Strain ordering in BCC metals and the associated anelasticity

Dattagupta, S. ; Balakrishnan, R. ; Ranganathan, R. (1982) Strain ordering in BCC metals and the associated anelasticity Journal of Physics F: Metal Physics, 12 (7). pp. 1345-1362. ISSN 0305-4608

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The BCC to BCT transformation is thought to occur as a consequence of strain ordering due to the interaction between impurity interstitials. A Hamiltonian is given which involves the interaction energies between the strain fields of the interstitials belonging to three distinct sublattices. In the BCT phase, one of the sublattices is preferentially occupied. The free energy of the system is calculated in the mean field approximation. In this, the BCC to BCT transformation is found to be a first-order transition at a temperature Tp that is proportional to the concentration of the interstitials and certain basic interaction parameters. The anelastic behaviour of the interacting interstitials is then studied in the region T > Tp. From the anelastic strain, which is proportional to the order parameter associated with the phase transition, the static compliance is obtained. The latter obeys a Curie-Weiss type of law. The creep function, which determines the response to a constant applied stress, is found to exhibit viscous behaviour near Tp. From the creep function, the frequency dependent compliance and the internal friction are evaluated. The results predict a shift and a broadening of the internal friction peak as Tp is approached from above. The features show qualitative resemblance with the recent data on Ta-O.

Item Type:Article
Source:Copyright of this article belongs to Institute of Physics Publishing.
ID Code:9208
Deposited On:29 Oct 2010 11:22
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