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杨龙川,苏艳,杜宇雷,廖文和.铸态Ti-22Al-25Nb合金的结构特征与力学性能[J].稀有金属材料与工程(英文),2020,49(11):3902~3908.[Yang Longchuan,Su Yan,Du Yulei and Liao Wenhe.Structural features and mechanical properties of as-cast Ti-22Al-25Nb alloy[J].Rare Metal Materials and Engineering,2020,49(11):3902~3908.]
Structural features and mechanical properties of as-cast Ti-22Al-25Nb alloy
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Received:November 26, 2019  Revised:December 17, 2019
DOI:
Key words: Ti-22Al-25Nb  induction floating melting  structural features  mechanical properties
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Yang Longchuan,Su Yan,Du Yulei and Liao Wenhe  
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Abstract:
      Ti2AlNb-based alloy is a kind of intermetallic compound. It is expected to replace Ni-based superalloys for high-temperature structural applications with a temperature range of 650-800 ℃. In this work, a Ti2AlNb based alloy with a nominal composition of Ti-22Al-25Nb is prepared by water-cooled copper crucible induction floating melting method. The structural features of the as-cast Ti-22Al-25Nb alloy are characterized by XRD and SEM. It is found that the main phase of the as-cast Ti-22Al-25Nb alloy can be B2/? phase or O phase, depending on its melting and casting process parameters. The grain size of the as-cast Ti-22Al-25Nb alloy reaches several hundred microns. The mechanical properties of the as-cast Ti-22Al-25Nb alloy are investigated by tensile, compressive and nanoindentation tests at room temperature. The ultimate tensile strength of the as-cast Ti-22Al-25Nb O phase alloy and B2/? alloy reaches 1125 MPa and 1031 MPa respectively, with the elongation of 1.32% and 1.82%. The nanoindentation hardness of the as-cast Ti-22Al-25Nb O phase alloy is slightly higher than that of the as-cast B2/? phase alloy. The tensile fracture and compression fracture of as-cast Ti-22Al-25Nb alloy show obvious cleavage fracture characteristics. In addition, the tensile fracture is mainly intergranular, while the compression fracture is mainly transgranular.