Ni-based Ni-Fe-B-Si-Ta bulk metallic glasses

et al. 2022

Mater. Res. Express

Glass forming ability (GFA) is one of the key factors hindering the application of bulk metallic glasses (BMGs). In this paper, a cluster-related method was used to design good glass-formers in the complex Co-Fe-based system. A novel Co-centered Co-Mo binary topologically packed cluster Co-Co8Mo4 with 12-coordination number was found and used. The basic ternary composition in Co-Mo-B system is calculated based on an intersection of cluster lines B-B2Co8 and Co-Co8Mo4. Based on this, a series of novel Co-Fe-based glass-formers with high GFA, were quickly designed using the method of similar element replacement and microalloying. The best glass-former is (Co27.5Fe27.5Mo12.2Cr12.2B16P4.6)98Y2. The source of high GFA of designed glass-formers was also discussed. The results of this paper would offer researchers a novel insight in understanding the source of high GFA of Co/Fe-based system, and lay a solid foundation for exploring Co/Fe-Mo-based glass-formers via newly found Co-Mo binary cluster.

Section: Introductionmentioning

confidence: 99%

Compositions design of Co-Fe-based bulk metallic alloys

et al. 2022

Mater. Res. Express

“…bulk metallic glasses, glass forming ability, thermal stability, elastic properties Citation: Minor alloying addition or microalloying technology has proven to be an effective approach in promoting glass formation, enhancing thermal stability and improving the plasticity of BMGs [20][21][22]. It has been found that microalloying with proper alloying elements can dramatically improve the GFA of various BMGs [23][24][25]. Previous studies showed that the GFA of Cu-, Mg-and ZrCu-based bulk metallic glasses were significantly enhanced by adding Ag [26][27][28][29].…”

mentioning

confidence: 99%

“…It has been found that microalloying with proper alloying elements can dramatically improve the GFA of various BMGs [23][24][25]. Previous studies showed that the GFA of Cu-, Mg-and ZrCu-based bulk metallic glasses were significantly enhanced by adding Ag [26][27][28][29].…”

mentioning

confidence: 99%

Effect of Ag addition on the thermal stability and glass-forming ability of Zr35Ti30Cu7.5Be27.5 bulk metallic glass

Zong

et al. 2012

Chin. Sci. Bull.

The thermal stability and glass forming ability (GFA) of Zr 35−x Ti 30 Cu 7.5 Be 27.5 Ag x (x = 0-10) alloys were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and ultrasonic techniques. We found that the addition of 1 at.% Ag can considerably enhance the GFA as indicated by an increase in the critical glass dimension from 15 mm in the Zr 35 Ti 30 Cu 7.5 Be 27.5 alloy to 20 mm in the Zr 34 Ti 30 Cu 7.5 Be 27.5 Ag 1 alloy. However, with the addition of more Ag the supercooled liquid region (T x ) and  parameter (defined as T x /(T g +T l )) drastically decreased from 155 K and 0.436 to 76 K and 0.363, respectively, resulting in a decrease in the GFA. Additionally, the elastic constant (the ratio of shear modulus to bulk modulus or Poisson's ratio) was also used as a gauge to evaluate the GFA in Zr 35−x Ti 30 Cu 7.5 Be 27.5 Ag x alloys. bulk metallic glasses, glass forming ability, thermal stability, elastic properties Citation: Minor alloying addition or microalloying technology has proven to be an effective approach in promoting glass formation, enhancing thermal stability and improving the plasticity of BMGs [20][21][22]. It has been found that microalloying with proper alloying elements can dramatically improve the GFA of various BMGs [23][24][25]. Previous studies showed that the GFA of Cu-, Mg-and ZrCu-based bulk metallic glasses were significantly enhanced by adding Ag [26][27][28][29]. In this work, Ag was also chosen as the doping element in the Zr 35 Ti 30 Cu 7.5 Be 27.5 system, which had a critical diameter of about 15 mm and a wide supercooled liquid region of 165.1 K [30]. To investigate the elastic properties of the resultant ZrTi-based BMGs their acoustic velocities were measured at room temperature by a pulse echo overlap method.Zr 35-x Ti 30 Cu 7.5 Be 27.5 Ag x (x = 0, 1 at.%, 2 at.%, 3 at.%, 5 at.%, 7 at.%, 10 at.%) ingots were prepared by arc melting high purity ( 99.9 wt.%) constituents under a titanium gettered argon atmosphere. Each ingot was remelted at least four times to ensure chemical homogeneity. Cylindrical alloy rods with diameters of 3, 4, 15 and 20 mm were prepared by injection casting the remelted ingots into a copper mould under an argon atmosphere. The samples were then

“…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 permalloys and FeNi-base metallic glasses [5,8,9]. (2) Ni shows mutual solubility with Fe and has been shown to be effective in improving the thermal stability of the supercooled liquid as well as allowing the alloy to approach a eutectic point composition leading to a high GFA [10][11][12].…”

mentioning

confidence: 99%

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

Wang

et al. 2011

Chin. Sci. Bull.

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