Phase field simulation of monotectic transformation for liquid Ni-Cu-Pb alloys

Based on the subregular solution model, the liquid phase separation of ternary （NixCU100-x）50Pb50 monotectic alloys is simulated by the phase field method. It is found that if the surface segregation potential is not incorporated, the dynamic morphologies of alloy melt show a transition from dispers...

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Bibliographic Details
Published in:Chinese science bulletin 2009, Vol.54 (2), p.183-188
Main Authors: Luo, BingChi, Wang, HaiPeng, Wei, BingBo
Format: Article
Language:English
Subjects:
Alloys
Articles/Condensed State Physics
Chemistry/Food Science
Coagulation
Earth Sciences
Engineering
Humanities and Social Sciences
Life Sciences
Morphology
multidisciplinary
Ni-Cu-Pb合金
Physics
Q1
Science
Science (multidisciplinary)
Simulation
偏晶合金
合金微结构
微观相场法
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Summary:Based on the subregular solution model, the liquid phase separation of ternary （NixCU100-x）50Pb50 monotectic alloys is simulated by the phase field method. It is found that if the surface segregation potential is not incorporated, the dynamic morphologies of alloy melt show a transition from disperse microstructure into bicontinuous microstructure with the increase of fluidity parameter. When the surface segregation potential is coupled, Pb-rich phase migrates preferentially to the surface of the liquid alloy, and the Ni-rich phase depends on the Pb-rich phase to nucleate. With the extension of the phase separation time, the surface layer is formed through coagulation and growth, and its thickness gradually increases. The Ni-rich phase migrates to the central part, and finally a two-layer core-shell micro- structure is produced. The concentration in the surface layer fluctuates more conspicuously than that inside the bulk phase, which subsequently transfers from the surface to the interior by a wave. The fluid field near the liquid-liquid interface is strong at the beginning of phase separation, and reduces later on. The surface segregation is essential to the formation of the surface layer, concentration profile variation, fluid field distribution and phase separation morphology.
ISSN:1001-6538
2095-9273
1861-9541
2095-9281
DOI:10.1007/s11434-009-0018-5