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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.

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

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References

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