Effect of Ni addition on the glass-forming ability and soft-magnetic properties of FeNiBPNb metallic glasses

Abstract

The effect of Ni addition on the glass-forming ability (GFA) and soft-magnetic properties of an (Fe 1x Ni x ) 75.5 B 14.5 P 7 Nb 3 (x=0-0.6) alloy system were investigated. We found that the addition of Ni was effective in allowing the alloy to approach a eutectic point as well as increasing the thermal stability of the supercooled liquid. By increasing the amount of Ni, the supercooled liquid region (∆T x ), the reduced glass transition temperature T rg (T g /T l ) and the  parameter [T x /(T g +T l )] increased from 49 to 75 K, 0.540 to 0.594 and 0.373 to 0.405, respectively. As a result, novel (Fe 1-x Ni x ) 75.5 B 14.5 P 7 Nb 3 bulk metallic glass (BMG) rods with a maximum diameter of 1 mm were synthesized with a composition of x=0.5 and x=0.6 by copper mold casting. These metallic glasses have a moderate saturation magnetization of 0.37-1.20 T with good soft-magnetic properties, i.e. a low coercivity of 1.4-3.3 A/m and a high effective permeability of 13100-20900 at 1 kHz. The simultaneous achievement of a high GFA and good soft-magnetic properties for the FeNi-based alloy system is promising for the future development of BMGs. Fe-based bulk metallic glasses (BMGs) have attracted an increasing amount of attention because of their excellent soft-magnetic properties, high fracture strength, high hardness and good corrosion resistance. Since the first synthesis of an Fe-based ferromagnetic BMG with a wide supercooled liquid region in a Fe-(Al, Ga)-metalloid system in 1995 [1,2], much effort has been devoted to the search for BMG systems with high glass-forming ability (GFA) and good soft-magnetic properties. A variety of Fe-based BMGs have been developed for potential application as functional and structural materials such as FePC-based BMGs, FeBSi-based BMGs and their extensive derivatives [3][4][5][6]. Consequently, a breakthrough in the development of novel Fe-based BMG is of primary importance and the search for new systems with good soft-magnetic properties has always been a hot issue. Recently, a new Fe 77 B 13 P 7 Nb 3 metallic glass system with a wide ∆T x and low core loss has been developed at the NEC Tokin Corporation, Japan [7]. However, because of its low glassy-forming ability, only ribbons with thicknesses of 100-120 µm were prepared. In addition, it has disadvantages of a relatively high coercivity (H c ) of more than 2 A/m, low effective permeability (µ e ) and poor µ e stability upon an increase in frequency. Nevertheless, this system is promising for the development of a novel BMG because of the significant difference in atomic size and the large negative heats of mixing between the elements. In this study, we aimed to develop an FePBNb metallic glass system with a much higher GFA and good soft-magnetic properties by examining the effect of Ni addition on the GFA and the soft-magnetic properties based on two factors: (1) As a ferromagnetic element, Ni has been shown to be effective in improving the soft-magnetic properties in

Interatomic Potential to Predict the Favored Glass-Formation Compositions and Local Atomic Arrangements of Ternary Al-Ni-Ti Metallic Glasses

“…It is worth noting that the region with a large driving force (>0. 15 Just as Ni is a well-known alloying element with a significant effect on the enhancement of the GFA of metallic glasses [55][56][57], the addition of Ni into Al-Ti solid solutions results in a greater ADF for crystalline-to-amorphous transition until Ni becomes the main element of the solid solutions.…”

Amorphous alloys — A kind of promising high-performance materials

“…The result is a delightful one. We have 17 papers collected in this special issue, which cover broad areas of amorphous alloys, including atomic packing and clusters formation in amorphous alloys [1-3], fragility in glass-forming liquid [4], effects of alloying elements on the glass forming ability of different alloys [5][6][7], deformation behavior and improved mechanical property of amorphous alloys [8][9][10][11], glass-based composites [12,13], high strength metallic glass [14] and functional properties of metallic glasses [15][16][17].…”

Machine learning prediction of magnetic properties of Fe-based metallic glasses considering glass forming ability

“…These theories or models that consider insufficient factors usually have many exceptions, and their estimation accuracy is limited. Therefore, it is still a challenge to reveal an accurate variation pattern of the soft magnetic properties of FeMGs based on physiochemical theories, so a large number of experiments consider a trial-and-error strategy to develop high-performance metallic glasses 4 [17][18][19][20][21][22][23][24][25][26].…”