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The Ductility of Stoichiometric and Ni-Rich Polycrystals of Ni3Al: The Effect of Strain Rate

Published online by Cambridge University Press:  15 February 2011

E. M. Schulson  and
Y. Xu
E. M. Schulson
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
Y. Xu
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
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Abstract

Polycrystals of stoichiometric Ni3Ai are brittle in air at room temperature, at least at strain rates from 10-4 s-1 to 7 s-1. This is indicative of intrinsic brittle behavior. Nickel-rich (Ni24A1) polycrystals, on the other hand, undergo a brittle-to-ductile transition upon raising the strain rate to above about 10-2 s-1. It is argued that the transition reflects the suppression of environmental embrittlement, not of the intermetallic per se but of a Ni-rich solid solution that decorates the grain boundaries of the off-stoichiometric alloy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 425
Copyright
Copyright © Materials Research Society 1997

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References

REFERENCES

1. George, E. P., Liu, C. T. and Pope, D. P., Acta mater. 44, 1757 (1996).Google Scholar
2. George, E. P., Liu, C. T. and Pope, D. P., Scripta metall. mater. 27, 365 (1992).Google Scholar
3. Liu, C. T., Scripta metall. mater. 27, 25 (1992).Google Scholar
4. George, E. P., Liu, C. T. and Padgett, R. A., Scripta mat. 23, 979 (1989).Google Scholar
5. Kraznowski, J. E., Scripta mat. 23, 1219 (1989).Google Scholar
6. Baker, I., Schulson, E. M., Michael, J. R. and Padgett, R. A., Colloque de Physique 51, Cl–77 (1990).Google Scholar
7. Baker, I., Schulson, E. M., Michael, J. R., and Pennycook, S. J., Phil. Mag. B 62, 659 (1990).Google Scholar
8. Kung, H., Rasmussen, D. R. and Sass, S. L., Acta metall. mater. 40, 81 (1992).Google Scholar
9. Kimura, A. and Birnbaum, H. K., Acta metall. mater. 36, 757 (1988).Google Scholar
10. Yao, J., Mequid, S. A. and Cahoon, J. R., Met. Trans. A 24A, 105 (1993).Google Scholar
11. Jung, C. B. and Lee, K. S., Scripta mat. 35, 267 (1996).Google Scholar
12. Dollar, M. and Bernstein, I. M., Acta metall. 36, 2369 (1988).Google Scholar
13. Chen, P. S. and Wilcox, R. C., Met. Trans. 22A, 2031 (1991).Google Scholar
14. Schulson, E. M. and Xu, Y., Acta Mater, (in press)Google Scholar
15. Baker, I., Schulson, E. M. and Michael, J. R., Phil. Mag. B 57, 379 (1988).Google Scholar
16. Schulson, E. M., Weihs, T. P., Baker, I., Frost, H. J., and Horton, J. A., Acta metall. 34, 1395 (1986).Google Scholar
17. Weihs, T. P., Zinoviev, V., Viens, D. V. and Schulson, E. M., Acta metall. 35, 1109 (1987).Google Scholar
18. Schulson, E. M., Xu, Y., Munroe, P. R., Guha, S. and Baker, I., Acta metall, mater. 39, 2971 (1991)Google Scholar
19. Lee, K. H. and White, C. L., Scripta metall. mater. 33, 129 (1995).Google Scholar
20. Baker, I., Klein, O., Nelson, C. and George, E. P., Scripta metall. mater. 30, 863 (1994).Google Scholar
21. Mackenzie, R. A. D., Vaudin, M. D. and Sass, S. L., Proc. MRS 122, 461 (1988).Google Scholar
22. Copley, S. M. and Kear, B. H., TMS-AIME 239, 977 (1967).Google Scholar
23. Von Mises, R., Z. AgnewMath. Mech. 8, 161 (1928).Google Scholar
24. Schulson, E. M., Intermet. Met. Rev. 29, 195 (1984).Google Scholar
25. Schulson, E. M. and Baker, I., Ordered Intermetallics - Physical Metallurgy and Mechanical Behaviour, p. 371, Kluwer Academic Publishers (1992).Google Scholar
26. Frost, H. J., Acta metall. 35, 519 (1987).Google Scholar
27. King, A. H. and Yoo, M. H., Scripta metall. 21, 1115 (1987).Google Scholar
28. Schulson, E. M. and Baker, I., Scripta metall. mater. 25, 1253 (1991).Google Scholar
29. Xu, Y. and Schulson, E. M., Scripta metall. mater. 33, 931 (1995).Google Scholar
30. Xu, Y. and Schulson, E. M., Acta. metall. mater. 43, 2121 (1995).Google Scholar
31. Schulson, E. M., Briggs, L. J. and Baker, I., Acta metall. mater. 38, 207 (1990).Google Scholar
32. Fang, J. and Schulson, E. M., Materials Science and Engineering A152, 138 (1992).Google Scholar