Evaluation of solid fraction in a rheocast aluminum die casting alloy by a rapid quenching method

Wannasin, Jessada; Canyook, Rungsinee; Burapa, R.; Sikong, Lek; Flemings, M. C.

doi:10.1016/j.scriptamat.2008.07.029

Cited by 56 publications

(17 citation statements)

References 9 publications

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“…In order to overcome this drawback, Wannasin et al [21] used a segregation sensitive reagent (Weck's reagent) to etch the rapidly quenched Al-Si-Cu-Fe aluminum alloy (JIS ADC 10) and showed different color between pre-existing a-Al grain and growth layer formed during quenching, therefore, the growth layers could be excluded when measuring solid fraction via quantitative metallography. However, they just measured a very limited range of solid fraction (from 0 % to about 20 %), and detailed explanation of the growth layer's different color was not given in their paper.…”

Section: Evaluation Of Solid Fractionmentioning

confidence: 99%

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

2012

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Spheroidization of Al grains is required for the production of semi-solid slurry either by a partial solidification route or partial re-melting route. In this research, A356 aluminum alloy was deformed and partially re-melted to semi-solid state. A segregation sensitive reagent (Weck's reagent) was used to reveal the inner microstructure of Al grains for the better understanding of the microstructure evolution during partial re-melting. Optical microstructure observation showed that the previously compressed Al dendrites were actually ''fractured'' during heat treatment and such ''fractured'' dendrites contributed to the refinement and spheroidization of Al grains. Further study of this phenomenon indicates that the ''fractures'' are actually migrating high-angle grain boundaries, which was related to the recrystallization that occurred during heat treatment. Moreover, the growth layer of Al grains formed during water quenching is clearly visualized after being etched by Weck's reagent. Consequently, precise evaluation of solid fractions through image analysis was realized by excluding growth layer when measuring the area of solid phase.

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Section: Evaluation Of Solid Fractionmentioning

confidence: 99%

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

2012

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“…It has been reported that the semisolid slurries controlled by above rheological parameters are very critical in RDC process. Wannasin et al 5 studied the effect of solid fraction in the RDC alloys and reported that the apparent viscosity of the sheared semisolid slurries increases with increase in volume fraction solid and cooling rate, while it decreased with an increase in shear rate. They also concluded that the RDC alloy showed higher amounts of dendritic grains in the matrix at higher cooling rates.…”

Section: Microstructural Examinationmentioning

confidence: 99%

“…However, the applications of both gravity die-casting and high pressure die-casting aluminum alloys in high quality and integrity of components in automotive and aerospace sectors have been restricted due to their poor quality resulting from harmful gas entrapment in the solidified metal as well as the presence of large amounts of micro-porosity 3,4 . In recent years, rheological forming of semisolid metal such as Rheo-casting, Thixo-casting and Stir-casting of aluminum alloys have received wide attention in producing aluminum alloy castings with enhanced mechanical properties compared to conventional die casting processes [5][6][7] . In particular, the Rheo-Die-Casting (RDC) process is of significance in producing complex shape industrial components having high quality, high integrity and improved performance [6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

Rheo-Die-Casting of Al-Si-Mg Alloy and Al-Si-Mg/ SiCp Composites: Microstructure and Wear Behavior

Padmanaban¹,

Subramanian

Anburaj

et al. 2020

Mat. Res.

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In this paper, Rheo-Die Cast (RDC) Al-Si alloy with 7.5 wt % Si and 0.3 wt %Mg and Metal Matrix Composites (MMC's) of RDC Al-Si composites with 5 to 20 vol. % of SiC p were produced by an in-house fabricated RDC machine. Microstructure and wear behavior of both RDC alloy and composites were investigated. Results indicated that the RDC samples have significantly refined microstructure with fine and uniform non-dendritic grains resulting increased hardness and enhanced wear resistance. Wear resistance is three times higher for sample with 20% SiC p than those without SiC p additions. Surfaces of wear test samples were investigated by SEM to study the effect of both grain structure and SiC p particulates on the wear mechanism. It was also observed that reinforced RDC samples showed improved hardness and wear resistance due to the presence of SiC p in the matrix of non-dendritic grains, obtained without modification treatment.

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“…Generally, SSP is categorized into two routes: rheoforming, in which the alloy is controlled cooling to the semi-solid state and then injected into a die without an intermediate solidification step, and thixoforming, which involves reheating of solid billets to a semi-solid temperature range and followed by forming operation. Over the past two decades, an obvious trend can be found that rheoforming has been the subject of extensive study due to many merits, such as its lower cost and shorter process [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Current Progress in Rheoforming of Wrought Aluminum Alloys: A Review

Gan

et al. 2020

Metals

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Semi-solid processing (SSP), including rheoforming and thixoforming, offers a promising opportunity to manufacture net-shaped parts with complex structure and excellent mechanical properties. Owing to its low cost and short process, rheoforming has been the subject of extensive study over the last two decades. The interest in the rheoforming of wrought aluminum alloys is progressively growing among both the research and industrial communities. This review starts with reviewing the recent efforts and advances on preparation of semi-solid slurry of wrought Al alloys, followed by discussing the correlation between microstructure and performance of these alloys. Finally, special attention is paid in the industrial application and the future trends of rheoforming of wrought aluminum alloys.

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Evaluation of solid fraction in a rheocast aluminum die casting alloy by a rapid quenching method

Cited by 56 publications

References 9 publications

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

Analysis of microstructure evolution and precise solid fraction evaluation of A356 aluminum alloy during partial re-melting by a color etching method

Rheo-Die-Casting of Al-Si-Mg Alloy and Al-Si-Mg/ SiCp Composites: Microstructure and Wear Behavior

Current Progress in Rheoforming of Wrought Aluminum Alloys: A Review

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