Computation of Ni-Cr Phase Diagram via a Combined First-Principles Quantum Mechanical and CALPHAD Approach

Metallurgical and Materials Transactions | July 1, 2006| | Copyright

A first-principles quantum-mechanical computational code has been used to compute the energy of formation for selected ordered and topologically close-packed (TCP) phases in a Ni-base alloy. The thermodynamic data are incorporated into an existing database for Ni alloys and used in conjunction with the CALPHAD approach to compute the binary Ni-Cr phase diagram. In addition, a thermodynamic model is used to treat long-range ordering and the formation of the Ni^sub 2^Cr. The phase field for ordering is compared against that predicted by the Thermo-Calc to elucidate possible implications on the ...

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