Compositional optimization of advanced high temperature titanium alloys under guidance of phase diagram and diffusion theory
The alloying characterizations and principles of high temperature titanium alloys were evaluated in terms of Al equivalent and Mo equivalent. The effects of refractory B stabilizer on solution strengthening and stabilizing role of a-Ti and B-Ti were compared accord ing to Ti-Mp binary phase diagrams.With respect to the important role of diffusion on high temperature creep property for titanium alloys,the diffusion rate of various alloying element in the a-Ti and B-Ti and the effect of various alloying element on the self-diffusion rate of a Ti were studied.Based on the research results,the Equivalent Design Criterion for 600℃ high temperature titanium alloy is proposed,the optimized Al and Mo equivalent values are determined,the Al equivalent is 8.5% -9% and the Mo equivalent is 0.5% -1 %.In order to further improve the creep and fatigue properties of an advanced titanium alloy developed for use as high pressure compressor discs and blades operated at the intended service temperature above 600℃ ,a novel B-stabilizer combination Nb plus Ta is recommended and a new 600℃ titanium alloy TG6 (Ti-5.8A1-4Sn-4Zr-0.7Nb-1.5Ta-0.4Si-0.06C) was designed. TG6 alloy has a good balance of strength,ductility,creep resistance and fatigue property.
high temperature titanium alloys phase diagram diffusion mechanical properties
CAI Jianming HUANG Xu MA Jimin CAO Chunxiao
Beijing Institute of Aeronautical Materials,Beijing 100095,China
国际会议
The 10th China-Russia System on Advanced Materials and Technologies(第十届中俄新材料新工艺研讨会)
浙江嘉兴
英文
238-241
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）