Isothermal sections at 500 deg C of the Dy-V-Al and Dy-Cr-Al systems in the aluminium rich regions

X-ray diffraction and microscopic analyses have been used to investigate the ternary system dysprosium-vanadium-aluminium in the aluminium rich region. In the system Dy-V-Al two ternary compounds have been found: DyV2Al20 (cubic structure, CeCr2Al20 type, a=14.54 A and approximately DyVAl8 (hexagonal crystal system, structure unknown, a=10.86, c=17.71 A, c/a=1.631). In the system dysprosium-chromium-aluminium three ternary compounds have been found: DyCr2Al20 (cubic structure, CeCr2Al20 type, a=14.39), approximately equal to DyCrAl8) hexagonal crystal system, structure type unkown a=10.75, c=17.60 A, c/a=1.637) and DyCr4Al8 (tetragonal structure, CeMn4Al8 type, a=8.87, c=5.04 A, c/a=0.568). Isothermal sections of the systems Dy-V-Al and Dy-Cr-Al have been plotted at 500 deg C