D0I:10.13374/i.issn1001-053x.1992.02.008 北京科技大学学报 第14卷第2期 Vo1,14No,2 1992年3月 Journal of University of Science and Technology Beijing March 1992 Evaluation of the Potential of the Ternary Aluminides in Nb-Ti-Al system for Hiyh Temperature Application 元 Chne Guoliang(陈国良)·Sun Zuqing(孙祖庆)·Xie Xishan(谢锡善)· Yao Kefu(姚可夫)·Ren Yunrong(任允蓉)·Yang Wangyue(杨王)" ABSTRACT:Being aimed to developing intermetallic base structural materials to be worked at above 1000C,a systematic investigation has been performed of the fundamental crystallographic structure,phase constitution map,density- composition dependence,oxidation resistance and general mechanical behaviour for the ternary intermetallic alloys in the Nb-Ti-Al system.Promissing resu- Its have been obtained at the initial stage in the current program.The 1100C high temperature strength at the strain rate of 10-2/s and 10-/s for the lernary compound Nb'TiAls (y)base alloys are generally much higher than that of the binary compound TiAl (y),especially in the yi+a2 phase region, it is as high as twice as that of TiAl.The densities are 4.1-4.79g/cm3, depending on relative amount of the intermetallics involved and the density difference between the intermetallics.The oxidation resistance at the tempe- rature of 900-1200C of the compound NbTiAls is relatively low but still acceptable.However,by adjusting the relative amount of constituents and adding a small amount of alloying elements it can be singnificantly improved,The room temperature brittleness remains to be solved. KEY WORDS:aluminide,high temperature alloy,Nb-Ti-Al system,evalution Advanced aero-propulsion design now being considered will require materials with high temperature strength,creep resistance,oxidation resistance and ther- momechanical stability,in excess of the range,where nickel based superalloys 1391一10一21收稿 ·材料系(Dept,of Materials Science and Engineering). 157第 卷第 期 年 月 北 京 科 技 大 学 学 报 。 口口甲 一 一 心 ” ‘ 陈 国 良 · 。 。 ‘ 孙 祖 庆 ‘ ‘ 谢 锡 善 ’ 翻匕可 夫 ， 。 。 任 允 蓉 ’ 才 夕 杨王 月 ’ 落 ， ， ， ， ， 一 一 。 ℃ 一 一 ‘ ’ 夕 夕 ， 夕、 住 ， 。 一 。 ” ， 一 ℃ 孟 。 ， 。 ， ， 一 一 ， 一 ， 、 ， ， ， 〕 一 一 收稿 · 材料系 DOI ：10．13374／j ．issn1001－053x．1992．02．008