Assessment of the Cr-B system and extrapolation to the Ni-Al-Cr-B quaternary system

The Cr-B system is re-assessed treating boron as an interstitial element in the disordered solid solution fcc and bcc phases. The binary assessment is in good agreement with the available experimental phase diagram data and thermochemical data. The Cr-B binary assessment is then used in the assessment of the Ni-Cr-B and Al-Cr-B systems. The ternary assessments are in reasonable agreement with the limited experimental data for the systems. Finally, the ternary assessments are combined with the previous ternary assessment of the Ni-Al-B system to extrapolate to the quaternary Ni-Al-B-Cr system.