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Philosophical Magazine Volume 84, 2004 - Issue 27
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Original Articles

Order–disorder transformation of the O phase in Ti2AlNb alloys

A. K. Singh § Defence Metallurgical Research Laboratory, Kanchanbagh P.O., Hyderabad 500 058, India
,
B. Nageswara Sarma Centre of Advanced Study, Department of Metallurgical Engineering, Banaras Hindu University, Varanasi 221 005, India
&
S. Lele Centre of Advanced Study, Department of Metallurgical Engineering, Banaras Hindu University, Varanasi 221 005, India
Pages 2865-2876 | Received 13 Aug 2003, Published online: 21 Feb 2007
 
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Abstract

The free energy of the O2 (Ti2AlNb) phase, based on the Gorsky–Bragg–Williams (G–B–W) approximation considering nearest-neighbour interactions, has been utilized to derive expressions for the transition and instability temperatures. The relations among the long-range order parameter, transformation temperatures and free energy as a function of the concentrations of Al and Nb have been established. The results are compared with those of earlier experimental and theoretical investigations.

Acknowledgements

A.K.S. is grateful to the Ministry of Defence, Government of India, for providing financial support. We extend our thanks to Dr. D. Banerjee, Director Defence Metallurgical Research Laboratory, Hyderabad, India, for encouraging us to carry out this work.

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