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An investigation of the Ni5Al3 phase

Published online by Cambridge University Press:  31 January 2011

P. S. Khadkikar  and
K. Vedula
P. S. Khadkikar
Affiliation:
Department of Metallurgy and Materials Science, Case Western Reserve University, Cleveland, Ohio 44106
K. Vedula
Affiliation:
Department of Metallurgy and Materials Science, Case Western Reserve University, Cleveland, Ohio 44106
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Abstract

The crystallography of the phases obtained by heat treating a Ni-34.7 at. % Al alloy with 0.9 at. % Hf and 0.04 at. % B was studied in detail using x-ray diffraction techniques. Particular emphasis was placed on characterizing the Ni5Al3 phase, which is obtained by quenching the B2 NiAl phase and aging the resultant martensite. The structure of the Ni5Al3 phase is confirmed to be orthorhombic with space group D192h (Cmmm) and lattice parameters of a0 = 0.7475 nm, b0 = 0.6727 nm, and c0 = 0.3732 nm. The transformation from B2 NiAl to L10 martensite is shown to involve a Bain distortion of the c/a ratio from 0.707 to 0.853, and the further ordering transformation to Ni5Al3 involves a further increase of this c/a ratio to 0.900.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 2 , April 1987 , pp. 163 - 167
Copyright
Copyright © Materials Research Society 1987

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References

REFERENCES

1Enami, K. and Nenno, S., Trans. Jpn. Inst. Met. 19, 571 (1978).CrossRefGoogle Scholar
2Robertson, I. M. and Wayman, C. M., Metallography 17, 43 (1984).Google Scholar
3Singleton, M. F., Murray, J., and Nash, P., submitted to Bull. Alloy Phase Diagrams.Google Scholar
4Litvinov, V. S. and Archangel'skaya, A. A., Phys. Met. Metallogr. 43, (5), 127 (1977).Google Scholar
5Robertson, I. M. and Wayman, C. M., Philos. Mag. A 48, 443 (1983).Google Scholar
6Khadkikar, P. S., Vedula, K., and Shabel, B. S., in the Proceedings of the Materials Research Society Symposium on High Temperature Ordered Intermetallic Alloys, Boston, MA, 1-6 December 1986 (to be published).Google Scholar
7Miller, M. K. and Horton, J. A., Scr. Metall. 20, 1125 (1986).Google Scholar