Effects of La on Thermal Stability, Phase Formation and Magnetic Properties of Fe-Co-Ni-Si-B-La High Entropy Alloys

摘要

The microstructure, phase formation, thermal stability and soft magnetic properties of melt-spun high entropy alloys (HEAs) Fe27Co27Ni27Si10-xB9Lax with various La substitutions for Si (x = 0, 0.2, 0.4, 0.6, 0.8, and 1) were investigated in this work. The Fe27Co27Ni27Si10-xB9La0.6 alloy shows superior soft magnetic properties with low coercivity H-c of ~7.1 A/m and high saturation magnetization B-s of 1.07 T. The content of La has an important effect on the primary crystallization temperature (T-x1) and the secondary crystallization temperature (T-x2) of the alloys. After annealing at relatively low temperature, the saturation magnetization of the alloy increases and the microstructure with a small amount of body-centered cubic (BCC) phase embedded in amorphous matrix is observed. Increasing the annealing temperature reduces the magnetization due to the transformation of BCC phase into face-centered cubic (FCC) phase.

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