Impact of Si and Mg on Microstructural and Magnetic Behavior of Fe-Co-Ni (Mg-Si)x (x = 0.00,0.1,0.2) Multicomponent Alloys

The multicomponent alloys, namely FeCoNi(Mg-Si) x (x = 0.00,0.1,0.2) were prepared by mechanical alloying (MA) followed by conventional sintering at 900 °C. The impact of magnesium (Mg) and silicon (Si) on the microstructure and magnetic properties of the FeCoNi(Mg-Si) x alloys were examined by a systematic investigation of the phase, microstructure, mechanical and magnetic properties. It was found that the higher molar ratio of Si and Mg content gives rise to the formation of oxides in greater extent in case of FeCoNi(Mg-Si) 0.0 and FeCoNi(Mg-Si) 0.1 alloys. Surface morphology of the multicomponent alloys consists of a well-separated FCC (grey), intermetallic (dark grey) and oxides (black) regions. The Vickers hardness has an approximately linear gain with Si and Mg content. The prepared samples show ferromagnetic nature and the value of maximum saturation magnetization (M s ) of 142.43 emu/g and considerably low H c of 30.29 Oe was found to be in case of FeCoNi(Mg-Si) 0.1 alloy. The correlation between the structural evolution and magnetic properties of multicomponent alloys has been discussed in detail.