Hostname: page-component-586b7cd67f-rdxmf Total loading time: 0 Render date: 2024-11-25T15:14:26.548Z Has data issue: false hasContentIssue false
  • English
  • Français

Antiphase Domains, Disordered Films and the Ductility of Ordered Alloys Based on Ni3Ai

Published online by Cambridge University Press:  28 February 2011

R. W. Cahn
R. W. Cahn*
Affiliation:
Cambridge University, Dept. of Materials Science & Metallurgy, Pembroke Street, Cambridge CB2 3QZ, England
Get access

Abstract

In elements and intermetallic compounds alike, tensile ductility is favoured by a small spacing of obstacles to dislocation movement, whether these obstacles be grain boundaries or other structural features. The evidence for this generalisation is reviewed.

Antiphase domains (APD) form only when Tt is below the freezing temperature, Tf: this isa rule which has not hitherto been recognized. In Ni-Al, Tt < Tf when the Al content is less than ≈23.5at.%. APD's can serve as heterogeneous nuclei where films of disordered (γ) phase deposit. Domains, especially if decorated by γ films, are associated with enhanced ductility, and there is circumstantial evidence that the ductility is indeed caused by these microstructural features.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 81: Symposium H – High-Temperature Ordered Intermetallic Alloys II , 1986 , 27
Copyright
Copyright © Materials Research Society 1987

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Aoki, A., Izumi, O., Nippon Kinzoku Gakkaishi 43, 1190 (1979).Google Scholar
2. Liu, C.T., White, C.L., Horton, J.A., Acta Metall. 33, 213 (1985).CrossRefGoogle Scholar
3. Hack, J.E., Srolovitz, D.J., Chen, S.P., Scripta Metall., in press.Google Scholar
4. Weihs, T.P., Zinoviev, V., Viens, D.V., Schulson, E.M., Acta Metall. 34, in press.Google Scholar
5. Takasugi, T., Izumi, O., Acta Metall. 33, 1247, 1259 (1985).CrossRefGoogle Scholar
6. Inoue, A., Tomioka, H., Masumoto, T., Met. Trans. 14A, 1367 (1983).CrossRefGoogle Scholar
7. Inoue, A., Masumoto, T., Tomioka, H., Yano, N., Int. J. Rapid Solidif. 1, 115 (1985).Google Scholar
8. Huang, S.C., Hall, E.L., Chang, K.-M., LaForce, R.P., Met. Trans. 17A, 1685 (1986).CrossRefGoogle Scholar
9. Armstrong, R.W., in Strength of Metals and Alloys (ICSMA-7-CIRMA) (Pergamon Press, 1985).Google Scholar
10 Schulson, E.M., Res Mechanica Lett. 1, 111 (1981).Google Scholar
11. Ball, A., Bullen, F.P., Henderson, F., Wain, H.L., in Fracture (Proc. 2nd Int. Conf. on Fracture, Brighton, 1969) (Chapman & Hall, London) p. 327.Google Scholar
12. Ball, A., Bullen, F.P., Henderson, F., Wain, H.L., Phil. Mag. 21, 701 (1970).CrossRefGoogle Scholar
13. Cahn, R.W., in Physical Metallurgy, edited by Cahn, R.W. & Haasen, P., (North-Holland Physics Publishers, Amsterdam, 1983), p. 1611.Google Scholar
14. Clapp, M.T., Shi, D., J. Appl. Phys. 57, 4672 (1985).CrossRefGoogle Scholar
15. Cahn, R.W., Siemers, P.A., Geiger, J.E., Bardhan, P., submitted to Acta Metall.Google Scholar
16. Cahn, R.W., Siemers, P.A., Hall, E.L., submitted to Acta Metall.Google Scholar
17. Koch, C.C., Horton, J.A., Liu, C.T., Gavin, O.B., Scarbrough, J.O., in: Proc. 3rd Conf. on Rapid Solidification Processing. Principles and Technologies. III. 1982, edited by Mehrabian, R. (National Bureau of Standards, Gaithersburg, MD, 1983), p. 264.Google Scholar
18. Horton, J.A., Liu, C.T., Acta Metall., in press.Google Scholar
19. Liu, C.T., White, C.L., Horton, J.A., Acta Metall. 33, 213 (1985).CrossRefGoogle Scholar
20. Liu, C.T., in High-temperature Alloys: Theory and Design, edited by Stiegler, J.O. (The Metallurgical Society of AIME, Warrendale, PA, 1984), p. 289.Google Scholar
21. Horton, J.A., Dasgupta, A., Liu, C.T., in High-Temperature Ordered Intermetallic Alloys, (Mat. Res. Soc. Symp. Proc., Vol. 39, 1985), p. 109.Google Scholar
22. Sastry, S.M.L., Lipsitt, H.A., Met. Trans. 8A 1543 (1977).CrossRefGoogle Scholar
23. Lipsitt, H.A., as ref. 21, p. 351.Google Scholar
24. Jackson, A.G., Teal, K.R., Eylon, D., Froes, F.H., Savage, S.J., in Rapidly Solidified Alloys and Their Mechanical and Magnetic Prooerties, (Mat. Res. Soc. Symp. Proc., Vol. 58, 1986), p. 365.Google Scholar
25. Banerjee, D., Williams, J.C., Defence Sci. J. (India) 36, 191 (1986).CrossRefGoogle Scholar
26. Takasugi, T., Izumi, O., Acta Metall. 33, 39 (1985).CrossRefGoogle Scholar
27. Hanada, S., Ogura, T., Watanabe, S., Izumi, O., Masumoto, T., Acta Metall. 34, 13 (1986).CrossRefGoogle Scholar
28. Calvayrac, Y., Fayard, M., Acta Metall. 14, 783 (1966).CrossRefGoogle Scholar
29. Cahn, R.W., Westmacott, K.N., to be published.Google Scholar
30. Hanada, S., Watanabe, S., Izumi, O., J. Mat. Sci. 21, 203 (1986).CrossRefGoogle Scholar