Hostname: page-component-54dcc4c588-nx7b4 Total loading time: 0 Render date: 2025-10-10T04:46:16.187Z Has data issue: false hasContentIssue false
  • English
  • Français

Slip Transfer From γ ' to β Phase in A Ni-Al-Ti Alloy

Published online by Cambridge University Press:  01 January 1992

Rui Yang ,
John A. Leake  and
Robert W. Cahn
Rui Yang
Affiliation:
Cambridge University, Materials Science Department, Cambridge CB2 3QZ, United Kingdom.
John A. Leake
Affiliation:
Cambridge University, Materials Science Department, Cambridge CB2 3QZ, United Kingdom.
Robert W. Cahn
Affiliation:
Cambridge University, Materials Science Department, Cambridge CB2 3QZ, United Kingdom.
Get access

Abstract

Two-phase alloys comprising γ'-Ni3(Al,Ti) and β-Ni(Al,Ti) deform in a non-homogeneous manner at room temperature. Plastic deformation initiates in the softer γ' phase, resulting in internal stresses which build up at the γ'/β phase boundaries. These stresses can be relieved by a number of mechanisms including cracking, void formation, and slip propagating across the boundary into the harder β phase. We have investigated the interaction between mobile dislocations and the γ’/β interface by TEM. We found that compatible deformation occurs at boundaries where a favourable orientation relationship exists between the adjoining phases. In particular, the γ'[011](111) dislocations can be injected into the β phase to become β[100](011) dislocations, leaving residual dislocations at the interfaces. The effect of phase distribution on the operation of this mechanism is analysed, and discussed in relation to the enhancement of ductility of the βphase.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 489
Copyright
Copyright © Materials Research Society 1995

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.)

Article purchase

Temporarily unavailable

References

REFERENCES

1. Brown, L.M. and Stobbs, W.M., Phil. Mag. 23, 1185; 1201 (1971).Google Scholar
2. Pascoe, R.T. and Newey, C.W.A., Metal Sci. J. 2, 138 (1968).Google Scholar
3. Flinn, P.A., Trans. AIME 218, 145 (1960).Google Scholar
4. Forwood, C.T. and Clarebrough, L.M., Phil. Mag. A 44, 31 (1981).Google Scholar
5. Shen, Z., Wagoner, R.H. and Clark, W.A.T., Scripta metall. 20, 921 (1986).Google Scholar
6. Lee, T.C., Robertson, I.M. and Birnbaum, H.K., Ultramicroscopy 29, 212 (1989).Google Scholar
7. Forwood, C.T. and Clarebrough, L.M., Electron Microscopy of Interfaces in Metals and Alloys (Adam Higher, Bristol, 1991), p.336. Google Scholar
8. Hirth, J.P., Metall. Trans. 3, 3047 (1972).Google Scholar
9. Larsen, M., Misra, A., Hartfield-Wunsch, S., Noebe, R. and Gibala, R., in Intermetallic Matrix Composites, edited by Anton, D.L., Martin, P.L., Miracle, D.B. and McMeeking, R. (Mater. Res. Soc. Symp. Proc. 194, Pittsburgh, PA, 1990), pp. 191–198.Google Scholar
10. Yang, R., Saunders, N., Leake, J.A. and Cahn, R.W., Acta metall. mater. 40, 1553 (1992).Google Scholar
11. Ball, C.J., Phil. Mag. A 44, 1307 (1981).Google Scholar
12. Heilmann, P., Clark, W.A.T. and Rigney, D.A., Ultramicroscopy 9, 365 (1982).Google Scholar
13. Hirsch, P.B., Howie, A., Nicholson, R.B., Pashley, D.W. and Whelan, M.J., Electron Microscopy of Thin Crystals (Butterworths, London, 1965).Google Scholar
14. Loretto, M.H. and Wasilewski, R.J., Phil. Mag. 23, 1311 (1971).Google Scholar