Characterization of flow behavior of semi-solid slurries containing low solid fractions in high-pressure die casting

Janudom, Somjai; Wannasin, Jessada; Basem, J.; Wisutmethangoon, Sirikul

doi:10.1016/j.actamat.2013.07.010

Cited by 47 publications

(21 citation statements)

References 13 publications

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“…The slurry of AM60 alloy contains refined and irregular α-Mg particles produced with the self-inoculation pouring method, which evolves to a globular and coarse texture when continuously keeping the slurry in semisolid state at 595 °C; (2). The microstructure of the SIRD AM60 sample was dominated by fine primary α-Mg globules and less tiny dendrites in liquid matrix while the sample from conventional liquid die casting presents as porous dendrites; (3).…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Rheo-diecasting (RD), an alternative semisolid forming technology for shaping complex thin-wall parts with high integrity, has been attracting considerable interest during the past several years [1][2][3]. Because the starting material contains a certain fraction of a solid phase, the die filling process in RD presents as laminar, so the porosity can be readily reduced, thus the components can be further strengthened by heat treatment [4].…”

Section: Introductionmentioning

confidence: 99%

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Rheo-Cast Microstructure and Mechanical Properties of AM60 Alloy Produced by Self-Inoculation Rheo-Diecasting Process

Xing

Feng

et al. 2016

Metals

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Rheo-forming is becoming the choice for production of high quality parts with diminished defects and fine integrity. In this paper, the novel self-inoculation rheo-diecasting (SIRD) process, in which semisolid slurry is produced by mixing two precursory solid and liquid alloys and subsequently pouring them through a multi-stream fluid director, has been proposed. Microstructural characteristics of AM60 alloy slurry and the microstructure and mechanical properties of rheo-diecasting AM60 samples were investigated. Quenching experiments reveal that the slurry microstructure of AM60 was well refined to irregular α-Mg particles with the average size of approximately 20-40 µm after pouring with the self-inoculation process, and these particles were evolved to globular and coarse morphology while continuously keeping in semisolid state. After rheo-diecasting, the microstructure of the sample was dominated by fine primary α-Mg globules accompanied with tiny secondary α-Mg particles while the sample from conventional liquid die casting was characterized by developed dendrite and porosity. Microscopic analysis indicates that there are three stages of remaining liquid solidification in die cavity in SIRD: α-Mg nucleation and growth on primary α-Mg surface, α-Mg nucleated independently in liquid, and, finally, formation of skeleton devoiced eutectic. Due to diminished porosity and hot tearing, tensile strength and elongation of SIRD samples were increased by 12.9% and 35.3%, respectively, compared to a conventional liquid die casting sample.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rheo-Cast Microstructure and Mechanical Properties of AM60 Alloy Produced by Self-Inoculation Rheo-Diecasting Process

Xing

Feng

et al. 2016

Metals

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“…This is because of the lower gas concentrations that exist after solution heat treatments, which inhibits gas-induced blisters. 4,11) Despite this advantage, the application of semisolid die casting to the commercial manufacturing scale has yet to be established and has been investigated only on an experimental level.…”

Section: Introductionmentioning

confidence: 99%

“…1,2) For higher productivity and economic feasibility, high-pressure die casting (HPDC) for lightweight vehicles and electronics has been widely used. 3,4) However, in general it is difficult to conduct a commercial scale heat treatment process during HPDC because of the occurrence of inner defects, such as porosity, as gases become trapped during the high-speed filling of the mold with molten metal. A porosity increase in the HPDC process up to 1,000 times can be observed when solution heat treatment is applied.…”

Section: Introductionmentioning

confidence: 99%

Effect of Casting Parameters on the Microstructure and Mechanical Properties of ADC10 Alloys Using a Semisolid Die Casting and Heat Treating Process

Kang

Hong

Jang³

et al. 2016

Mater. Trans.

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The effect of casting parameters on the microstructure and mechanical properties during semisolid die casting using commercial ADC10 alloys was studied. Fine and uniform globular microstructures were produced using optimized casting conditions, where low pouring temperatures of 878 K (605°C) and pre-heating of the slurry-making container temperatures up to 523 K (250°C) resulted in better microstructural control. To obtain the conditions for high quality slurries within a mass production system, the microstructural characteristics of slurries produced with various cooling rates were analyzed. Cooling rates between 0.1°C/s and 0.9°C/s were found to result in comparatively good microstructural characteristics, which corresponded to form factors of 0.75 or greater and ¡-Al particles less than 65 µm in the slurries. The hardness and tensile strength were evaluated for T6 heat-treated semisolid die cast products and compared with the properties of high-pressure die cast specimens. Transmission electron microcopy (TEM) and electron probe micro-analysis (EMPA) were also used to identify and verify the precipitated secondary phases and the solute distribution.

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Effects of ultrasonic treatment on microstructure and mechanical properties of semisolid Sn-52Bi alloy

Zheng

2016

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Characterization of flow behavior of semi-solid slurries containing low solid fractions in high-pressure die casting

Cited by 47 publications

References 13 publications

Rheo-Cast Microstructure and Mechanical Properties of AM60 Alloy Produced by Self-Inoculation Rheo-Diecasting Process

Rheo-Cast Microstructure and Mechanical Properties of AM60 Alloy Produced by Self-Inoculation Rheo-Diecasting Process

Effect of Casting Parameters on the Microstructure and Mechanical Properties of ADC10 Alloys Using a Semisolid Die Casting and Heat Treating Process

Effects of ultrasonic treatment on microstructure and mechanical properties of semisolid Sn-52Bi alloy

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