PHASE–FIELD SIMULATION OF THE EFFECT OF KINETIC ANISOTROPY ON CRYSTAL GROWTH IN UNDERCOOLED MELTS

Acta Metall Sin

2009, Vol. 45

Issue (10): 1237-1241 DOI:

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PHASE–FIELD SIMULATION OF THE EFFECT OF KINETIC ANISOTROPY ON CRYSTAL GROWTH IN UNDERCOOLED MELTS

ZHAO Dawen; LI Jinfu

State Key Laboratory of Metal Matrix Composites; School of Materials Science and Engineering; Shanghai Jiao Tong University; Shanghai 200240

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ZHAO DaWen LI Jinfu. PHASE–FIELD SIMULATION OF THE EFFECT OF KINETIC ANISOTROPY ON CRYSTAL GROWTH IN UNDERCOOLED MELTS. Acta Metall Sin, 2009, 45(10): 1237-1241.

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Abstract

Solidification is generally determined by a complex interplay of heat and/or solute diffusion processes, capillary and/or kinetic effects of the solid/liquid interface. Theoretical analysis indicates that the crystal growth morphology and behavior both depend sensitively on the degree of the capillary and kinetic anisotropy. In present, the influences of capillary anisotropy on crystal growth process have been extensively studied, especially simulated by the phase–field model. Unfortunately, the influences of kinetic anisotropy on the crystal growth morphology and behavior are seldom researched. In this paper, the phase–field model was employed to quantitatively simulate the effects of kinetic anisotropy on the crystal growth in undercooled melts. It is illustrated that the selection of the solid/liquid interface morphology is determined by the kinetic anisotropic parameter if the capillary anisotropy s set as zero. With a wak kinetc anisotropy, the melt solidifies in a fractal pattern, during which there s no obvious preferrd growth drection, and any steady–state gowth cannot be detected. As a stong anisotropy becomes greater than 0.02, the interface morphology changes to a dendritic pattern growth along the h110i orientation. Further analysis indicates that the stability parameter ncreases inearly with the increase of inetic anisotropic parameter and is independent of the kinetic coefficient.

Key words: kinetic anisotropy fractal growth dendrite growth phase--field model adaptive finite element method

Received: 24 February 2009

ZTFLH:

TG142

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Supported by National Natural Science Foundation of China (No.50571068)

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2009/V45/I10/1237

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