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Phase Stability of β-Ti Phase in the TiAl Alloys with the Combined Addition of M Elements

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Abstract

Phase equilibria among the β-Ti, α-Ti and λ-TiAl phases were examined at 1473 K, in order to reveal the M/Nb ratio dependence of the relative phase stability of β phase in the Ti-AlNb-M (M: V, Cr, Mo) quaternary systems. In all of the quaternary systems, the expansion of β phase region toward the lower (Nb+M) content side is observed due to the existence of negative interaction to stabilize the β phase between the third and fourth elements (i.e. Nb-V, Nb-Cr and Nb-Mo). Composition dependence of the interaction is quantified as a function of the M/(Nb+M) ratio at 42 at.% Al. The strong interaction energy existing between the different group elements should be taken into account to design the multi-component TiAl alloys.

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Acknowledgements

Part of this study is supported by Grant-in-Aid for Science Research (B) (No. 23360301) from Japan Society for the Promotion of Science (JSPS) and “Cross-Ministerial Strategic Innovation promotion Program (SIP)”, Innovative Structural Materials, (c) Heat-resistant Alloys and Intermetallics from Cabinet office, Japan.

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Authors and Affiliations

  1. Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, Japan

    Hirotoyo Nakashima & Masao Takeyama

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  1. Hirotoyo Nakashima
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  2. Masao Takeyama
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Nakashima, H., Takeyama, M. Phase Stability of β-Ti Phase in the TiAl Alloys with the Combined Addition of M Elements. MRS Online Proceedings Library 1760, 211–216 (2014). https://doi.org/10.1557/opl.2015.187

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