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朱郎平,路新,南海,曲选辉.Ti-20Al-22Nb合金的凝固组织转变及力学行为[J].稀有金属材料与工程(英文),2020,49(10):3460~3464.[Zhu Langping,Xin Lu,Hai Nan and Xuanhui Qu.Transformation of Solidified Structure and Mechanical Behavior of Ti-20Al-22Nb Alloy[J].Rare Metal Materials and Engineering,2020,49(10):3460~3464.]
Transformation of Solidified Structure and Mechanical Behavior of Ti-20Al-22Nb Alloy
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Received:September 29, 2019  Revised:October 27, 2019
Key words: Ti3Al, cast, heat  treatment, microstructure, tensile  property
Foundation item:国防基础科研项目(项目号JCKY2017213B004),国家自然科学基金(项目号E050804)
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Zhu Langping,Xin Lu,Hai Nan and Xuanhui Qu  
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      Ti-20Al-22Nb (at%) alloys were prepared by investment casting. The microstructures and tensile properties at room temperature of as-cast, hot isostatic pressing and annealed alloys were analyzed. The results show that solidified alloy has course widmanstatten structure, which consists with β matrix, fine acicular α2 phase and a small amount of O phase. The phase transformation inside original β/B2 grain was incomplete owing to non-equilibrium solidification. The loose defect and inhomogeneity of microstructures causes low plasticity of the material. The porous defects are eliminated by hot isostatic pressing in the two-phase region ofα2+β/B2. , peritectoid reaction of β/B2+α2→O promotes the formation of ring O phase around strip α2 phase, and β phase path through a process of equilibrium state transportation. The elongation of the alloy increases from 2% to 5%. Increase to 11%.