Lamellar Interfaces and Their Contribution to Plastic Flow Anisotropy in TiAl-Based Alloys


Lamellar γ/α2 TiAl deforms much more easily in the plane of the lamellae (soft mode) than across the lamellae (hard mode). This plastic anisotropy is caused by the soft mode being softer and the hard mode being harder than in monolithic TiAl. The suggested explanations are that the y phase is softened by interstitial gettering, that an extra soft mode exists because superdislocations can channel along interfaces and that the hard mode is dominated by the Hall-Petch effect.

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  1. 1.

    T. Fujiwara, A. Nakamura, M. Hososmi, S.R. Nishitani, Y. Shirai and M. Yamaguchi, Phil. Mag. A, 61, No. 4, 591, (1990)

    CAS  Article  Google Scholar 

  2. 2.

    H. Inui, M.H. Oh, A. Nakamura and M. Yamaguchi, Acta. Met., 40, (11) 3095, (1992)

    CAS  Article  Google Scholar 

  3. 3.

    Y. W. Kim, J. Metals, 41, No. 7, (1989)

    Google Scholar 

  4. 4.

    E.L. Hall and S.C. Huang, J. Mat. Res., 4, 595, (1989).

    CAS  Article  Google Scholar 

  5. 5.

    R.D. Reviere, B.F. Oliver and D.D. Bruns, Mat. & Manufacturing Proc, 4, (1) 103, (1989)

    Article  Google Scholar 

  6. 6.

    Y. Minonishi, Phil. Mag., 63, (5) 1085, (1991)

    CAS  Article  Google Scholar 

  7. 7.

    V.K. Vasudevan, M.A. Stucke, S.A. Court and H.L. Fraser, Phil. Mag. Lett. 59, 299, (1989)

    CAS  Article  Google Scholar 

  8. 8.

    Y.S. Yang and S.K. Wu, Scripta Met., 24, 1801, (1990) Phil. Mag. A65, 15, (1992).

    CAS  Article  Google Scholar 

  9. 9.

    P.M. Hazzledine, B. Kad, D.M. Dimiduk and H.L. Fraser, MRS Conf. Proc. 273, 81, (1992)

    CAS  Article  Google Scholar 

  10. 10.

    B.K. Kad and P.M. Hazzledine, Phil. Mag. Lett. 66, 133, (1992)

    CAS  Article  Google Scholar 

  11. 11.

    Y. Umakoshi, T. Nakano, and T. Yamane, Mat. Sci. Eng., A152, 81, (1992).

    CAS  Article  Google Scholar 

  12. 12.

    Y. Umakoshi, T. Nakano, and T. Yamane, Scripta Met. 25 (7) 1525, (1991).

    CAS  Article  Google Scholar 

  13. 13.

    B.K. Kad. S. Swaminathan and H.L. Fraser. unoublished results.

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PMH acknowledges support from USAF contract no. F33615-91-C-5663. BKK acknowledges stimulating exchanges with Dr. Robert Asaro, Dr. Richard Beanland and Dr. Pavan Nagpal.

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Kad, B.K., Hazzledine, P.M. & Fraser, H.L. Lamellar Interfaces and Their Contribution to Plastic Flow Anisotropy in TiAl-Based Alloys. MRS Online Proceedings Library 288, 495–500 (1992).

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