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首页> 外文期刊>Materials Research Innovations >Microstructure evolution and solidification behaviour of Nb‐16Si‐22Ti‐2Cr‐2Al‐6Hf alloy processed by directional solidification
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Microstructure evolution and solidification behaviour of Nb‐16Si‐22Ti‐2Cr‐2Al‐6Hf alloy processed by directional solidification

机译：定向凝固Nb-16Si-22Ti-2Cr-2Cr-2Al-6Hf合金的组织演变与凝固行为

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摘要

The microstructure evolution and solidification behaviour of Nb–16Si–22Ti–2Cr–2Al–6Hf alloynprocessed by liquid metal cooled directional solidification were investigated. The temperaturesn(1850 and 1900℃) and withdrawal rates (1.2, 3, 6, 12 and 18 mm min~(-1)) were selected. Thendirectionally solidified alloy was composed of primary Nb solid solution dendrites, silicide lathsnand two types of eutectic (fish bone-like and lamellar eutectic) aligned along the growth direction.nAs the withdrawal rate increased, the microstructure of the quasi-steady state growth regionnbecame finer and the volume fractions of (Nb,X)5Si3 laths and the fish bone-like eutecticn(Nb,Ti)SSz(Nb,X)_5Si_3 increased, which was contrary to lamellar eutectic (Nb,Ti)_(SS)+(Nb,X)_5Si_3.nThe volume fraction of (Nb,X)_5Si_3 laths in the whole directionally solidified rod decreased as thentemperature increased from 1850 to 1900℃. In addition, the solidification paths were alsondiscussed.
机译：研究了液态金属冷却定向凝固工艺处理的Nb-16Si-22Ti-2Ti-2Cr-2Al-6Hf合金的组织演变和凝固行为。选择温度n（1850和1900℃）和抽出速率（1.2、3、6、12和18 mm min〜（-1））。然后定向凝固的合金由沿生长方向排列的主要Nb固溶树枝状晶体，硅化物板条和两种共晶（鱼骨状和层状共晶）组成.n随着退出速率的增加，准稳态生长区域的组织变得更细（Nb，X）5Si3条和鱼骨状共晶（Nb，Ti）SSz（Nb，X）_5Si_3的体积分数增加，这与层状共晶（Nb，Ti）_（SS）+（ Nb，X）_5Si_3.n（nb，X）_5Si_3板条在整个定向凝固棒中的体积分数随温度从1850升高到1900℃而降低。此外，还讨论了固化路径。

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  • 来源
    《Materials Research Innovations》 |2013年第3期|184-188|共5页
  • 作者

    S N Yuan; L N Jia; L F Su; L M Ma; H Zhang;

  • 作者单位

    School of Materials Science and Engineering Beihang University Beijing100191 China;

    School of Materials Science and Engineering Beihang University Beijing100191 China;

    School of Materials Science and Engineering Beihang University Beijing100191 China;

    School of Materials Science and Engineering Beihang University Beijing100191 China;

    zhanghu@buaa.edu.cn;

  • 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

    Nb–Si based alloy; Directional solidification; Microstructure; Solidification path;

    机译：Nb-Si基合金;定向凝固;微观结构凝固路径;

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