Solidification structures of high niobium containing TiAl alloys

Jingwen Xu, Junpin Lin, Yanli Wang, Zhi Lin, Guoliang Chen

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    Jingwen Xu, Junpin Lin, Yanli Wang, Zhi Lin, and Guoliang Chen, Solidification structures of high niobium containing TiAl alloys, J. Univ. Sci. Technol. Beijing , 12(2005), No. 2, pp.134-138.
    Jingwen Xu, Junpin Lin, Yanli Wang, Zhi Lin, and Guoliang Chen, Solidification structures of high niobium containing TiAl alloys, J. Univ. Sci. Technol. Beijing , 12(2005), No. 2, pp.134-138.
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    Solidification structures of high niobium containing TiAl alloys

    • State Key Laboratory for Advanced Metals and Materials. University of Science and Technology, Beijing 100083, China

    基金项目: 

    This research was sponsored by the State Key Project for Fundamental Research Developing Plan (No.G2000067206-2) and theNational Natural Science Foundation of China (No. 50274005).

      通信作者:

      Junpin Lin E-mail: linjunpin@skl.ustb.edu.cn

    中文摘要

    To understand the effect of alloy stoichiometry on the microstructural development and mechanical behavior of γ-TiAl-based materials, it is necessary to have a determination of the phase relationships for the TiAl alloy system near the γ phase field. Cast structures and phases of Ti-(43-47)Al-8Nb-(1-2)Mn (at%) alloys have been studied by using scanning electron microscope and X-ray diffraction. Their solidification path and microstructure development during the solidification were analyzed. The experimental results show that the alloys with different Al contents form different macrostructures and microstructural morphologies. This indi-cates that the solidification paths are different with different Al contents. The alloy with 43Al forms equiaxed grain structure, and the solidification path is as follows:L→L+β→β→α+β→α+β cores→α2+γ+B2 cores. Whereas the alloy with 47Al forms colum-nar grain structure, and the solidification path is as follows:L→L+β→α+β+L→α+γ+β cores→tXj+γ+BZ cores. The p phase is their primary solid phase and can be retained to ambient temperature. The alloy with 43Al solidifies completely into β phase. The peritectic reactions L+P→α and L+α→γ appear when the Al content increases to 47Al.

     

    Materials

    Solidification structures of high niobium containing TiAl alloys

    Author Affilications

      • State Key Laboratory for Advanced Metals and Materials. University of Science and Technology, Beijing 100083, China

    • Funds: 

      This research was sponsored by the State Key Project for Fundamental Research Developing Plan (No.G2000067206-2) and theNational Natural Science Foundation of China (No. 50274005).

    • Received: 22 December 2003;
    To understand the effect of alloy stoichiometry on the microstructural development and mechanical behavior of γ-TiAl-based materials, it is necessary to have a determination of the phase relationships for the TiAl alloy system near the γ phase field. Cast structures and phases of Ti-(43-47)Al-8Nb-(1-2)Mn (at%) alloys have been studied by using scanning electron microscope and X-ray diffraction. Their solidification path and microstructure development during the solidification were analyzed. The experimental results show that the alloys with different Al contents form different macrostructures and microstructural morphologies. This indi-cates that the solidification paths are different with different Al contents. The alloy with 43Al forms equiaxed grain structure, and the solidification path is as follows:L→L+β→β→α+β→α+β cores→α2+γ+B2 cores. Whereas the alloy with 47Al forms colum-nar grain structure, and the solidification path is as follows:L→L+β→α+β+L→α+γ+β cores→tXj+γ+BZ cores. The p phase is their primary solid phase and can be retained to ambient temperature. The alloy with 43Al solidifies completely into β phase. The peritectic reactions L+P→α and L+α→γ appear when the Al content increases to 47Al.

     

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