Effect of C and Ce addition on the microstructure and magnetic property of the mechanically alloyed FeSiBAINi high entropy alloys

The effects of elemental addition, C and Ce, on the microstructure, thermal property and magnetic property of mechanically alloyed FeSiBAINi (based-W5) high entropy alloys (HEAs) have been investigated in depth in the present work. The amorphous HEAs have been successfully fabricated by mechanical alloying. The results reveal that Ce addition obviously shortens the formation time of fully amorphous phase, therefore leading to the enhanced glass forming ability (GFA) of the based-W5. The final products of as-milled FeSiBAINiC alloy consist of the main amorphous phase and a small amount of Si nanocrystals. In addition, C and Ce addition are both beneficial to enhance the thermal stability. The coercivity force (H-c) of the tested samples lies in the range of 50-378 Oe, suggesting the semi-hard magnetic property. The saturation magnetization (M-s) becomes decreased with increasing the milling time. C addition effectively increases M-s exhibiting the good magnetic property, however, Ce addition presents the negative effect. It should be noted that the amorphous phase tends to be formed when the radius ratio (R-r) is larger than 1, and the GFA is enhanced with increasing R-r and valence electron concentration. (C) 2016 Elsevier B.V. All rights reserved.