It is meaningful toe arry o ut s tudy one ffect o f microstructure and interstitial c ontent on cryogenic properties of these two near a titanium alloys and will promote the application of newly developed alloys in cryogenic engineering 开展显微组织以及间隙元素含量对近钛合金低温性能影响的研究，对促进我国自创的低温钛合金系列材料在低温工程中的推广和应用具有重要意义。
