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Deformation-induced γ → DI-α2 phase transformation occurring in the twin-intersection region of TiAl alloys

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Abstract

Deformation-induced γ → DI-α2 phase transformation was verified to occur in the twin-intersection region of a Ti–45Al–8Nb (at.%) alloy compressed at room temperature. High-resolution image observations of the deformation-induced DI-α2 phase suggested that the orientation relationship between the DI-α2 and γ phases remained the typical one: (0001)DI−α2//{111}γ, [11¯20]DI−α2//〈101]γ. The conversion of stacking sequence from ordered face-centered tetragonal to ordered nonequilibrium hexagonal close-packed structure was accomplished by the movement of a/6〈11¯2] Shockley partial dislocations on every other {111}γ plane. Compositional analysis based on energy dispersive spectra revealed that the DI-α2 phase had the same composition as the matrix γ phase. No compositional diffusion occurred because the plastic deformation was carried out at room temperature. The strong stress concentration in the intersection region was the major force to induce the γ → DI-α2 phase transformation in the process of room-temperature compression.

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Acknowledgments

This research was carried out with support from Natural Science Foundation of China (NSFC) Grant No. 50271073 and the Major State Basic Research Projections of China, Grant No. 2006CB600905. The authors gratefully acknowledge these sources. We would also like to thank the reviewer for beneficial comments and discussions regarding crystallographic aspects of this work.

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Authors and Affiliations

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, People’s Republic of China

    C. L. Chen, W. Lu, L. L. He & H. Q. Ye

  2. Graduate School of Chinese Academy of Sciences, Beijing, 100039, People’s Republic of China

    C. L. Chen & W. Lu

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  1. C. L. Chen
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  2. W. Lu
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  3. L. L. He
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  4. H. Q. Ye
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Correspondence to L. L. He.

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Chen, C.L., Lu, W., He, L.L. et al. Deformation-induced γ → DI-α2 phase transformation occurring in the twin-intersection region of TiAl alloys. Journal of Materials Research 22, 2416–2422 (2007). https://doi.org/10.1557/jmr.2007.0323

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  • DOI: https://doi.org/10.1557/jmr.2007.0323

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