摘要
研究了Ｔｉ－４４．９Ａｌ（ａｔ－％）合金和Ｔｉ－４４．３Ａｌ－３Ｃｒ（ａｔ－％）合金的室温拉伸断裂过程。结果表明，Ｃｒ提高了合金的塑性。塑性的提高与含Ｃｒ合金含有更多的γ－ＴｉＡｌ相和形成由细晶γ和α＿２＋γ细晶组成的双重组织有关。Ｃｒ促使块状α＿２和β２相的形成，对阻碍γ相上的长程滑移有明显的作用。进一步细化铸态晶粒或制备具有片状α＿２＋γ组织的单晶合金是发展铸造α＿２＋γ合金的目标。
In this article,the tensile fractured process of Ti-44. 9Al(at-%)and Ti-44. 3Al-3Cr(at-%)alloys hasbeen investigated. The results showed that Cr increased ductility of alloys. Improvement of ductility for Cr-bearing alloy is related to the formation of larger amount of γ-TiAl phase and duplex structure consistingof fine grain γ and α2 +γ.Cr promotes formation of the block-shaped α2 and β2 phases which impedes thelong-distance slipping for γ phase obviously, Refining as-cast grains further or preparing single alloy withlamellar structure of α2+γ are target of development of cast α2+γ alloys.
出处
《航空材料学报》
CAS
CSCD
1994年第1期17-26,共10页
Journal of Aeronautical Materials
基金
加拿大自然科学与工程委员会资助项目
关键词
金属间化合物
拉伸断裂
Ti-Al intermetallic compounds,Effect of Cr,Tensile fracture.
