Pressure-driven mold filling model of aluminum alloy melt/semi-solid slurry based on rheological behavior

The apparent viscosity and rheological behavior of nanoSiCP/Al-5Cu composites were studied by using a high temperature coaxial rotating cylinder viscometer. The results show that mass fraction of nanoSiCP is an important factor for apparent viscosity of the nanoSiCP/Al-5Cu composites, and there is a great enhancement of apparent viscosity of the slurry with the increase of nanoSiCp content. It can attribute to the viscous force between nanoSiCp and matrix alloy melt above the liquidus. The increased amplitude of apparent viscosity in semi-solid state is far less than those in liquid state with the increase of mass fraction of nanoSiCp. The apparent viscosities of the composites reinforced with 0.5%, 1%, 1.5% and 2% nanoSiCp at 700°C were 24.78%, 95.25%, 160.29% and 228.62% higher than that of Al-5Cu alloy, respectively. Besides, the rheological model of nanoSiCP/Al-5Cu composites was established based on the fitting curve, which can precisely describe the relationship between the apparent viscosity of nanocomposites slurry and nanoSiCp mass fraction.

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Influence of Morphology on the Rheological Behavior of Semi-Solid A356 Aluminum Alloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.116-117.601 ◽

2006 ◽

Vol 116-117 ◽

pp. 601-605

Author(s):

Heng Hua Zhang ◽

Xian Nian Zhang ◽

Guang Jie Shao ◽

Luo Ping Xu ◽

Yi Tao Yang ◽

...

Keyword(s):

Aluminum Alloy ◽

Solid State ◽

Rheological Behavior ◽

Apparent Viscosity ◽

Flow Behavior ◽

A356 Alloy ◽

Solid Alloy ◽

A356 Aluminum Alloy ◽

A356 Aluminum ◽

Semi Solid

The morphology of semi-solid alloy is one of the key influence factors on the rheological behavior of slurry during die filling and the mechanical properties of formed parts. However, it is difficult to study such effect due to hard controlling of morphology in semi-solid state. In this paper, a self-developed Searle-type viscometer was used to determine the rheological behavior of A356 aluminum alloy in different morphology, which was refined with the salts mixture of K2TiF6 and KBF4. The results indicated that the flow behavior of refined A356 alloy in the semi-solid state possesses obviously thixotropic behavior under isothermal shearing condition with less time to reach steady state and lower steady apparent viscosity as compared to that of the A356 alloy. During continuous cooling at a constant shearing rate, the apparent viscosity of refined A356 slurry in the same solid fraction decreased with the content of Ti. It is shown from quantitative image analysis that the primary α-Al grain in the refined alloy evolves from dendrites to rosettes or sphericitys, and then tends to be rounder and finer in higher Ti content. The mechanism of the influence of morphology on rheological behavior was also discussed in this paper.

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

Metallurgical and Materials Transactions A ◽

10.1007/s11661-020-05996-7 ◽

2020 ◽

Vol 51 (12) ◽

pp. 6421-6431

Author(s):

João Paulo Gabre Ferreira ◽

Luciano Augusto Lourençato ◽

Angel Sánchez Roca ◽

Hipolito Domingo Carvajal Fals

Keyword(s):

Aluminum Alloy ◽

Rheological Behavior ◽

Semi Solid

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Numerical Simulation of Die Casting for Semi-Solid Aluminium Alloy and its Mould Research

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.2717 ◽

2011 ◽

Vol 201-203 ◽

pp. 2717-2720

Author(s):

Yong Huang ◽

Yao Huang ◽

Qiong Wu ◽

Xiao Ming Du ◽

Cheng Zhi Wang

Keyword(s):

Aluminum Alloy ◽

Die Casting ◽

Heating System ◽

Mold Filling ◽

Standard Samples ◽

Solid Aluminum ◽

Mould Cavity ◽

Semi Solid ◽

Filling Characteristics ◽

Filling And Solidification

With consideration of the viscosity of semi-solid aluminum alloy slurry and the mold filling characteristics in die casting, the die-casting mould for semi-solid aluminum alloy has been designed and manufactured on the basis of the standard samples. The process of mold filling and solidification of semi-solid aluminum alloy in die casting was simulated by using ProCAST software. With combination of simulation results with die casting experimental data, the results indicate that the influence of heating system of the mould and cross section of ingate for the mould on flowing of semi-solid aluminum alloy in mould cavity is important in this work.

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

International Journal of Minerals Metallurgy and Materials ◽

10.1007/s12613-017-1452-z ◽

2017 ◽

Vol 24 (6) ◽

pp. 691-700 ◽

Cited By ~ 8

Author(s):

Zhi-yong Liu ◽

Wei-min Mao ◽

Wei-pan Wang ◽

Zhi-kai Zheng ◽

Rui Yue

Keyword(s):

Aluminum Alloy ◽

Mold Filling ◽

Semi Solid

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Numerical Simulation of Semi-Solid Die Casting of Housing Cap Earing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.472-475.1921 ◽

2012 ◽

Vol 472-475 ◽

pp. 1921-1925 ◽

Cited By ~ 1

Author(s):

Yong Huang ◽

Guo Hai Yao ◽

Xiao Ming Du

Keyword(s):

Numerical Simulation ◽

Aluminum Alloy ◽

Apparent Viscosity ◽

Die Casting ◽

Solidification Process ◽

Simulation Method ◽

Mold Filling ◽

Solid Aluminum ◽

Increase With Increase ◽

Semi Solid

The influence of the apparent viscosity and pouring temperatures of the semi-solid aluminum alloy on filling and solidification process of the housing cap bearing under the condition of die casting was analyzed using numerical simulation method. The results of simulation show that the mold filling velocity of the semi-solid aluminum alloy decreases markedly with increase of the apparent viscosity. The influence of the pouring temperatures of the semi-solid aluminum alloy on the mold filling velocity is consistent with that of the traditional die casting. The solidification temperatures at the same position of the casting increase with increase of the apparent viscosity of the semi-solid aluminum alloy. There is no casting defect in the casting after complete solidification.

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