Abstract
Phase relationships in the Al-Mn-Dy ternary system at 500 °C have been investigated by X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy, and electron probe microanalysis. From the experimental results it was concluded that the isothermal section consists of 16 single-phase regions, 26 two-phase regions and 12 three-phase regions. Two extensive solid solutions, (AlxMn1−x)12Dy and (Al1−xMnx)2Dy, were observed. The solid solution (AlxMn1−x)12Dy forms by Al replacing Mn in Mn12Dy, while the continuous solid solution (Al1−xMnx)2Dy forms by Mn and Al mutually substituting in Al2Dy and Mn2Dy, respectively. The maximum solid solubility of Al in Mn12Dy is 79.3 at.%.
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