Thermodynamic re-assessment of the ternary system Al-Cr-Ni.

A re-assessment of the ternary system AI-Cr-Ni following Dupin's thesis wor k using a single Gibbs energy function for the gamma and gamma' phases is p resented taking into account new experimental liquidus temperatures. The di sordered bcc A2 and ordered B2 phases are also modelled with a single equat ion. The existence of vacancies as defects in this structure is described. The other phases are modelled as substitutional solutions, or as stoichiome tric or non-stroichiometric binary compounds. The present assessment is lim ited to the sub system AlNi-Cr-Ni where no ternary phase exists. The parame ters describing the Gibbs energy of all the assessed phases are given. Exte nsive comparisons between calculation and experimental data are presented.