摘要
采用透射电镜观察了快冷态Ｔｉ－５Ａｌ－４Ｓｎ－２Ｚｒ－１Ｍｏ－０．２５Ｓｉ．０．３～１．２Ｎｄ合金（Ｔｉ－５５合金）稀土相的形貌，发观稀土相尺寸细小（４～３４ｎｍ），呈球状，均匀弥散地分布在基体中，晶界上稀土相呈椭球状，沿晶界排列。采用图像分析仪对铸态Ｔｉ－５５合金稀土相进行了分析，结果表明，４种成分合金的稀土相平均尺寸为３．２５～３．５０μｍ，平均圆度系数为０．５６～０．６３，呈椭球状，棒状及不规则状，分布于晶界与晶内，其均匀弥散度劣于快冷态Ｔｉ－５５合金的稀土相。
Transmission eletron microscope studies of melt-quenched Ti-5Al-4Sn-2Zr-1Mo-0.25Si-0.3～1.2Ndalloy show that spherical rare earth-enriched phase particles of 4～34nm in diameter distribute fairly uni-formly in the matrix,besides which,ellipsoidal particles are aligned along the grain boundary. The as-castTi-5Al-4Sn-2Zr-1Mo-0. 25Si-0.3～1. 2Nd alloy is studied by using an image analyzer, The rare earth-en-riched phase particles which nonuniformly distribute in grain and grain boundary are about 3.25～3. 50μmin diameter. The average value of circularity shape factor is 0.56～0.63,and the shapes of particles aremainly ellipsoids ,and a few kinds of irregular morphologies like needle and block ,so its uniform degree isless than the rare earth-enriched phase particles in the melt-quenched Ti-5Al-4Sn-2Zr-1Mo-0. 25Si-0.3～1. 2Nd alloy.
出处
《航空材料学报》
CAS
CSCD
1994年第3期19-26,共8页
Journal of Aeronautical Materials
关键词
稀土相
快冷态
铸态
钛-55合金
rare earth-enriched phase particle,Ti-5Al-4Sn-2Zr-1Mo-0. 25Si-0.3～1.2Nd alloy,as-cast state,melt-quenched state
