Entropy and free energy at the hcp-bcc transformation temperature in metals and alloys

Ramachandrarao, P. ; Lele, S. (1980) Entropy and free energy at the hcp-bcc transformation temperature in metals and alloys Metallurgical and Materials Transactions A, 11 (11). pp. 1789-1792. ISSN 1073-5623

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Official URL: http://www.springerlink.com/content/w7698854750365...

Related URL: http://dx.doi.org/10.1007/BF02655092

Abstract

It has been shown that a plot of the Φ function, defined by -(Gtr - Go)/Ttr where Gtr and Go are respectively the Gibb’s free energies at the hcp → bcc allotropie transformation temperature(Ttr ) and at absolute zero, vs the entropy (Str) of the hcp phase at Ttr is linear. This concept of the Φ function and its relation to Str can be extended to alloys with the aid of the 'central atoms' solution model. Its use has been demonstrated with respect to the Ti-Zr system where the estimated transformation temperatures are shown to be within the (hcp + bcc) phase field.

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