Compositional Design of Soft Magnetic High Entropy Alloys by Minimizing Magnetostriction Coefficient in (Fe0.3Co0.5Ni0.2)100−x(Al1/3Si2/3)x System

Abstract

Developing cost-effective soft magnetic alloys with excellent mechanical properties is very important to energy-saving industries. This study investigated the magnetic and mechanical properties of a series of (Fe0.3Co0.5Ni0.2)100−x(Al1/3Si2/3)x high-entropy alloys (HEAs) (x = 0, 5, 10, 15, and 25) at room temperature. The Fe0.3Co0.5Ni0.2 base alloy composition was chosen since it has very the smallest saturation magnetostriction coefficient. It was found that the (Fe0.3Co0.5Ni0.2)95(Al1/3Si2/3)5 alloy maintains a simple face-centered cubic (FCC) solid solution structure in the states of as-cast, cold-rolled, and after annealing at 1000 °C. The alloy after annealing exhibits a tensile yield strength of 235 MPa, ultimate tensile strength of 572 MPa, an elongation of 38%, a saturation magnetization (Ms) of 1.49 T, and a coercivity of 96 A/m. The alloy not only demonstrates an optimal combination of soft magnetic and mechanical properties, it also shows advantages of easy fabrication and processing and high thermal stability over silicon steel and amorphous soft magnetic materials. Therefore, the alloy of (Fe0.3Co0.5Ni0.2)95(Al1/3Si2/3)5 holds good potential as next-generation soft magnets for wide-range industrial applications.

Magnetic, electrical and mechanical properties of Fe40Mn40Co10Cr10 high entropy alloy

“…Based on the extensive review of Gao et al . , the magnetic coercivity values reported for high entropy alloys fall into the category of soft to semi-hard magnetic materials 3 , 40 , 41 , and the values reported here fall into the category of semi hard-magnetic materials. It has been long realized that in magnetic alloys, the intrinsic defect structure, grain size and inclusions, and composition of the alloy have substantial effect on the coercivity of the material 42 .…”

Preternatural Hexagonal High-Entropy Alloys: A Review

“…At present, studies on the magnetic properties of HEAs mainly focus on the soft magnetic properties of alloys with FCC, BCC, or amorphous structures [44][45][46][47][48]. Soft magnetic materials are those which can easily magnetize and demagnetize under a relatively weak magnetic field, and high-entropy alloys have drawn much attention for their especially low coercivity and saturation magnetization.…”

Mechanical and Magnetic Properties of the High-Entropy Alloys for Combinatorial Approaches

“…Nowadays, most of the electronics and computational devices facilitate magnetism and magnetic materials as the smart functional materials [71]. The excellent mechanical properties of high-entropy alloys can improve the reliability of these modern devices [72][73][74].…”

“…Coercive force vs. yield strength for conventional alloys (encircled by dashed lines) and HEAs (colored regions encircled by solid lines). (Data taken from[5,27,29,33,43,44,72,76,77,79,80]). The data is from the CES EduPack 2009, Granta Design, Limited, Cambridge, UK, 2009.Crystals 2020, 9, x FOR PEER REVIEW 12 of Coercive force vs. yield strength for conventional alloys (encircled by dashed lines) and HEAs (colored regions encircled by solid lines).…”