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Roles of impurities on precipitation kinetics of dilute Al-Sc alloys

机译：杂质对稀Al-Sc合金析出动力学的影响

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摘要

High-purity (HP) aluminum and commercial purity (CP) aluminum (major impurities: ～250 at. Ppm Si and ～130 at. Ppm Fe) are alloyed with ～250 to ～1100 at. Ppm Sc and ～50 at. Ppm RE (RE = La, Ce, Pr, or Nd). The alloys are homogenized at 640 ℃ and aged at 300 ℃. The precipitation kinetics, basic mechanical properties, and microstructure are studied using AC electrical conductivity, microhardness measurements, scanning electron microscopy in conjunction with energy dispersive X-ray spectroscopy, and atom-probe tomography, respectively. The Fe and RE elements form micrometer-scale diameter Al_3(Fe,RE) primary precipitates, which have no effect on the mechanical properties. Silicon accelerates the precipitation kinetics of nanometer-scale diameter Al_3Sc precipitates, increasing their number density, thereby resulting in higher microhardness values for CP aluminum than the HP aluminum having the same Sc concentration. Additionally, the Sc equilibrium solubility in the α-Al matrix is estimated and Orowan's strengthening mechanism is confirmed for the Al_3Sc precipitates.
机译：高纯度（HP）铝和商业纯度（CP）铝（主要杂质：〜250 at。Ppm Si和〜130 at。Ppm Fe）与〜250〜1100 at合金化​​。 Ppm Sc和〜50 at。 Ppm RE（RE = La，Ce，Pr或Nd）。合金在640℃均质化，并在300℃时效。分别使用交流电导率，显微硬度测量，扫描电子显微镜结合能量色散X射线光谱学和原子探针层析成像技术研究了沉淀动力学，基本力学性能和微观结构。 Fe和RE元素形成微米级直径的Al_3（Fe，RE）初生沉淀，对机械性能没有影响。硅加快了纳米级直径Al_3Sc沉淀物的沉淀动力学，增加了其数密度，因此与具有相同Sc浓度的HP铝相比，CP铝的显微硬度值更高。另外，估算了Sc在α-Al基体中的平衡溶解度，并确认了Alrows强化机制对于Al_3Sc沉淀。

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  • 来源
    《Materials Science and Engineering》 |2010年第15期|p.3501-3509|共9页
  • 作者

    Ofer Beeri; David C. Dunand; David N. Seidman;

  • 作者单位

    Department of Materials Science and Engineering, Northwestern University Evanston, IL 60208-3108, USA Physics Department, Nuclear Research Center - Negev, P.O. Box 9001, Beer-Sheva, Israel;

    Department of Materials Science and Engineering, Northwestern University Evanston, IL 60208-3108, USA;

    Northwestern University Center of Atom-Probe Tomography (NUCAPT), Evanston, IL 60208-3108 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    dilute aluminum alloys; scandium; precipitation; impurities; atom probe;

    机译：稀铝合金钪;沉淀;杂质原子探针;

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