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Toughening of Intermetallics by Coated Ductile Reinforcements

  • H. E. Deve (a1), A. G. Evans (a1) and R. Mehrabian (a1)

Abstract

The effects of reinforcement debonding and work hardening on ductile reinforcement toughening of γ-TiAl have been examined. Debonding has been varied by either the development of a brittle reaction product layer or by depositing a thin oxide coating between the reinforcement and matrix. The role of work hardening has been explored by comparing Nb reinforcements that exhibits high work hardening with solution hardened Ti-Nb alloy that exhibits negligible work hardening. It is demonstrated that a high work of rupture is encouraged by extensive debonding when the reinforcement exhibits high work hardening. Conversely, debonding is not beneficial when the reinforcement exhibits low work hardening.

Copyright

COPYRIGHT: © Materials Research Society 1990

References

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[1] Sigl, L. S., Evans, A. G., Mataga, P., McMeeking, R. M. and Dagleish, B. J., Acta Metall., 36 946, (1988).
[2] Ashby, M. F., Blunt, F. J. and Bannister, M., Acta Metall., 37, 1847, (1989).
[3] Cao, H. C., Dalgleish, B. J., Déve, H. E., Elliott, C., Evans, A. G., Mehrabian, R. and Odette, G. R., (in press), Acta Metall.
[4] Elliott, C. K., Odette, G. R., Lucas, G. E. and Sheckard, J. W., MRS Proceedings, vol 120, p. 95, (1988).
[5] Krstic, V. D., Phil Mag., A 48, 695, (1983).
[6] Budiansky, B., Amazigo, J. C. and Evans, A. G., J. Mech. Phys. Solids, 36 167, (1988).
[7] Evans, A. G. and McMeeking, R. M., Acta Metall., 34, 2435, (1986).
[8] Mataga, P. A., Acta Metall., (in press).
[9] Odette, G. R., Elliott, C. K., Lucas, G. E. and Sheckhard, J. W., to be published.
[10] Dalgleish, B. J., Trumble, K. and Evans, A. G., Acta Metall., 37, 1923, (1989).
[11] Dève, H.E., Evans, A.G., Odette, G.R., Mehrabian, R., Emiliani, M.L., Hecht, R., to be published.
[12] Mader, W. and Riihle, M., Acta Metall. 37, 853, (1989).
[13] Tressler, R. E., Moore, T. L. and Crane, R. L., J. of Mat. Sci., 151, (1973).
[14] Charalambides, P. G., Lund, J., Evans, A. G. and McMeeking, R. M., 1. of Appl. Mech., 56,77, (1989).
[15] Zok, F. and Hom, C., to be published.
[16] Zok, F., Jansson, S., Evans, A. G. and Nardonne, V., to be published.
  • Cited by 4

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Toughening of Intermetallics by Coated Ductile Reinforcements

  • H. E. Deve (a1), A. G. Evans (a1) and R. Mehrabian (a1)

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