Semi-Solid Slurry Preparation without Additional Stirring, Cup-Cast Method

Pahlevani, Farshid; Yaokawa, J.; Anzai, Koichi

doi:10.4028/www.scientific.net/MSF.519-521.1835

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The Effect of Aging Processes on the Structure and Properties of Rapidly Solidified Al-Sc, Al-Zr and Al-Hf Alloys
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Solidification Structure and Casting Defect in a High-Speed Twin-Roll Cast A6022 Aluminium Alloy with Various Fe Contents
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Feeding Blockage of Aluminium Horizontal Continuous Casting
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Semi-Solid Slurry Preparation without Additional Stirring, Cup-Cast Method
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Structure Stabilization Al-(10-14)%Mg Alloys during the Long-Term Natural Ageing
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Grain Refinement Performance of Aluminium Cast-Alloy by Deformed Al-Al₃Ti Alloy Refiner
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HomeMaterials Science ForumAluminium Alloys 2006 - ICAA10Semi-Solid Slurry Preparation without Additional...

Semi-Solid Slurry Preparation without Additional Stirring, Cup-Cast Method

Abstract:

The needs for high-strength and lightweight structural materials have increased in automotive and aerospace structural applications. Semi-solid processed light alloys have satisfied these requirements because of processing advantages and significant weight reduction. Conventional semi-solid casting methods have got a wide variety of problems and difficulties. The cup-cast method that has been just developed is a novel process that make semi-solid casting as easy as pouring the water from a pitcher into a drinking glass, and avoid all the problem and difficulties of other semi-solid casting processes. Cup cast method is based on the heat and mass transfer and spherical equiaxed particles with controlling the nucleation and growth of solid particles were produced. In this study the different factor of this method was optimized by micro-structural investigation on the Al-A356 alloy. Pouring height and temperature, duration of pouring, and cup coating had played important roles in this method.

Info:

Periodical:

Materials Science Forum (Volumes 519-521)

Main Theme:

Aluminium Alloys 2006 - ICAA10

Edited by:

W.J. Poole, M.A. Wells and D.J. Lloyd

Pages:

1835-1840

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.1835

Citation:

F. Pahlevani et al., "Semi-Solid Slurry Preparation without Additional Stirring, Cup-Cast Method", Materials Science Forum, Vols. 519-521, pp. 1835-1840, 2006

Online since:

July 2006

Authors:

Farshid Pahlevani, J. Yaokawa, Koichi Anzai

Keywords:

Aluminum (Al), Cup-Cast Method, Microstructure, Rheo-Casting, Semi-Solid Casting, Thixocasting

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Paper TitlePages

Slurry Preparation and Hot Tearing Susceptibility of A201 Aluminum Alloy in Rheological Die Casting

Authors: Jun Zhen Gao, Qiang Zhu, Da Quan Li, Xiao Gang Hu, Min Luo, Yong Lin Kang

Abstract: A201 alloy is the strongest cast aluminum alloy, but it is considered one of the most difficult aluminum alloys to cast due to its susceptibility to hot tearing during solidification. Semi-solid casting, which characterizes fine near-globular or non-dendritic grains and relatively narrow solidification range, is potential to reduce hot cracking tendency of alloys. In this present work, semi-solid slurries of A201 alloy were prepared using Swirled Enthalpy Equilibrium Device (SEED) technique and then injected into a self-designed high pressure hot tearing mold. The microstructures of A201 semi-solid slurries with different pouring temperatures were examined. Effects of different casting pressures on the hot tearing sensitivity of A201 have been investigated. This study finds that SEED is capable of producing satisfying A201 semi-solid slurries. Lower pouring temperatures produce A201 semi-solid slurries with finer and rounder grains as well as more uniform microstructure distribution. Increasing the intensification pressure significantly decreases the hot treating tendency of A201 alloy. When the pressure reaches to 90 MPa and the mold temperature of about 250 °C, the hot tearing susceptibility (HTS) index value is nearly zero, which means almost no surface cracks are found in the semi-solid A201 die casting parts.

311

Semi-Solid Casting of Pure Magnesium

Authors: Ulyate Andries Curle, Jeremias D. Wilkins

Abstract: Semi-solid processing works on the principal of a solidification temperature interval of a substance. The substance is heated to a temperature within this interval so that there exists a related solid-liquid fraction ratio. The substance with this phase structure is then shaped by a forging or casting process. It has been stated before that it is impossible to semi-solid process and cast pure metals or eutectic alloys due to their thermodynamic temperature invariance, meaning that there is no temperature interval. It was demonstrated recently that it is possible to semi-solid casting high purity aluminium (Curle UA, Möller H, Wilkins JD. Scripta Materialia 64 (2011) 479-482) and the Al-Si binary eutectic (Curle UA, Möller H, Wilkins JD. Materials Letters 65 (2011) 1469-1472). The working principal is that there exists a time interval during thermal arrest during which solidification takes place with a solid-liquid fraction ratio until all the liquid is consumed upon cooling. The aim with this work is to demonstrate that pure magnesium can also be rheo-high pressure die cast (R-HPDC) with the system developed at the CSIR in South Africa. Magnesium is notoriously difficult to cast due to the thermal properties of magnesium. The metal was poured into a cup, processed for about 6 seconds after which it was HPDC into a plate. The microstructure of the casting consists of a structure that was solid and a structure that was liquid during thermal arrest at the time of casting.

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