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Orientation Relationship And Interfacial Structure Between Nb Solid Solution Precipitates And α-nb_5si_3 Intermetallics

机译:Nb固溶体沉淀与α-nb_5si_3金属间化合物的取向关系和界面结构

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摘要

The orientation relationship (OR) and the interfacial structure between Nb solid solution (Nbss) precipitates and α-Nb_5Si_3 intermetallics have been investigated by transmission electron microscopy (TEM). The OR between Nbss and α-Nb_5Si_3 was determined by selected-area electron diffraction analyses as (222)_(Nb)//(002)_α and [110]_(Nb)//[110]_α. High-resolution TEM images of the Nbss/α-Nb_5Si_3 interface were presented. Steps existed at the interface that acted as centers of stress concentration and released the distortion of lattices to decrease the interfacial energy. In addition, the interfacial models were proposed based on the observed OR to describe the atomic matching of the interface. The distribution of alloying elements at the Nbss/α-Nb_5Si_3 interface has also been investigated, and Hf was enriched at the interface to strengthen the grain boundary.
机译:通过透射电子显微镜(TEM)研究了Nb固溶体(Nbss)析出物与α-Nb_5Si_3金属间化合物之间的取向关系(OR)和界面结构。通过选择区域电子衍射分析将Nbss与α-Nb_5Si_3之间的OR确定为(222)_(Nb)//(002)_α和[110] _(Nb)// [110]_α。呈现了Nbss /α-Nb_5Si_3界面的高分辨率TEM图像。在界面处存在台阶,这些台阶充当应力集中的中心,并释放了晶格的畸变以降低界面能。另外,基于观察到的OR提出了界面模型,以描述界面的原子匹配。还研究了Nbss /α-Nb_5Si_3界面处合金元素的分布,并在界面处富集了Hf以强化晶界。

著录项

  • 来源
    《Journal of Materials Research》 |2009年第1期|192-197|共6页
  • 作者

    G.M. Cheng; Y.X. Tian; L.L. He;

  • 作者单位
  • 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
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