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Structural features and mechanical properties of as-cast Ti-22Al-25Nb alloy
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Affiliation:

School of Mechanical Engineering,Nanjing University of Science and Technology

Clc Number:

TG294

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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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.

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[Yang Longchuan, Su Yan, Du Yulei, 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.]
DOI:10.12442/j. issn.1002-185X.20190991

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History
  • Received:November 26,2019
  • Revised:December 17,2019
  • Adopted:January 03,2020
  • Online: December 09,2020
  • Published: