一种稀土改性的先进高温钛合金  

AN ADVANCED ELEVATED TEMPERATURE TITANIUM ALLOY MODIFIED BY A RARE EARTH ELEMENT

作　　者：邓炬[1] 吴之乐[1] 杨冠军[1] 陈杜娟[1] 黄汉良[1] 郑月秋[1] 段文森[1] 罗国珍[1] 

机构地区：[1]西北有色金属研究院

出　　处：《航空材料学报》1990年第1期1-7,共7页Journal of Aeronautical Materials

摘　　要：本文简要介绍了西北有色金属研究院研制的新型高温钛合金 Ti633G 的组织与性能特点。Ti633G 的名义成分为 Ti—6.5Al—3Sn—3Zr—1Nb—0.3Mo—0.2Gd.它是以 IMI829为基础,通过添加少量稀土元素钆(Gd)改性而成的。合金的设计思想着重在搞好蠕变—疲劳—热稳定性的配匹,获得良好的综合性能.添加0.2Gd 可使 IMI829合金的平均β晶粒尺寸由500μm减小到100μm,并抑制高温下β晶粒长大。Ti633G 中存在三种结构的 Gd_2O_3氧化物粒子和 S_2型硅化物——(TiZr)_6Si_3粒子.将 Ti633G 与 IMI829合金的拉伸、蠕变、疲劳和热稳定性进行了对比,并讨论了 Gd 在高温钛合金中的作用。Ti633G 是在航空发动机上应用的“本质细晶粒的”先进高温钛合金,使用温度可达550℃。This article briefly introduces the characteristics of microstructure and properties of a new elevated temperature titanium alloy-Ti-633G,developed by Northwest Institute for Non-ferrous Metal Research(NINMR).The nominal composition of Ti-633G alloy is Ti-6.5Al-3Sn-3Zr-1Nb-0.3Mo-0.2Gd.The alloy Ti-633G was developed by adding a small amount of rare-earth element ga- dolinium (Gd) based on IMI829 alloy.The alloying design was placed emphasis on an optimized balance among creep resistance,post-creep stability and fatigue properties.Ti-633G is a near-alpha alloy.Added 0.2wt% Gd into IMI829 alloy enable β average grain size to decrease from 550μm to 100μm,and restrain the grain growth at high temperatures.There are three kinds of Gd_2O_3 structures and S_2-type silicide——(Ti,Zr)_6Si_3.In the paper,the tensile properties,creep resistance,fatigue properties and post-creep stadility of Ti-633G were compared with those of IMT829.The roles of rare-earth element Gd in elevated temperatu- re titanium alloys were discussed.Ti-633G is an“inherent fine grain”elevated temperature titanium alloy,which can be used in gas turbine engine up to about 550℃.

关 键 词：钛合金 高温合金 稀土 钆 改性 

分 类 号：V252.2[一般工业技术—材料科学与工程]