Three-Dimensional Modeling and Simulation of Dendrite Morphology of Cast Mg Alloys

Liang Huo; Zhi Qiang Han; Bai Cheng Liu

doi:10.4028/www.scientific.net/MSF.654-656.1516

Paper Titles

Numerical Characterization of Anisotropic Heat Sink Composites
p.1500

Phase Field Simulation of Ni₄Ti₃ Precipitation in Porous NiTi Shape Memory Alloys under Applied Stresses
p.1504

The Identification of Phase by Overlapping of First Derivative of Dilatation in Low Carbon Steels Multi-Phase Presenting
p.1508

A Monte Carlo Simulation of Melting in Prototype Crystal
p.1512

Three-Dimensional Modeling and Simulation of Dendrite Morphology of Cast Mg Alloys
p.1516

A New Algorithm of Phase Field Approach to Polycrystalline Dendritic Solidification in Two and Three Dimensions
p.1520

Phase Field Modelling of Dendrite Fragmentation during Thermal Shock
p.1524

A Cellular Automaton Model with the Lower Mesh-Induced Anisotropy for Dendritic Solidification of Pure Substance
p.1528

Homogenisation of Cast Microstructures: Thermodynamic Calculation and Kinetic Simulation
p.1532

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Three-Dimensional Modeling and Simulation of Dendrite Morphology of Cast Mg Alloys

Abstract:

A three-dimensional (3-D) cellular automaton (CA) model for simulating the dendrite morphology of cast Mg alloys has been developed. In the model a technique based on two sets of mesh is utilized to perform the simulation to reproduce the texture of Mg dendrites. The CA calculation is performed using a set of mesh that is defined by the hexagonal close-packed (HCP) crystal lattice, and other computations are carried out by using a cubic mesh. The two sets of mesh are coupled by using interpolation method. The kinetics of the solid-liquid interface is obtained directly by the difference between local equilibrium composition and local actual composition given by the solute transport equation. The model was used to simulate 3-D columnar growth of sixteen grains and 3-D equiaxed growth of a single dendrite of AZ91D alloy. Permanent mold castings of AZ91D alloy were produced and sampled for optical metallographic examinations, and the simulated results were compared with the metallographic results.