Enhancement of glass-forming ability of Fe-based bulk metallic glasses with high saturation magnetic flux density

Abstract

The effects of substituting Fe with Ni on thermal properties, glass-forming ability (GFA) and magnetic properties of Fe76-xNixMo3.5P10C4B4Si2.5 (x = 0−30 at.%) alloys were investigated in detail. The breadth of the supercooled liquid region was found to gradually increase from 42 to 55 K with increasing Ni content to 30 at.%. When x = 5 at.%, the alloy composition approached a eutectic point, resulting in an increase in GFA. As a result, FeNiMoPCBSi bulk metallic glasses with critical diameters up to 5.5 mm were successfully synthesized by copper mold casting. These glassy alloys exhibit a high saturation magnetic flux density of 0.75−1.21 T and excellent soft magnetic properties, i.e., low coercive force of 1.1−2.0 A/m, and high effective permeability of 14400−19700 at 1 kHz under a field of 1 A/m. The reasons for the high stability of the supercooled liquid, and the high GFA as well as excellent soft magnetic properties are discussed in this article

Local structural evolution of Fe54C18Cr16Mo12 bulk metallic glass during tensile deformation and a temperature elevation process: a molecular dynamics study

“…[9][10][11] Fe-based BMGs display a unique magnetic property, so it is oen used in coil production. [12][13][14] In addition, Fe-based BMGs also have excellent corrosion resistance, allowing for their placement in the body as a biomedical implant material, of which 316L stainless steel, Ti-based BMG, and Co-Cr alloys are commonly used. Although those medical alloys are similar, studies have shown that 316L stainless steel is potentially harmful to the human body because its components contain nickel (Ni), which easily reacts to produce nickel ions aer corroding.…”

Effect of copper addition on the glass forming ability in Pd-Si binary amorphous alloying system

“…[1][2][3] Pd-Si alloys, typical ideal systems for studying amorphous structures and properties, were always attracted for theoretical research and simulations. As a binary alloy system, the maximum casting thickness is 8mm, which is even bigger than some ternary alloys.…”

“…9 Pd-Cu-Si, one of the first bulk metallic glasses developed in 1974 by Chen et al, was often selected for scientific investigation in the common composition Pd 77.5 Cu 6 Si 16.5 , 10-13 but systematic study on the effect of different Cu addition on the glass formation is still limited. In this case, the binary alloy series Pd 81+x Si 19-x (x=0, 1, 1.5, 2, 2.5, 3, 4) and the ternary alloy series Pd 83.5-x Cu x Si 16.5 (x=0, 2,4,6,8,10,12) were selected to investigate the effect of Cu additions on the glass forming ability (GFA) and thermal stability in the binary Pd-Si system. First, a combination of X-ray diffraction (XRD), transmission electronic microscopy (TEM) and differential scanning calorimetry (DSC) was used to investigate the amorphous state of the produced samples.…”

Study of relaxation phenomena and local structure evolution in metallic glasses by means of Mössbauer and mechanical spectroscopy

“…However, these Fe-based metallic glasses have the limitation of a reduced critical diameter, few millimeters when produced as bulk amorphous alloys, because of their low GFA. Therefore, there is a limitation for the potential use of Fe-based metallic glasses in engineering applications and, nowadays their production is mostly in form of thin ribbons, wires and films [6]. The first Fe-based bulk metallic glass, Fe-(Al,Ga)-(P,C,B,Ge,Si), was produced in a shape of a rod with 1-2 mm diameter in 1995 [7].…”