快速凝固Ti-55合金中稀土第二相双模型分布的形成

金属学报, 1995, 31(9): 417-421.

快速凝固Ti-55合金中稀土第二相双模型分布的形成

关键词：快速凝固 , Ti-55 alloy , RE-rich second phase , bimodel.

FORMATION OF BIMODEL DISTRIBUTION OF RE-RICH SECOND PHASE PARTICLES IN RAPIDLY SOLIDIFIED Ti-55 ALLOY

LI Geping , (Institute of Metal Research , Chinese Academy of Sciences , Shenyang 110015) LI Dong

Keywords： : rapid solidification , Ｔｉ－５５合金 , 稀土第二相 , 双模型分布

对快速凝固Ｔｉ－５Ａｌ－４Ｓｎ－２Ｚｒ－１Ｍｏ－０．２５Ｓｉ－１Ｎｄ（Ｔｉ－５５）高温钛合金９８０℃，５ｈ处理样品的透射电镜分析表明，稀土第二相在合金中以双模型分布，较小颗粒尺寸为２０－８０ｎｍ，较大颗粒尺寸为２００－３００ｎｍ．在扩散控制第二相粒子长大动力学方程的基础上，运用扰动理论，分析了第二相颗粒尺寸的定态解的稳定性，并验证了双模型分布．

The rapid-solidified Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd (Ti-55) high temperature alloy heat-treated 5h at 980℃ has been studied by TEM. The results show that the distribution of the RE-rich second phase particles is bimodel, the amount of the smaller particles (20─80 nm in diameter) is considerably larger than that of the large particles (200─300nm in diameter). Based on a diffusion－controlled growth kinetics equation, the formation mechanism of the bimodel distribution of the RE-rich second phase particles in the alloy is explained by using the disturbing theory.

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