes between 25–50 µm from A380 alloy processed by vertical self-stirring. On the other hand, the treatment of the A356 alloy using the new horizontal serpentine channel produces equiaxed grains with an average size of 39 µm. Unexpected Si crystals, trapped in the α(Al) phase using both methods with both alloys, are detected. The applied operation parameters were aided by gravity-pouring close to the liquidus temperature, and the obtained microstructural results show the ability for S2S to form alongside thixotropic behavior and non-dendritic solidification by mean of self-stirring in the serpentine channels, suggesting the potential for further experiments under die-casting conditions.

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Section: Recent Developments In Slurry Formingmentioning

confidence: 99%

Semi-Solid Slurries for Rheocasting of Hypoeutectic Al-Si-X Alloys Produced by Self-Stirring in Serpentine Channels

Alfredo,

José Federico,

Aldo

et al. 2024

Metals

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“…From conventional optical metallography images obtained from heat-treated samples, dendritic cell size (DCS) analyses were performed using Heyn's intercept method as described by ASTM E112 as well as the shape factor (SF) analyses according to Eq. [1]. With the polarized light micrographs, it was possible to measure the grain size (GS), also using Heyn's intercept method.…”

Section: A Metallographic Characterizationmentioning

confidence: 99%

“…Recent works have also sought to understand the behavior of this material in thixoforming and rheocasting processes. [1][2][3][4] This alloy is mainly composed of Al, Si, Cu, Fe and Zn, which ensures this material has a complex microstructure, composed mainly by dendritic a-Al structures, eutectic structures as well as intermetallic ones such as b-iron, a-iron and h-Cu phases. [3] Currently, there are several ways to obtain microstructures suitable for thixoforming in aluminum alloys.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Strontium on Microstructural and Rheological Behavior of the Semi-solid A380 Aluminum Alloy

Ferreira

Lourençato

Roca

et al. 2020

Metall Mater Trans A

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This article aims to correct the lack of information regarding the combined effect of grain refinement and strontium modification on the microstructure and rheological behavior of semi-solid slurries. The A380 aluminum alloy was studied in the semi-solid state in three different conditions: as received, grain refined and grain refined/modified with Sr. To determine the semi-solid temperature, a DSC analysis and Thermo-calcÒ simulations were used. SEM, optical and polarized light microscopy analyses were performed to analyze the microstructural changes caused by the refiner and modifier agents as well as to evaluate the morphological evolution of the alloys in the semi-solid state. The rheological behavior was studied with a hot compression test between parallel plates. The main results show that the addition of Sr, besides its influence on the Si and Fe-b particles, also leads to a better globularization of a-Al phase particles in the semi-solid state. Furthermore, the rheological analysis of stress vs strain and apparent viscosity vs average shear rate also point to a better behavior of the alloy in the semi-solid state after Sr modification, thus indicating that Sr addition could improve the performance of the A380 alloy as a semi-solid feedstock.

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“…and serpentine channel [3,10] were used to generate the semisolid slurry with nearly spherical primary Al phase.…”

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confidence: 99%

Microstructure evolution of A380 aluminum alloy during rheological process under applied pressure

Wang

Xing

et al. 2019

China Foundry

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S queeze casting can be supposed as a combination of casting and forging [1, 2]. In this process, high pressure is applied to the melt during solidification to obtain fine grains. The essence of mold-filling and feeding is rheological solidification of the alloy melt under pressure. Microstructure evolution is inevitable in this process, which affects the mold-filling and feeding in turn. Therefore, research on microstructure evolution during the rheological process under applied pressure is extremely meaningful. A great deal of scientific research has been done on the mechanism of microstructure evolution [3-10]. The basic methods of refining microstructure are: controlling nucleation, inhibiting dendrites growth, and prompting the initial solidification nucleation [3]. Based on these ideas, various techniques, such as mechanical stirring [4] , electromagnetic stirring [5] , strain induced melt activation [6] , casting using a cooling slope [7-9]

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Investigation of rheo-diecasting mold filling of semi-solid A380 aluminum alloy slurry

Cited by 16 publications

References 19 publications

Semi-Solid Slurries for Rheocasting of Hypoeutectic Al-Si-X Alloys Produced by Self-Stirring in Serpentine Channels

Semi-Solid Slurries for Rheocasting of Hypoeutectic Al-Si-X Alloys Produced by Self-Stirring in Serpentine Channels

The Influence of Strontium on Microstructural and Rheological Behavior of the Semi-solid A380 Aluminum Alloy

Microstructure evolution of A380 aluminum alloy during rheological process under applied pressure

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