Abstract
Experimental data on the Fe-Ni-W phase diagram have been obtained at 1273, 1373, 1473, 1573, and 1673 K by means of the diffusion-couple technique and electron microprobe analysis. These data were combined with selected literature information on the liquidus surface and the complete Fe-Ni-W phase diagram was evaluated. The evaluation was performed by analyzing the experimental data in terms of thermodynamic models for the Gibbs energy of the various phases and by computer-optimizing the model parameters involved. The optimized phase diagram satisfactorily describes the available data.
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