Isothermal section of the Al-Dy-Ge ternary system at 673 K

The isothermal section of the phase diagram of the Al-Dy-Ge ternary system at 673 K has been investigated by X-ray powder diffraction and scanning electron microscope equipped with energy dispersive X-ray spectroscopy in backscattered electron imaging modes. The existence of thirteen binary compounds including Dy₃Ge₄ in the system Dy-Ge has been confirmed. Four ternary compounds, namely AlDyGe, Al₃Dy₂Ge₄, AlDy₂Ge₃, and AlDy₂Ge₂ were observed, and five new ternary compounds, i.e., Al_0.33DyGe₂, AlDy₂Ge₆, Al₂DyGe₂, AlDy₃Ge₃, and Al_3−xDy₁₁Ge_7+x (x ≤ 0.7), and one pseudo-binary compound Al_3−xDyGe_x were found in this system at 673 K. The maximum solid solubility of Ge in the pseudo-binary compounds Al_3−xDyGe_x is about 7.5 at.% with x = 0.3 at 673 K.