Phase Analysis of Mg-Si-Ni In-situ Composites

Phase formation in the newly developed Mg-Si-Ni composites was studied. Besides the primary and eutectic in-situ formed Mg2Si phase in the Mg-Si system, a new intermetallic phase was identified in the Ni-containing composites. According to the energy-dispersive spectroscopy (EDS), it was shown that this phase contains Mg, Ni, and Si elements. This revealed that the expected Mg2Ni phase does not form, which was verified based on the X-ray diffraction (XRD) analyses. Through rigorous EDS analysis, the new in-situ formed phase was identified as (Mg,Ni)3Si or more accurately as Mg8Ni7Si5 intermetallic compound, called χ-phase, which has not been reported so far in the Mg-Si-Ni ternary space

کلیدواژه ها:

Magnesium alloys ، Intermetallic compounds ، Microstructure ، Energy-dispersive spectroscopy ، X-ray diffraction