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THREE DIMENSIONAL MULTI-PHASE FIELD SIMULATION OF GROWTH OF EUTECTIC CBr4-C2Cl6 ALLOY
II. Effect of Lamellar Spacing on Morphology Evolution |
| YANG Yujuan, YAN Biao |
| School of Materials Science and Engineering, Shanghai Key Lab of Development and Application for Metal Functional Materials, Tongji University, Shanghai 200092 |
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Cite this article:
YANG Yujuan YAN Biao. THREE DIMENSIONAL MULTI-PHASE FIELD SIMULATION OF GROWTH OF EUTECTIC CBr4-C2Cl6 ALLOY
II. Effect of Lamellar Spacing on Morphology Evolution. Acta Metall Sin, 2010, 46(7): 787-793.
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Abstract Using KKSO multi-phase field model, with equal lamellar width and thickness, three dimensional (3D) morphology evolution, lamellar-rod transition and the mechanism of adjustment of lamellar spacing of CBr4-C2Cl6 alloys are investigated at different initial lamellar spacings. It's found that, as for the hypoeutectic and eutectic CBr4-C2Cl6 alloy, different initial lamellar spacings may lead to lamellar-rod transition, which is related to the initial lamellar spacings. The CBr4-C2Cl6 hypereutectic lamellar alloy can't transit to rod-like eutectic, with the increase of the dimensionless initial lamellar spacings Λ in the range of 0.598-2.336, the sequence of morphology evolution is: lamellar merges to form 1λO→T-xλO→1λO→2λO→lamellar branching→zigzag bifurcation$\rightarrow$lamellar destabilizes to form the disordered pattern. The simulated results also showed that the mechanism of adjustment of lamellar spacing in 3D of the CBr4-C2Cl6 hypereutectic alloy is similar to that in two dimensions (2D), which is lamellar annihilation and branching on the whole, the lamellar annihilation takes place with a smaller initial lamellar spacing while the lamellar branching takes place with a bigger initial lamellar spacing. The adjustment mechanism of the lamellar spacing in 3D is more complex than that in 2D because of the additional effect of the third dimension.
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Received: 19 February 2010
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| Fund: Supported by China Postdoctoral Science Foundation (No.20090460654) and Shanghai Science and Technology Committee (Nos.0752nm004 and 08DZ2201300) |
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