Effects of Nb and Mo additions on thermal behavior, microstructure and magnetic property of FeCoZrBGe alloy*

Abstract

Both Nb and Mo additions play a vital role in FeCo-based alloys and it is crucial to understand their roles and contents on thermal behavior, microstructural feature and magnetic property of alloys. Nanocrystalline alloy ribbons Fe40Co40Zr9 – y M y B10Ge1 (y = 0–4; M = Nb, Mo) were prepared by crystallizing the as-quenched amorphous alloys. The effects of Nb and Mo additions on structures and properties of the Fe40Co40Zr9B10Ge1 alloy are investigated systemically and compared. With increasing Nb or Mo content, the primary crystallization temperature, grain size of α-Fe(Co) phase and coercivity H c all decrease. Moreover, the effect of Mo addition on thermal behavior, microstructure and magnetic properties of the FeCoZrBGe alloy is greater compared to Nb addition. The gap between primary and secondary crystallization peaks of Mo-containing alloys is wider than that of Nb-containing alloys. Both grain size and H c of Mo-containing alloys are smaller than those of Nb-containing alloys. For Fe40Co40Zr9B10Ge1 alloy, high Mo addition proportion is better compared to high Nb addition proportion.

Effects of Cu and Co additions on the crystallization and magnetic properties of FeNbB alloy

“…The α-Mn-type structure and β -Mn-type structure phases are also designated as χ-phase and π-phase, respectively. [7] The compositions of α-Mn-type [15,[27][28][29] and β -Mn-type [6,30] structure phases do not include Mn and are common metastable phases in the early crystallization stage of Fe-based amorphous alloys. They possess structures relate to tetrahedrally closepacked (TCP) structures, comprising mainly coordination Frank-Kasper polyhedra (= 12, 14, 15, 16).…”

“…Fe-based nanocrystalline soft magnetic alloys have attracted considerable attention, as they exhibit better synthetic soft magnetic properties than that of traditional soft magnetic materials and display excellent energy-saving and environmental protection characteristics. [1][2][3][4][5][6][7] The composition design and microstructure control of Fe-based nanocrystalline soft magnetic alloys are important.…”