摘要
研究了铸造Ｔｉ－４７Ａｌ－ＸＲｕ（ａｔ％）（Ｘ＝０．５，１，３）合金的显微组织。结果表明，Ｒｕ与Ｃｒ相似，是很强的β稳定元素，促进β２相形成。β２相是含Ｒｕ量高达１０ａｔ％的富Ｒｕ相。含１ａｔ％Ｒｕ的合金在１１６０～１２００℃温度范围热处理时不断析出粒状次生β２相，破坏了γ＋α２片状组织，同时形成了新的γ晶粒。经１２００℃，４８ｈ处理后可得到平均晶粒尺寸小于６０μｍ的γ晶，因此，Ｔｉ－４７Ａｌ－１Ｒｕ合金是可热处理细化晶粒的铸造合金。当Ｒｕ量增加至３ａｔ％时，合金难于热处理细化晶粒，而且合金明显脆化。
Microstructure of cast Ti 47Al XRu(at%) alloy with X=0.5,1 or 3 has been investigated.The results showed that elements Ru and Cr have similar behavior:they are strong β phase stabilizer and promote the formation of β 2 phase.This phase is a Ru riched phase and content of Ru in β 2 phase is more than 10at%.In the alloy containing 1at% Ru the grained secondary β 2 phase continuously precipitated during heat treatment of 1160～1200℃ temperature range,therefore the γ+α 2 lamellar structure was interrupted and the new γ grains formed.The γ grains with average grain size less than 60μm obtained after treatment of 1200℃ for 48h.That means Ti 47Al 1Ru alloy is a finable grain cast alloy by heat treatment.As the content of Ru in alloys increases to 3at%,it is difficult to refine the grains of cast alloy by heat treatment,moreover alloy obviously becomes brittle.
出处
《航空材料学报》
EI
CAS
CSCD
1999年第1期17-21,共5页
Journal of Aeronautical Materials
基金
航空科学基金
