The 500 °C isothermal section of the Nd–Al–Ti ternary system

The phase relations in the Nd–Al–Ti ternary system at 500 °C were investigated by powder X-ray diffraction (XRD), differential thermal analysis (DTA), optical microscopy, and scanning electron microscopy (SEM) techniques. The existence of two ternary compounds NdTi2Al20 and Nd6Ti4Al43 were confirmed. The isothermal section of this ternary system consists of 15 single-phase regions, 29 two-phase regions, and 15 three-phase regions. At 500 °C, the maximum solid solubilities of Ti in Nd3Al, Nd2Al, and NdAl2 is about 2.4, 3.5, and 16.1 at.%, respectively, and that of Nd in Ti, Ti3Al, TiAl is less than 1 at.%. [Copyright &y& Elsevier]