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金属学报  1996, Vol. 32 Issue (7): 711-717    
  论文 本期目录 | 过刊浏览 |
快凝钛合金中富Nd弥散相的析出及其长大规律
颜莹;韩东;曹名洲
中国科学院金属研究所;中国科学院金属研究所
PRECIPITATION AND GROWTH OF DISPERSED PRECIPITATES IN RAPIDLY SOLIDIFIED TITANIUM ALLOYS CONTAINING RARE EARTH NEODYMIUM
YAN Ying; HAN Dong; CAO Mingzhou (Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)(Manuscript received 1995-09-15; in revised form 1996-03-18)
引用本文:

颜莹;韩东;曹名洲. 快凝钛合金中富Nd弥散相的析出及其长大规律[J]. 金属学报, 1996, 32(7): 711-717.
, , . PRECIPITATION AND GROWTH OF DISPERSED PRECIPITATES IN RAPIDLY SOLIDIFIED TITANIUM ALLOYS CONTAINING RARE EARTH NEODYMIUM[J]. Acta Metall Sin, 1996, 32(7): 711-717.

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摘要: 系统研究了热处理对Ti-5Al-1.5Nd,Ti-5Al-4Sn-1.5Nd(质量分数,%)两种钛合金中析出相长大规律的影响.结果表明,含Nd的钛合金的快凝态基体中分布着大量近球状的析出相,并沿晶体的晶界、亚晶界、位错线等处呈串状析出.在650-800℃温度范围内经不同时间热处理后,析出相逐渐聚集长大,但长大速度都很慢.Ti-5Al-1.5Nd合金中析出相为立方的Nd_2O_3,其长大激活能为117kJ/mol.加入Sn后,析出相的分布更加弥散,析出相中Nd和Sn的平均原子比为1.37:1,经衍射花样的标定,判定为正交的Nd_5Sn_4,其长大速度更慢,长大激活能为170kJ/mol.
关键词 钛合金快速凝固富Nd析出相长大激活能    
Abstract:The influence of heat treatment on growth of precipitates in Ti-5Al-1.5Nd and Ti-SAl-4Sn-1.5Nd(mass fraction, %) alloy was studied in detail. The experimental results show that many near spherical precipitates are present in the matrix of rapidly solidified titanium alloys containing neodymium. But along the grain boundaries, sub-grain boundaries and dislocation lines, and so on, some particles are deposited in the form of strings of pearls. When Ti alloys containing neodymium are subjected to heat treatments at 650, 700, 750, and 800℃ for 1, 8, 27 and 56 h, respectively, the precipitated particles coarsen slowly. EDAX results show that these particles in the Ti-5Al-1.5Nd alloy are found to be rich in Nd. On the basis of the electron diffraction pattern, these particles are identified as Nd_2O_3 with a cubic structure and lattice parameter a=1. 108 nm. The activation energy for the growth of particles is estimated to be 117 kJ/mol. The addition of tin improved the dispersed degree and reduced the rate of growth of these particles which are found to contain both Nd and Sn by the EDAX analysis. And the average atom ratio of neodymium and tin is about 1.37 : 1 in these particles. Electron diffraction analysis shows that the fine precipitates are orthorhombic Nd_5Sn_4 with lattice parameters a= 0.814 nm, b = 1.732 nm,and c= 0.8 14 nm. The growth activation energy of the particles is estimated to be 170 kJ / mol.Correspondent: YAN Ying, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015
Key words titanium alloy    rapid solidification    Nd-rich precipitate    growth activation energy
收稿日期: 1996-07-18     
基金资助:国家自然科学基金
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