Ti_3Al－Nb合金显微组织的研究  

An Investigation of Microstructure of Ti_3Al-Nb Alloy

作　　者：武英[1] 杨德庄[1] 

机构地区：[1]哈尔滨工业大学

出　　处：《材料科学与工艺》1996年第4期48-56,共9页Materials Science and Technology

摘　　要：用透射电镜和ｘ射线能谱分析研究了Ｔｉ_３Ａｌ－Ｎｂ合金（Ｔｉ－２４Ａｌ－１４Ｎｂ－３Ｖ－０．５Ｍｏ）不同热处理状态下的组织结构。结果表明，Ｔｉ_３Ａｌ－Ｎｂ合金经α_２＋β两相区固溶１ｈ水冷处理以及经８５０℃时效２４ｈ空冷处理时，其显微组织由α２相、β２相和″０″相组成；低温区固溶处理，降低冷却速度以及固溶化时效处理均会有针状α２相析出，随着固溶温度的降低，α２相和″０″相的数量逐渐增多。The microstructure of Ti_3Al-Nb alloy in different heat treatment conditions has been investigated by TEM and EDS.The results show that the microstructure of the alloy consists of a_2,B_2 and '0'-phase when the alloy is solution heated at 940 ℃～1100℃ for 1 hour and then quenched in water and aged at 850℃ for 1 hour and teen quenched in water and aged at 850 ℃ for 24 hours.Acicular a_2 phase precipitated in lower solution temperature,slower cooling rate and aging conditions.As the solution temperature,slower cooling rate and fraction of a_2 phase and '0' phase decreases.

关 键 词：Α2相 显微组织 钛合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]