籽晶制备及<strong>Ti-47Al</strong>合金<strong>PST</strong>晶体取向控制

doi:10.11900/0412.1961.2019.00138

金属学报

2019, Vol. 55

Issue (12): 1519-1526 DOI: 10.11900/0412.1961.2019.00138

研究论文

本期目录 | 过刊浏览

籽晶制备及Ti-47Al合金PST晶体取向控制

金浩^1,²,贾清¹,刘荣华¹,线全刚¹,崔玉友¹,徐东生¹,杨锐¹(

)

1. 中国科学院金属研究所沈阳 110016
2. 中国科学院大学北京 100049

Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy

JIN Hao^1,²,JIA Qing¹,LIU Ronghua¹,XIAN Quangang¹,CUI Yuyou¹,XU Dongsheng¹,YANG Rui¹(

)

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. University of Chinese Academy of Sciences, Beijing 100049, China

引用本文:

金浩, 贾清, 刘荣华, 线全刚, 崔玉友, 徐东生, 杨锐. 籽晶制备及Ti-47Al合金PST晶体取向控制[J]. 金属学报, 2019, 55(12): 1519-1526.
JIN Hao, JIA Qing, LIU Ronghua, XIAN Quangang, CUI Yuyou, XU Dongsheng, YANG Rui. Seed Preparation and Orientation Control of PST Crystals of Ti-47Al Alloy[J]. Acta Metall Sin, 2019, 55(12): 1519-1526.

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摘要:

采用真空非自耗电弧炉熔炼得到纽扣锭，利用优化的真空吸铸工艺吸铸制备定向凝固用送料棒。在光学浮区炉中先制备出由单一垂直片层组织构成的Ti-43Al-3Si合金定向试棒，切取合适取向后采用机械镶嵌法与多晶TiAl试棒连接固定后作为初始籽晶。制备圆台形试棒作为送料棒，在5 mm/h的生长速率下，利用初始籽晶引晶圆台试棒制备终极籽晶。终极Ti-43Al-3Si籽晶的片层方向平行于生长方向。用终极籽晶来引晶控制Ti-47Al合金PST晶体的片层取向，结合显微分析研究了晶体生长过程。结果表明，制得的送料棒达到光学浮区炉的入炉生长要求；圆台试棒的使用可有效避免因尺寸突变引起的杂晶形核；在5和180 mm/h的生长速率下，Ti-43Al-3Si合金的初生相均为α相。制得的终极籽晶片层一致性好，由单一晶粒组成，在引晶过程中可以保持片层组织稳定，无杂晶形核。使用该终极籽晶可有效控制整个Ti-47Al合金PST晶体的片层取向。

关键词 ： TiAl合金, PST晶体, 籽晶技术, 定向凝固, 光学浮区炉

Abstract：

Button ingots were prepared by arc melting and feed bars for directional solidification were prepared by optimized drop casting technique. The Ti-43Al-3Si directionally solidified bars with lamellar boundaries perpendicular to the growth direction were prepared at the growth rate of 180 mm/h in an optical floating zone furnace. Cylindrical sections were cut from these perpendicular lamellae with appropriate direction and then fixed on polycrystalline TiAl bars by mechanical setting method to serve as the initial seeds. The ultimate Ti-43Al-3Si seeds with parallel lamellar microstructure were successfully prepared from these initial seeds at the growth rate of 5 mm/h. To avoid the nucleation of stray grains, drop-cast bars with the shape of frustum of a cone were used for the preparation of ultimate seeds. At the growth rates of 5 and 180 mm/h, the primary phase of Ti-43Al-3Si alloy was always the α phase. Polysynthetically twinned (PST) crystals of Ti-47Al alloy were obtained from the Ti-43Al-3Si ultimate seeds and the seeding process was studied by microscopic analysis. Lamellar microstructure of the seed kept stable and recrystallization of the seed was not found. Lamellar orientation of Ti-47Al PST crystals was successfully controlled by the ultimate Ti-43Al-3Si seed.

Key words： TiAl alloy polysynthetically twinned crystal seed technique directional solidification optical floating zone furnace

收稿日期: 2019-04-30

ZTFLH:

TG146.2

基金资助:国家自然科学基金项目(No.51701209)

作者简介: 金浩，男，1989年生，博士生

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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00138 或 https://www.ams.org.cn/CN/Y2019/V55/I12/1519

图1 吸铸原理和光学浮区法晶体生长原理示意图，及圆台试棒纵剖面尺寸

图2 不同压差下的吸铸棒纵剖面形貌

图3 Ti-43Al-3Si合金在180 mm/h生长速率下的纵剖面组织形貌

图4 籽晶小块体与接料杆的连接

图5 终极籽晶外观及纵剖面组织形貌

图6 Ti-47Al PST晶体纵剖面组织形貌

图7 淬火区析出相BSE照片及EDS分析

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