The polygonal phase and eutectic structure have
been identified to be Al9(Co, Ni)2 phase and Al, Al3(Ni,
Co) and Al9(Co, Ni)2 ternary eutectic, respectively,
according to the Al-Ni-Co ternary phase diagram
combined with X-ray diffraction (XRD) and energy
dispersive spectroscopy (EDS) analysis[17].