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首页> 外文会议>1st international conference on 3D materials science 2012 >3D MICROSTRUCTURES OF Sb_2Te_3 PRECIPITATES IN PbTe MATRIX WITH PREDICTION BY A WEAK COMPATIBILITY CONDITION
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3D MICROSTRUCTURES OF Sb_2Te_3 PRECIPITATES IN PbTe MATRIX WITH PREDICTION BY A WEAK COMPATIBILITY CONDITION

机译：通过弱相容性条件预测PbTe基质中Sb_2Te_3析出物的3D微观结构

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摘要

We propose that a weak compatibility condition predicts the elongated directions for Widmanstaetten type precipitates. The distribution of the elongated directions of precipitates lies on a family of crystallographically equivalent cones in 3D determined by a certain transformation stretch matrix obtained independently. A 3D visualization and digitization method is developed to show how the cone variants control the preferred growth directions during precipitation of Sb_2Te_3 in a (5 μm)~3 PbTe matrix. A series of two-dimensional secondary electron images are acquired along the direction perpendicular to the imaging plane. By pixelating all the images and calculating the position vectors on the surface of each precipitate, the elongation directions are calculated using a 3-dimensional ellipsoidal fitting for 182 precipitates. The 3D plot of the elongation directions shows that their spacial orientations are close to four predicted cones with a standard deviation of 5.6°. The length along the elongation directions reveals an asymmetric distribution with a mean value of about 240 nm. The total volume fraction of the precipitates is 8.3 %. The average area of the precipitates per volume is 0.68 μm~(-1) by one point statistical calculation. These results build on our study presented in by analyzing a significantly bigger data set and by including the length distribution and 1-point statistics.
机译：我们建议弱相容性条件预测Widmanstaetten型沉淀物的拉长方向。析出物的伸长方向的分布位于3D晶体学上等效的圆锥族上，这些圆锥体是由独立获得的某个变换拉伸矩阵确定的。开发了一种3D可视化和数字化方法，以显示在（5μm）〜3 PbTe基质中Sb_2Te_3沉淀过程中，锥变体如何控制优选的生长方向。沿垂直于成像平面的方向获取一系列二维二次电子图像。通过对所有图像进行像素化并计算每个析出物表面上的位置矢量，使用针对182个析出物的3维椭球拟合来计算延伸方向。伸长方向的3D图显示，它们的空间方向接近四个预测的圆锥，标准偏差为5.6°。沿伸长方向的长度显示出不对称分布，平均值约为240 nm。沉淀物的总体积分数为8.3％。通过一点统计计算，每单位体积的析出物平均面积为0.68μm〜（-1）。这些结果建立在我们的研究的基础之上，通过分析更大的数据集并包括长度分布和1点统计来提出。

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  • 来源
  • 会议地点 Seven Springs PA(US)
  • 作者

    Xian Chen; Shanshan Cao; Teruyuki Ikeda; Vijay Srivastava; G. Jeffrey Snyder; Dominique Schryvers; Richard D. James;

  • 作者单位

    Department of Aerospace Engineering and Mechanics, 107 Akerman Hall, University of Minnesota, Minneapolis, MN 55414, USA;

    Electron Microscopy of Materials Science (EMAT), University of Antwerp, Antwerp, Belgium;

    Materials Science, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125, USA;

    Department of Aerospace Engineering and Mechanics, 107 Akerman Hall, University of Minnesota, Minneapolis, MN 55414, USA;

    Materials Science, California Institute of Technology, 1200 E California Blvd., Pasadena, CA 91125, USA;

    Electron Microscopy of Materials Science (EMAT), University of Antwerp, Antwerp, Belgium;

    Department of Aerospace Engineering and Mechanics, 107 Akerman Hall, University of Minnesota, Minneapolis, MN 55414, USA;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Compatibility; Slice-and-view; Widmanstaetten; Precipitates; Focused-ion-beam;

    机译：兼容性;切片视图Widmanstaetten;沉淀物；聚焦离子束;

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