TiAl+Nb系中γγ1相的有序化转变

王金国, 陈国良, 叶恒强

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    Cite this article as:

    WANG JINGUO, CHEN GUOLIANG, and YE HENGQIANG, ORDERING TRANSFORMATION OF γ TO γ1 IN TiAl+Nb SYSTEM, J. Univ. Sci. Technol. Beijing , 2(1995), No. 1, pp.1-6.
    WANG JINGUO, CHEN GUOLIANG, and YE HENGQIANG, ORDERING TRANSFORMATION OF γ TO γ1 IN TiAl+Nb SYSTEM, J. Univ. Sci. Technol. Beijing , 2(1995), No. 1, pp.1-6.
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    TiAl+Nb系中γγ1相的有序化转变

    基金项目: 

    国家自然科学基金资助项目

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    • 中图分类号: TG449.4

    利用一系列不同Nb含量的TiAl合金研究了该体系的相关系及组织特征。在含有20at%Nb的合金中发现1个新的γ1相。在含有11at%Nb的TiAl合金中,由于Nb原子的进一步有序化,在衍射图上出现Ll0结构的超斑点。在具有过化学计量比Al含量的TiAl合金中,随着合金中Nb含量增加,Nb不断地取代Ti,合金由Ll0结构转变为进一步有序化的γ1相,是一个连续有序化过程。并讨论了可能的转变特征。

     

    ORDERING TRANSFORMATION OF γ TO γ1 IN TiAl+Nb SYSTEM

    Author Affilications
    • Funds: 

      This work is partly supported by the National Nature Science Foundation of China (NNSFC) and the National Advanced Materials Committee of China (NAMCC).

    • Received: 11 September 1994;
    A series of TiAl+Nb alloys with various Nb contents has been employed to explore phase relationship and the evolution of microstructure.A new ordered γ derivative (γ1) has been observed in the alloy containing 20 at% Nb.The additional diffraction spots added to the diffraction pattern of L10 (TiAl) structure have been found in the alloy containing Nb up to 11 at% in terms of further ordering.The transformation from L10 (TiAl) structure to the further ordering phase,γ1,is a continuous ordering process with the substitution of Nb atoms for Ti atoms in alloys with over-stoichiometric Al content of TiAl.The possible transformtion characterzation has been discussed.

     

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