论文

光学浮区定向生长Ti-43Al-3Si合金

  • 刘荣华 ,
  • 滕春禹 ,
  • 崔玉友 ,
  • 徐东生 ,
  • 线全刚 ,
  • 杨锐
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  • 中国科学院金属研究所, 沈阳 110016
刘荣华, 男, 1978年生, 博士

收稿日期: 2011-09-29

  修回日期: 2011-11-01

  网络出版日期: 2012-02-11

DIRECTIONAL SOLIDIFICATION OF Ti–43Al–3Si ALLOYS IN AN OPTICAL FLOATING ZONE FURNACE

  • LIU Rong-Hua ,
  • TENG Chun-Yu ,
  • CUI Yu-You ,
  • XU Dong-Sheng ,
  • XIAN Quan-Gang ,
  • YANG Rui
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  • Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Received date: 2011-09-29

  Revised date: 2011-11-01

  Online published: 2012-02-11

摘要

采用光学浮区定向凝固炉, 对Ti-43Al-3Si合金进行引晶定向生长研究.从直径70 mm铸棒中切取直径9 mm多晶棒为籽晶, 在5 mm/h的速度下引晶生长出了微观片层平行于生长方向的定向合金. 采用OM对获得试样的组织进行观察,结果表明, 在开始凝固的L+α+β三相共存区中, 多晶棒有效引晶并控制了心部α相, 并在曲面生长条件下逐渐发展成为占据主导地位的组织结构. 对实验中多晶籽晶的选取、三相共存及曲面生长原理进行了深入讨论.

本文引用格式

刘荣华 , 滕春禹 , 崔玉友 , 徐东生 , 线全刚 , 杨锐 . 光学浮区定向生长Ti-43Al-3Si合金[J]. 金属学报, 2012 , 48(2) : 235 -239 . DOI: 10.3724/SP.J.1037.2011.00620

Abstract

Directional solidification (DS) process of Ti–43Al–3Si alloys in an optical floating zone furnace has been studied. The Φ9 mm polycrystalline rods with appropriate microstructure were cut from Φ70 mm cast ingot and used as seeds. At a growth rate of 5 mm/h, the DS ingot with lamellar structure parallel to longitudinal axis was obtained. The results of OM show that in the L+α+β three–phase region, the central α phase was successfully seeding by the polycrystalline rods and gradually develops into a dominant microstructure under a bent solid–liquid interface. The selection of polycrystalline seed, principle of three–phase region and bent solid–liquid interface directional solidification were discussed in detail.

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