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The effect of far-field uniform flow on the particle growth in an undercooled alloy melt

机译:远场均匀流对过冷合金熔体中颗粒生长的影响

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摘要

The present paper studies the mechanism of interface formation in the particle growth in an undercooled alloy melt with a far-field uniform flow. Using the method of matched asymptotic expansion, we obtain an approximate solution for particle growth and determine the pattern formation of crystal-melt interface. The analytical results show that the far-field uniform flow has significant effect on particle growth and the mechanism of the pattern formation of crystal-melt interface is similar to that of the convective pure melt. The drag effect of the far-field uniform flow results in the higher local growth rate in the upstream front, where the flow is incoming and the lower local growth rate in the downstream rear, where the flow is outgoing. Compared with the situation in the pure melt, the solute in the undercooled alloy melt further facilitates the growth of the particle. The critical radius for instability decreases as the far-field uniform flow increases.
机译:本文研究了具有远场均匀流动的过冷合金熔体中颗粒生长中界面形成的机理。使用匹配渐近展开法,我们获得了粒子生长的近似解,并确定了晶体-熔体界面的图案形成。分析结果表明,远场均匀流动对颗粒的生长有显着影响,并且晶体-熔体界面的图案形成机理与对流纯熔体相似。远场均匀流的阻力效应导致上游前部(流入的地方)具有较高的局部增长率,而较低的局部增长率在下游后部(流出的地方)。与纯熔体的情况相比,过冷合金熔体中的溶质进一步促进了颗粒的生长。随着远场均匀流的增加,不稳定性的临界半径减小。

著录项

  • 来源
    《Journal of Crystal Growth》 |2011年第1期|p.145-149|共5页
  • 作者单位

    School of Applied Sciences, University of Science and Technology Beijing, Beijing 100083, China;

    School of Applied Sciences, University of Science and Technology Beijing, Beijing 100083, China;

    Fangda Special Steel Technology Co. Ltd., Nanchang 330012, China;

    General Research Institute of Nonferrous Metals, Beijing 100035, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A1. Convection; A1. Interfaces; A1. Nucleation; A1. Crystal morphology;

    机译:A1。对流;A1。接口;A1。成核;A1。晶体形态;

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