Ti-15Mo-2.7Nb-3Al-0.2Si高强钛合金的相变  

Phase Transformation in Ti 15Mo 2 7Nb 3Al 0 2Si High Strength Titanium Alloy

作　　者：沈桂琴[1] 徐斌[1] 彭益群[2] 脱祥明[2] 

机构地区：[1]北京航空航天大学 [2]北京有色金属研究总院

出　　处：《材料工程》1999年第3期19-23,共5页Journal of Materials Engineering

摘　　要：利用透射、扫描电镜及Ｘ－射线衍射分析较系统地研究了Ｔｉ－１５Ｍｏ－２．７Ｎｂ－３Ａｌ－０．２Ｓｉ钛合金中亚稳β相在时效过程中的分解特性，并建立了相应的时效动力学转变图。研究结果表明，在５００℃以上时效，β相直接析出次生α相，该温度以下，先析出ω过渡相，再逐步过渡到平衡α相。最后，对该合金的时效硬化效应及硅化物沉淀特性也进行了讨论。The precipitation behaviors of metastable β phase during aging in Ti 15Mo 2 7Nb 3Al 0 2Si alloy were systematically studied by using TEM, SEM and X Ray diffraction analysis The kinetic diagram of aging transformation was established also Research results show that α phase is directly precipitated from β matrix during aging above 500℃ and ω phase is prior formed below this aging temperature ω phase gradually transits to α equilibrium phase in subsequent aging Finally, the aging hardening effect and formation of silicide in this alloy are discussed

关 键 词：钛合金 相变 时效硬化效应 硅 化学成分 

分 类 号：TG146.23[一般工业技术—材料科学与工程]