Capture and conversion rule for simulation of solidified microstructure of magnesium alloy

Abstract

The invention discloses a capture and conversion rule for the simulation of a solidified microstructure of a magnesium alloy and belongs to the technical field of material processing. The rule is characterized in that: an orthohexagnal crystal nucleus is placed at the central position of a liquid cell which meets nucleation conditions; the crystal nucleus grows constantly along with the continuity of the solidification process; an adjacent cell is captured to serve as an interfacial cell when a corner of the crystal nucleus enters the adjacent cell, and an orthohexagnal crystal nucleus of which the crystal orientation is the same as that of a parent cell is placed at the corner so as to represent the nucleation of the adjacent cell; the cell does not participate in the nucleation and growth calculation when adjacent cells of the cell are all non-liquid; and the interfacial cell continues to capture other neighbor cells by the method. The rule has the advantages that: the growth of grains of the magnesium alloy at any angle can be realized under the configuration of a square cell and simple neighbors, and a simulation result can embody the anisotropy of grain growth; and the judgment required on the configuration of four adjacent cells is less than that of other adjacent cells during simulation, and the time required by iterative computation is short.

Description

technical field [0001] The invention belongs to the technical field of material processing, and relates to the solidification structure simulation of magnesium alloys, in particular to a capture and conversion rule for the solidification structure simulation of magnesium alloys. Background technique [0002] Cellular Automaton (CA) was proposed in the early 1950s by the famous mathematician Neumann, the founder of computer. Its basic idea is that a cell or a basic unit of a system determines its own state according to the rules set in advance according to the conditions of other neighboring units, so as to describe the overall complex state of the system by defining local simple rules. Evolution. Cellular automata have four elements: (1) The solution area is formed by the regular arrangement of cells with the same size and geometric structure. In two-dimensional case, square or hexagonal lattice is the most common form; (2) element (3) Each cell has a different state value...

AI Technical Summary

Problems solved by technology

However, magnesium has a close-packed hexagonal structure, and traditional methods cannot reflect its anisotropy

Although relevant literature has developed a model to simulate the solidification structure of magnesium alloys, the model still has certain shortcomings, such as complex capture rules, the use of shape function approximation for dendrites, and the growth of grains at certain specific angles can only be achieved.

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