Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 24    No. 9    September 2014

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Phase field model for strong interfacial energy anisotropy of HCP materials
Xun-feng YUAN1,2, Bao-ying LIU1, Chun LI2, Chun-sheng ZHOU2, Yu-tian DING3

1. College of Electronic Information and Electrical Engineering, Shangluo University, Shangluo 726000, China;
2. Shaanxi Key Laboratory of Comprehensive Utilization of Tailing Resources,
Shangluo University, Shangluo 726000, China;
3. State Key Laboratory of Gansu Advanced Nonferrous Metal Materials,
Lanzhou University of Technology, Lanzhou 730050, China

Abstract:Based on the Karma model and the Eggleston regularization technique of the strong interfacial energy anisotropy, a phase-field model was established for HCP materials. An explicit finite difference numerical method was used to solve phase field model and simulate the dendrite growth behaviors of HCP materials. Results indicate that the dendrite morphology presents obvious six-fold symmetry, and discontinuity in the variation of interface orientation occurs, resulting in a fact that the corners were formed at the tips of the main stem and side branches. When the interfacial energy anisotropy strength is lower than the critical value(1/35), the steady-state tip velocity of dendrite increases with anisotropy as expected. As the anisotropy strength crosses the critical value, the steady-state tip velocity drops down by about 0.89%. With further increase in anisotropy strength, the steady-state tip velocity increases and reaches the maximum value at anisotropy strength of 0.04, then decreases.

 

Key words: phase field; dendrite growth; interfacial energy; anisotropy strength; HCP materials

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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