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Application of the cluster/site approximation to fcc phases in the Ni–Al–Cr–Re system

✍ Scribed by J. Zhu; W. Cao; Y. Yang; F. Zhang; S. Chen; W.A. Oates; Y.A. Chang

Publisher
Elsevier Science
Year
2007
Tongue
English
Weight
226 KB
Volume
55
Category
Article
ISSN
1359-6454

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✦ Synopsis

The cluster/site approximation (CSA) has been used to model the face-centered cubic (fcc) phases (disordered c with the A1 structure and ordered c 0 with the L1 2 structure) in the Ni-Al-Cr-Re quaternary system. The CSA takes into account short-range order (SRO), which is vital for describing order/disorder transitions. The approximation possesses computational advantages over the cluster variation method while offering comparable accuracy in the calculation of multi-component phase diagrams. The CSA-calculated phase diagrams are in good accord with the experimental data. In addition, the fcc metastable phase diagrams calculated by using the CSA show the expected ordering/disordering behavior and phase relationships.

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