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2022-03-07
摘要翻译:
大量关于二元体系快速凝固的实验数据表明,具有初始(名义)化学成分的亚稳固相的形成。这一事实可以通过完全的溶质俘获来解释,从而导致晶体在有限生长速度下的无扩散(化学分块)凝固。特别注意发展一个快速凝固模型,它描述了晶体从化学分配到无扩散生长的转变。通过分析溶质在固-液界面上的扩散和原子在界面上的附着和分离,得到了溶质完全俘获的条件。所得到的界面通量平衡方程考虑了两个动力学参数:界面上的扩散速度$V_{DI}$和体相中的扩散速度$V_d$。该模型描述了在整个凝固速度范围内Si-As合金凝固过程中溶质非平衡分配的实验数据[M.J.Aziz et al.,J.Cryst.Growth{BF 148},172(1995);学报{BF 48},4797(2000)]。
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英文标题:
《Solute trapping and diffusionless solidification in a binary system》
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作者:
Peter Galenko
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最新提交年份:
2007
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分类信息:

一级分类:Physics        物理学
二级分类:Materials Science        材料科学
分类描述:Techniques, synthesis, characterization, structure.  Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术,合成,表征,结构。结构相变,力学性质,声子。缺陷,吸附质,界面
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一级分类:Physics        物理学
二级分类:Statistical Mechanics        统计力学
分类描述:Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变,热力学,场论,非平衡现象,重整化群和标度,可积模型,湍流
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英文摘要:
  Numerous experimental data on the rapid solidification of binary systems exhibit the formation of metastable solid phases with the initial (nominal) chemical composition. This fact is explained by complete solute trapping leading to diffusionless (chemically partitionless) solidification at a finite growth velocity of crystals. Special attention is paid to developing a model of rapid solidification which describes a transition from chemically partitioned to diffusionless growth of crystals. Analytical treatments lead to the condition for complete solute trapping which directly follows from the analysis of the solute diffusion around the solid-liquid interface and atomic attachment and detachment at the interface. The resulting equations for the flux balance at the interface take into account two kinetic parameters: diffusion speed $V_{DI}$ on the interface and diffusion speed $V_D$ in bulk phases. The model describes experimental data on nonequilibrium solute partitioning in solidification of Si-As alloys [M.J. Aziz et al., J. Cryst. Growth {\bf 148}, 172 (1995); Acta Mater. {\bf 48}, 4797 (2000)] for the whole range of solidification velocity investigated.
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PDF链接:
https://arxiv.org/pdf/708.3894
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