The isothermal section of the phase diagram of the ternary system Y-Mg-Ni at 673 K in the region 50-100 at. percent Ni

摘要

The isothermal section of the phase diagram of the ternary system Y-Mg-Ni (Ni > = 50 percent) was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential thermal analysis (DTA). The isothermal section consists of 13 single-phase regions, 25 two-phase regions and 13 three-phase regions. At 673 K, the existence of two ternary compounds YMgNi_4 (space group F43m, a = 7.1853 nm) and Ymg_2Ni_9 (space group R3m, a = 4.8666(5) nm, c = 23.7733(5) nm) were confirmed. No other ternary compound was found and no solid solubility was observed in this work.