Thermal, magnetic and magnetocaloric properties of FeErNbB metallic glasses with high glass-forming ability
The comprehensive characteristics of Fe71-xErxNb6B23 (x = 0, 1, 3, 5, 7 at.%) bulk metallic glasses (BMGs), including the thermal properties, glass-forming ability, magnetocaloric effect and mechanical properties were investigated. As a result, with increasing Er content up to 5 at.%, the supercooled liquid region increases to 90 K, and BMG with a critical diameter of 4 mm is fabricated by copper mold casting. The regulation of Curie temperature is achieved by controlling the amount of Er. The resulting glass alloy system exhibits Curie temperature of 340-550 K, magnetic entropy change of 0.74-1.41 J/kg K, and refrigerant capacity of 56-112 J/kg in external magnetic field of 1.5 T. Moreover, the Fe71-xErxNb6B23 BMGs exhibit high saturation magnetic flux density of 0.43-1.09 T, high fracture strength of 3.09-4.65 GPa and high Vickers hardness of 1030-1090 kg/mm2, respectively. Considering these good overall characteristics, this glass alloy system can be employed as magnetic-refrigerant materials in temperature range of 340-550 K.