Experimental Phase Diagram of the Al–Mo–Gd Ternary System at 773 K

The nature of the isothermal region of the Al–Mo–Gd ternary system at 773 K has been established by analysis of quenched samples, annealed for 6 weeks, by use of x-ray powder diffraction and scanning electron microscopy equipped with energy-dispersive analysis. Two ternary phases, Al43Mo4Gd6 and Al4Mo2Gd were observed. Ten binary phases, including Al17Mo4 rather than Al4Mo, were present at 773 K in the Al–Mo system. The ranges of homogeneity of the AlMo3 and Al8Mo3 phases were 7.5 and 1 at.%, respectively. According to results obtained from the disappearing-phase method, the maximum solubility of Al in Mo is approximately 16 at.%.