Computation of metastable phases in tungsten-carbon system

Marios D. Demetriou, Nasr M. Ghoniem, Adrienne S. Lavine
2002 Journal of phase equilibria (Print)  
Metastable phase equilibria in the W-C system are presented in the vicinity of the metastable reactions involving W 2 C, WC 1-x , and WC. Metastable phase boundaries were obtained by reproducing the stable boundaries using optimized Gibbs energy formulations and extrapolating them into regions of metastability. Four metastable reactions were obtained: a metastable congruent melting reaction of WC at 3106 K, a metastable eutectic reaction between WC 1-x and graphite at 2995 K, a metastable
more » ... ic reaction between W 2 C and WC at 2976 K, and a metastable eutectic reaction between W 2 C and graphite at 2925 K. The reaction enthalpies and entropies associated with these transitions are also computed using the available Gibbs energy data. Furthermore, possible kinetic paths that could lead to metastability are discussed.
doi:10.1361/105497102770331550 fatcat:ufpben5y4fayff2g7ml5bhq37i