Abstract
The glass-forming ability (GFA) of Fe-Ni-TM alloys, where TM = V, Nb, Cr, Mo, was determined utilizing thermodynamic modeling. Enthalpies of formation of amorphous state were calculated and analyzed along with normalized mismatch entropy and glass-forming ability parameter. All thermodynamic quantities were qualitatively compared with enthalpies of formation of solid solution and experimental results. Due to the fact that FeNi-based amorphous ribbons are used nowadays in magnetoelastic sensors (MES), which can be used in biomedical or chemical applications, discussion is concentrated mainly on the substitution effect of group V and VI transition metals on the improvement of GFA. In this sense, group V elements are preferred, with Nb as the most promising candidate among all analyzed TM elements. This is a consequence of significant differences of potential and density of electrons at the boundary of Wigner–Seitz cell comparing to Fe and Ni, which in turn leads to more negative values of interfacial enthalpy and higher driving force for vitrification.
Highlights
FENI-BASED amorphous ribbons are widely used as magnetoelastic sensors (MES) nowadays, and due to their outstanding properties can be utilized in biomedical or chemical applications.[1,2] Such sensors in a form of freestanding objects/particles or cantilevers are usually built of magnetostrictive Fe40Ni38Mo4B18 (Metglas 2826 MB).[3]
Various quantities are used throughout the paper as glass-forming ability (GFA) indicators, namely: enthalpy of formation of amorphous phase DHam, normalized mismatch entropy Sr/kB,[18] which reflects the effect of atomic radius mismatch and glass forming ability parameter DPHS, which is the product of chemical enthalpy DHchem and mismatch entropy.[13]
Looking across the phase diagram, more negative values of enthalpy of formation, which indicate higher driving force for vitrification, were obtained for V and Nb, which belong to group V in the periodic table
Summary
FENI-BASED amorphous ribbons are widely used as magnetoelastic sensors (MES) nowadays, and due to their outstanding properties can be utilized in biomedical or chemical applications.[1,2] Such sensors in a form of freestanding objects/particles or cantilevers are usually built of magnetostrictive Fe40Ni38Mo4B18 (Metglas 2826 MB).[3]. METALLURGICAL AND MATERIALS TRANSACTIONS A amorphous structure on soft magnetic properties, which will be beneficial in further development of such materials It can be done by variation of conditions of sputtering process, where formation of homogenous (with different packing density) and inhomogenous amorphous films (nanoglasses)[7,8] is expected. The GFA is the feature which matters the most in designing process, as it determines further possibilities of vitrification and reflects the tendency for amorphous state formation It can be determined in many different ways, including experimental and theoretical methods.[10,11,12,13] Thermodynamic approach utilizing semi-empirical Miedema’s model[14,15,16,17] is used in the present paper to determine GFA of ternary Fe-Ni-TM alloys, where TM represent group V and VI transition metals
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