Experimental study and thermodynamic modeling of the Ti–Cu–B system

Abstract

The Ti–Cu–B ternary system has been systematically studied by experimentation and thermodynamically assessed combining the CALPHAD (CALculation of PHAse Diagram) approach and first-principles calculation. Using seven equilibrated alloys, the isothermal section at 1073 K was established by electron probe micro analyzer equipped with wavelength dispersive spectrometer and X-ray diffraction. Differential scanning calorimetry analysis was performed on all the samples to determine the phase transformation temperatures. Primary solidification phases were also identified from the micrographs of the as-cast samples. Based on all the experimental data obtained in this work, the thermodynamic description of the Ti–Cu–B system was reasonably developed and a set of self-consistent thermodynamic parameters was obtained. The calculated isothermal section, vertical section and liquidus projection account for the experimental data satisfactorily.