近α型TG6高温钛合金中硅化物的沉淀析出行为  

Precipitation Behavior of Silicide in Near-α TG6 Titanium Alloy

作　　者：李娟[1] 蔡建明 段锐[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2012年第5期32-36,共5页Journal of Aeronautical Materials

基　　金：国家重点基础研究发展计划项目(2007CB613803)

摘　　要：采用光学显微镜(OM),透射电镜(TEM)研究了近α型TG6钛合金在不同热处理状态下硅化物的沉淀析出行为。结果表明,硅化物优先在原始β片层上析出,同时,在有些α基体中也有硅化物的析出。硅化物呈现长杆状或椭球状,为六方结构的S2型((TiZr)6Si3)硅化物,与α基体没有确定的取向关系。在透射电镜下可以看出,硅化物分布并不均匀。在600℃热暴露过程中,随着热暴露时间的延长,硅化物的数量增多尺寸增大。析出的硅化物与位错发生交互作用形成位错堆积,可以有效阻碍位错的滑移运动,提高合金强度。The precipitation behavior of silicide in near-alpha TG6 titanium alloy under the different heat treatment states was studied using OM, TEM. The results show that the silicide precipitates asymmetrically along the primary 13 layer or in α matrix. Silicide is HCP S2 type, generally long-rod or ellipsoidal precipitated inhomogeneously. There is no certain orientation relationship between the silicide and α matrix. After a long period thermal exposure at 600℃ , The size and amount of silicide increase with the extension of the heat exposure time. The interactions of silicide and dislocation cause the dislocation accumulation, which can effectively hinder dislocation glide to improve the alloy＇s strength.

关 键 词：TG6钛合金 硅化物 沉淀析出 

分 类 号：TG146.2[一般工业技术—材料科学与工程]