| Simulation of nucleation and coalescence of second phase droplets during earth-based solidification process of immiscible alloys |
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| 引用本文： | 刘源,郭景杰,贾均,李言祥. Simulation of nucleation and coalescence of second phase droplets during earth-based solidification process of immiscible alloys[J]. 中国有色金属学会会刊, 2005, 15(3): 479-484 |
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| 作者姓名： | 刘源 郭景杰 贾均 李言祥 |
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| 作者单位： | Department of Mechanical Engineering，Tsinghua University，Beijing 100084，China，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 150001，China，Department of Mechanical Engineering，Tsinghua University，Beijing 100084，China |
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| 摘 要： | 1INTRODUCTION Theproductionofuniform,homogeneous micro compositesfrommaterialshavingdifferentdensities,suchasimmisciblesystemsisdesirable formanyapplications,forexample,asengineering andelectronicmaterialsandself lubricatingbear ings[1].Thesolidifiedmicrostructureofimmiscible alloysstronglydependsonthenucleation,diffu sionalgrowth,collisionandcoalescenceofthesec ondphasedroplets.Therehavebeenseveralat temptstomodelatleastpartofthemicrostructure evolutioninthemiscibilitygap.RogersandDa vis…
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| 关 键 词： | 固化微结构 不互溶合金 聚结模式 晶核形成 |
Simulation of nucleation and coalescence of second phase droplets during earth-based solidification process of immiscible alloys |
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| LIU Yuan,GUO Jing-jie,JIA Jun,LI Yan-xiang. Simulation of nucleation and coalescence of second phase droplets during earth-based solidification process of immiscible alloys[J]. Transactions of Nonferrous Metals Society of China, 2005, 15(3): 479-484 |
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| Authors: | LIU Yuan GUO Jing-jie JIA Jun LI Yan-xiang |
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| Abstract: | The solidified microstructure of immiscible alloys strongly depends on the nucleation, diffusional growth, especially the coalescence of the second phase droplets in the miscibility gap. A numerical model based on the discrete multi-particle approach was developed to simulate the nucleation and coalescence mode of the second phase droplets during the earth-based processing of immiscible alloys (in this case, the effect of gravity cannot be neglected). The cooling rate is the major factor influencing the coalescence mode. Under the super-rapid or rapid solidification condition (＞104 K/s), Brownian collision is the dominant coalescence mode. Marangoni collision becomes the dominant mode under the sub-rapid solidification condition (＞102 K/s). In the conventional slow cooling scope(101 K/s), Stokes collision becomes the dominant coalescence mode, correspondingly, leading to a serious phase segregation. |
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| Keywords: | immiscible alloys coalescence mode nucleation earth-based processing |
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