Bulk Glassy Fe&amp;ndash;Mo&amp;ndash;Ga&amp;ndash;P&amp;ndash;C&amp;ndash;B&amp;ndash;Si Alloys with High Glass-Forming Ability and Good Soft Magnetic Properties

Akiba, Miki; Shen, Baolong; Inoue, Akihisa

doi:10.2320/matertrans.46.2773

Cited by 6 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The main characteristics temperatures estimated from the shown scans are T g = 754 K, T x = 814 K, and T l = 1330 K, for the 1.5 mm rod and T g = 753 K, T x = 812 K, and T l = 1330 K, for the 1.8 mm rod. The existence of a large supercooled liquid region ∆T x (∆T x = T x -T g = 60 K), as well as high values of the reduced glass transition temperature T rg = T g /T l of about 0.567 are characteristic of an alloy with good GFA and high thermal stability against crystallization [15][16][17][18]. Figure 2 shows images of samples annealed by CA (slides a, b and c -transverse cross section, slides d and e -longitudinal cross section).…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Microhardness in Current Annealed Fe65.5Cr4Mo4Ga4P12C5B5.5 Bulk Metallic Glass

Mitrović

Čukić

Jordović

et al. 2007

MSF

View full text Add to dashboard Cite

The rods of Fe-based bulk metallic glasses with the nominal composition Fe65.5Cr4Mo4Ga4P12C5B5.5 were cast by melt injection into 1.5 and 1.8 mm diameter copper molds. The thermal stability, microstructure and crystallization behavior were investigated by differential scanning calorimetry, optical micrography and X-ray diffraction, respectively. The wide supercooled liquid region between crystallization temperature (Tx) and glass transition temperature (Tg) in the as-cast state Tx=Tx-Tg=60 K, as well as the high value of reduced glass transition temperature Trg=Tg/Tl=0.567 (Tl is liquidus temperature) approves enhanced thermal stability of the alloy against crystallization. In the as-cast “XRD-amorphous” state, microhardness HV1=742 was observed. Multistep current annealing thermal treatments were performed for structural relaxation. After applying high enough heating power per square area (PS ≥ 6 W/cm2), intensive crystallization of the samples characterized by appearance of several iron-metalloid compounds (Fe5C2, Fe3Ga4, Fe63Mo37 and Mo12Fe22C10) was observed. The microstructure changes after crystallization bring about differences in the microhardness values. The areas of still present amorphous matrix are with increased value HV1=876, but a remarkable decrease to HV1=323 was observed in precipitated crystallized zone that propagate along inner part of cylinders.

show abstract

Section: Resultsmentioning

confidence: 99%

Microstructure and Microhardness in Current Annealed Fe65.5Cr4Mo4Ga4P12C5B5.5 Bulk Metallic Glass

Mitrović

Čukić

Jordović

et al. 2007

MSF

View full text Add to dashboard Cite

show abstract

“…In [8], by applying different processing modes, soft magnetic materials with the coercive force value of 𝐻 𝑐 = 10 A/m were obtained in ribbon-shaped specimens containing Fe 56 Co 7 Ni 7 B 20 Nb 10 . In [9], it was sh own that the addition of 2% Mo reduces the coercive force from 100 A/m to 5 A/m in amorphous Fe 75 Mo 2 Ga 3 P 10 C 4 B 4 Si 2 alloy. In [10], it was determined that Ni in the composition has a strong in- fluence on the magnetic properties and is the main factor to get soft magnetic properties, by creating an anisotropy field and reducing the coercive force.…”

Section: Introductionmentioning

confidence: 99%

Prospects to Use Amorphous Fe–Ni–Si–B Ribbons in Contactor Cores

2023

View full text Add to dashboard Cite

We consider the possibility to use an amorphous Fe–Ni–Si–B material in the core of contactors, which are widely used in connecting and disconnecting electric circuits, instead of the crystalline material of 3% electric steel. Alloys containing Fe–Ni–Si–B have been treated with the use of mechanical, thermomechanical, and magnetic fields, and the material for practical applications has been obtained. The processing modes were chosen so that a change in the performance of ferromagnetic (below the Curie temperature) alloys during the annealing could be controlled. The obtained specimens were annealed in oil at 360 ∘C in a magnetic field of 200 A/m for 200 min. The temperature mode was chosen so that the stress relaxation could occur during the annealing, and the structural changes in the material could be observed.

show abstract

“…[1][2][3][4][5][6] In the meantime, Al-based metallic glass has also received particular interest because of its low density and potential aerospace applications. [7] However, an Al-based metallic glassy rod with a diameter of 1 mm has not yet been produced.…”

mentioning

confidence: 99%

Synthesis and Properties of Al‐Ni‐La Bulk Metallic Glass

Zhu

et al. 2009

Adv Eng Mater

View full text Add to dashboard Cite

More attention has been paid to bulk metallic glasses (BMGs) in recent years due to their superior properties, and they have already been developed successfully in many systems such as Zr-, Fe-, Mg-, Cu-, Ti-, Ni-and La-based alloys. [1][2][3][4][5][6] In the meantime, Al-based metallic glass has also received particular interest because of its low density and potential aerospace applications. [7] However, an Al-based metallic glassy rod with a diameter of 1 mm has not yet been produced. Mechanical properties of these materials are usually measured by examining wires and ribbons. [8,9] Therefore, the research and application of Al-based metallic glasses are limited to a large extent due to the sample size. It is important and significant to develop Al-based BMGs. Different methods, such as alloying for example, which are popular and effective in other alloy systems, [10] have been employed to improve the glass-forming ability (GFA) of Al-based metallic glasses. They have little effect on the GFA of Al-based alloy systems. [11,12] The low GFA of Al-based alloys results from the existence of local-ordering clusters and high-melting-temperature phases in the alloy melt, which usually act as nucleation sites. This further promotes crystallization: the precipitation of fcc-Al, and intermetallics, which deteriorate the GFA. In this paper, the successful preparation of an Al-based BMG with a diameter of 1 mm in the Al 85.5 Ni 9.5 La 5 (in atomic percentage) alloy by a melt-treatment technique is described. The treatment is adapted to not only remove the pre-existing nuclei but also to realize a high cooling rate. The thermal and mechanical properties of the Al 85.5 Ni 9.5 La 5 BMG, along with its compressive-fracture behavior are explored for the first time. This work will greatly promote the development and application of Al-based BMGs. Figure 1a shows a photograph of an Al 85.5 Ni 9.5 La 5 BMG cylindrical rod with a diameter of 1 mm. The surface is smooth and lustrous, like other as-cast BMGs. Figure 1b shows X-ray diffraction (XRD) patterns of as-cast ribbons, sheets and rods. It can be seen that only one broad diffraction peak in the 2u range from 358 to 458, characteristic of an amorphous structure, is detected, without any crystalline peaks. Figure 2 shows differential scanning calorimetry (DSC) curves of the as-cast ribbons, sheets and rods. The three traces display similar glass-transition and crystallization behaviors and indicate similar amounts of exothermic heat, which is consistent with the XRD results. In comparison to the GFA of Al 86 Ni 9 La 5 reported in ref.[13], we found that a larger size of amorphous alloy is obtained with our casting strategy than with the ordinary wedge-casting method. Fig. 1. a) A photograph of the 1 mm diameter cylindrical rod. b) XRD patterns of the master alloy and as-cast samples.

show abstract

Bulk Glassy Fe–Mo–Ga–P–C–B–Si Alloys with High Glass-Forming Ability and Good Soft Magnetic Properties

Cited by 6 publications

References 21 publications

Microstructure and Microhardness in Current Annealed Fe<sub>65.5</sub>Cr<sub>4</sub>Mo<sub>4</sub>Ga<sub>4</sub>P<sub>12</sub>C<sub>5</sub>B<sub>5.5</sub> Bulk Metallic Glass

Microstructure and Microhardness in Current Annealed Fe<sub>65.5</sub>Cr<sub>4</sub>Mo<sub>4</sub>Ga<sub>4</sub>P<sub>12</sub>C<sub>5</sub>B<sub>5.5</sub> Bulk Metallic Glass

Prospects to Use Amorphous Fe–Ni–Si–B Ribbons in Contactor Cores

Synthesis and Properties of Al‐Ni‐La Bulk Metallic Glass

Contact Info

Product

Resources

About