Mechanical properties in the semi-solid state and hot tearing of aluminium alloys

Eskin, Dmitry; Suyitno, Suyitno; Katgerman, L.

doi:10.1016/s0079-6425(03)00037-9

Cited by 677 publications

(451 citation statements)

References 29 publications

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“…Although grain refinement helps to reduce the initiation of cracks, 1,2 this defect still appears at a high casting speed thus limiting the productivity of the process.…”

Section: Introductionmentioning

confidence: 99%

“…For example, this model predicts 5 that hot tearing formation is a function of both the imposed strain and strain rate on the mushy zone during solidification, as reported experimentally. 1 In the following sections, we first provide a qualitative validation of the failure model against experimental results showing crack propagation during semisolid deformation in Al-Cu alloys, Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of Hot Tear Formation in Vertical DC Casting of Aluminum Billets Using a Granular Approach

Sistaninia

Drezet

Phillion

et al. 2013

JOM

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“…Although grain refinement helps to reduce the initiation of cracks, 1,2 this defect still appears at a high casting speed thus limiting the productivity of the process.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of Hot Tear Formation in Vertical DC Casting of Aluminum Billets Using a Granular Approach

Sistaninia

Drezet

Phillion

et al. 2013

JOM

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“…[8,45,46] In the mushy zone, compressive deformation is similar to the squeezing of a sponge, causing the intergranular liquid to flow out and the pressure within this liquid to increase. Figure 8 shows the simulated mechanical behavior of the mushy zone in compression as a function of g s for the same parameters C and K used in tension.…”

Section: Compression Deformationmentioning

confidence: 99%

Simulation of Semi-Solid Material Mechanical Behavior Using a Combined Discrete/Finite Element Method

Sistaninia

Phillion

Drezet

et al. 2010

Metall Mater Trans A

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As a necessary step toward the quantitative prediction of hot tearing defects, a three-dimensional stress-strain simulation based on a combined finite element (FE)/discrete element method (DEM) has been developed that is capable of predicting the mechanical behavior of semisolid metallic alloys during solidification. The solidification model used for generating the initial solid-liquid structure is based on a Voronoi tessellation of randomly distributed nucleation centers and a solute diffusion model for each element of this tessellation. At a given fraction of solid, the deformation is then simulated with the solid grains being modeled using an elastoviscoplastic constitutive law, whereas the remaining liquid layers at grain boundaries are approximated by flexible connectors, each consisting of a spring element and a damper element acting in parallel. The model predictions have been validated against Al-Cu alloy experimental data from the literature. The results show that a combined FE/DEM approach is able to express the overall mechanical behavior of semisolid alloys at the macroscale based on the morphology of the grain structure. For the first time, the localization of strain in the intergranular regions is taken into account. Thus, this approach constitutes an indispensible step towards the development of a comprehensive model of hot tearing.

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“…Although hot tearing is known to be affected by a number of microstructural and processing factors, efforts to quantitatively predict this defect have met with only limited success [15]. There are several requirements that must be met in order to improve this predictive capability.…”

Section: Introductionmentioning

confidence: 99%

A three-phase simulation of the effect of microstructural features on semi-solid tensile deformation

Phillion¹,

Cockcroft²,

Lee³

2008

Acta Materialia

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A direct finite element microstructure model for prediction of the deformation behavior of semisolid metallic alloys is presented. The 2D model geometry is based on a modified Voronoi tessellation, and includes rounded corners to approximate an equiaxed-globular grain structure, liquid surrounding the grains, and micro porosity. An elasto-plastic empirical constitutive equation is derived for the solid grains, while the liquid is approximated as a perfectly plastic material with a very low yield stress. The resulting three-phase model was used to investigate the effects of fraction solid, porosity, and grain size on the constitutive behavior of a semi-solid aluminum alloy, AA5182. The model predictions were validated against experimental data at high fraction solid. These simulations reveal a strong correlation between semi-solid grain size and yield stress, and between porosity and strain localization. The application of direct finite element simulations is shown to be an effective technique for examining the effects of microstructure phenomena on the macro constitutive behavior of semi-solid materials.

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Mechanical properties in the semi-solid state and hot tearing of aluminium alloys

Cited by 677 publications

References 29 publications

Prediction of Hot Tear Formation in Vertical DC Casting of Aluminum Billets Using a Granular Approach

Prediction of Hot Tear Formation in Vertical DC Casting of Aluminum Billets Using a Granular Approach

Simulation of Semi-Solid Material Mechanical Behavior Using a Combined Discrete/Finite Element Method

A three-phase simulation of the effect of microstructural features on semi-solid tensile deformation

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