Numerical Analysis of Semi-Solid Die-Casting Automobile Part Based on the Thermo-Visco-Plastic Constitutive Relation

Wang, Jiao Jiao; Lu, Gui Min; Yu, Jianguo

doi:10.4028/www.scientific.net/amr.1096.268

Cited by 7 publications

(6 citation statements)

References 11 publications

(13 reference statements)

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“…The most distinct characteristic of thixoformed microstructure is the co-existence of liquid and solid during processing (since this occurs at semi-solid temperatures), and the formation of a primary phase with near-spherical grain morphology [9][10][11]. This process has received considerable attention recently due to its significant advantages over traditional metal forming process, such as minimization of as-cast porosity and macrosegregation; reduced forming temperatures, forming forces, and machining costs; and high strength and corrosion resistance [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Wang

Zhang²,

Phillion

et al. 2016

J. Mater. Res.

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A novel two-stage reheating process with new alloy design has been developed to improve the microstructure morphology of semi-solid Al-Si casting aluminum alloy for thixoforming. The process consists of first reheating the material to the liquidus temperature, holding for 5 minutes, and then lowering to the predetermined two-stage reheating temperature between 843 -863 K and holding for 10 minutes. The experimentally-obtained grain diameter, roundness, and the amount of liquid trapped within the solid phase were characterized, along with the microstructure obtained using the traditional feedstock reheating process. The Wilcox test (with α=0.05) was then applied to statistically analyze the measured differences in the microstructures obtained using the two different processing routes. It was found that a refined near-spherical structure with uniform globule size, higher sphericity, lower coarsening rate constant, and less entrapped liquid was obtained via the new two-stage reheating process in comparison with the microstructure obtained using the traditional feedstock reheating process.

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Section: Introductionmentioning

confidence: 99%

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Wang

Zhang²,

Phillion

et al. 2016

J. Mater. Res.

Self Cite

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“…Due to the small length scale, neither classical continuum mechanics nor traditional numerical methods, such as FEA, are sufficient in predicting the material properties [25,26,27].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Tensile Behavior on Ceramic Particles Reinforced Aluminum Matrix Nanocomposites

Gu¹

2016

IJMSA

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The mechanical properties and interfacial structures for aluminum matrix composites reinforced by nanometer-sized SiC-β particles has been studied using molecular dynamics (MD) simulation. The modified embedded atom methods, was implemented to describe the atomic interactions. The molecular model undergoes an annealing MD simulation from 300 K to 1000 K to reach its minimum energy point. Tensile tests were performed with periodic boundary conditions. The stress-strain relationship has been studied and elastic constants were predicted as well. The results were compared with those given by continuum-based finite element analysis (FEA) together with the experimental data available in the literatures. It showed that both the elastic modulus and yield stress were further strengthened due to the presence of the nano-particles. Also, it was found that the existing SiC nano-particles have an effect on the initial arrangement of Al atoms in such a manner: Al atoms were inclined to aggregate around the particle surface. Aluminum concentrations were also observed inside the SiC particles close to the surface. The depth of hybridization is uniform and planar.

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“…Effects of pouring temperature [5], interface heat transfer coefficient of metal die [6], solid volume fractions [7] on die filling process have been investigated in literatures. However, little works have been done in literatures about effects of initial temperature distribution of a semi solid slurry on filling course in high pressure die casting.…”

Section: Introductionmentioning

confidence: 99%

Effect of Slurry Temperature Distribution on Semi-Solid Die Casting

Zhang

Wang

et al. 2016

SSP

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Semi-solid alloy slurries with different temperature distributions have diverse flow patterns of the slurries during die casting filling process. This different flow patterns can lead to various degrees of front separation of the slurry metal from the die cavity during die filling process. This separation can result in air entrapment, which is one of the origins for gas porosities and blisters occurred during followed heat treatment. Therefore, in this paper, the effects of slurry temperature distribution on filling patterns during die casting process were investigated. Based on partial filling experiments, positive and negative gradient temperature distribution, together with two homogeneous conditions 575°C, 579°C were compared by computer simulation. The results indicate that the positive gradient temperature condition of 357.0 slurry is more suitable for the semi-solid die casting of the connector, and 7 °C temperature gradient in slurry is appropriate for good filling.

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Numerical Analysis of Semi-Solid Die-Casting Automobile Part Based on the Thermo-Visco-Plastic Constitutive Relation

Cited by 7 publications

References 11 publications

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Alloy development and reheating process exploration of Al–Si casting alloys with globular grains for thixoforming

Molecular Dynamics Simulation of Tensile Behavior on Ceramic Particles Reinforced Aluminum Matrix Nanocomposites

Effect of Slurry Temperature Distribution on Semi-Solid Die Casting

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