Further comparison of the samples diffractogram with the theoretical metallic phases also reveals some interesting facts. The Ru HCP phase is maintained in all the binary alloys (Ru-Pt, Ru-Pd, Ru-Rh and Ru-Ir). In the ternary alloys (Ru-Pt-Pd), however, an additional facecentered cubic (FCC) phases also appears. The latter is more intense as we move from the ternary to the quaternary alloy (Ru-Pt-Pd-Ir), at the expense of the HCP phase. In HEA mix and HEA Seg, only the FCC phase is detected.