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    Volume 46, Issue 2 (March 2018)

    Effect of Aluminum Content on Interfacial Reaction of Directionally Solidified TiAl Alloys

    (Received 16 June 2016; accepted 14 December 2016)

    Published Online: 2017

    CODEN: JTEVAB

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    Abstract

    High Nb-containing TiAl alloys with different aluminum content were prepared by vacuum induction casting technology, and then processed via directional solidification in a Y2O3-coated Al2O3 crucible. The effect of aluminum content on the metal and coating interface, chemical composition, and phases at the interfaces were evaluated. The variations of microhardness of the samples from surface to interior were presented. The results showed that there is no significant difference between the matrix structure of TiAl alloy with different aluminum content. Nevertheless, with increasing aluminum content in the melt, the thickness of the reaction layer decreased. Moreover, the elements diffusion distance and hardness also showed an apparent decrease with the increasing of aluminum content. Besides inherent phases in the melt, simultaneous precipitation of Al2O3 particles also occurred.

    Author Information:

    Cheng, C.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,

    Sui, Y.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,

    Feng, K.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,

    Qi, J.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,

    He, Y.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,

    Meng, Q.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,

    Wei, F.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,

    Sun, Z.
    School of Material Science and Engineering, China Univ. of Mining and Technology, Xuzhou,


    Stock #: JTE20160307

    ISSN:0090-3973

    DOI: 10.1520/JTE20160307

    Author
    Title Effect of Aluminum Content on Interfacial Reaction of Directionally Solidified TiAl Alloys
    Symposium ,
    Committee A01