Thermal and Magnetic Properties of Bulk Fe-Based Glassy Alloys Prepared by Copper Mold Casting

Inoue, Akihisa; Shinohara, Yoshiyuki; Gook, Jin Seon

doi:10.2320/matertrans1989.36.1427

Cited by 451 publications

(217 citation statements)

References 17 publications

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“…However, during the last decade, some exceptions have been reported because of the discoveries of stabilized supercooled liquid alloys without crystallization even during cooling at slow rates below 100 K/s [1,2]. As a result, bulk amorphous alloys have been prepared in a number of alloy systems such as Mg- [3], Ln(lanthanide)- [4], Zr- [5,6], Fe- [7], Pd-Cu- [8], Ti- [9], Ni- [10] and Co- [11] bases and have gained some applications due to their unique mechanical properties, chemical properties and good workability resulting from the amorphous structure. It has subsequently been found that the use of the stabilized liquid also gives rise to bulk amorphous alloys containing nanocrystalline [12] and nanoquasicrystalline [13] particles with good mechanical properties in the Zr-based alloy systems.…”

Section: Introductionmentioning

confidence: 99%

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

Inoue

Fan

Saida

et al. 2000

Science and Technology of Advanced Materials

110

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It was recently found that the addition of special elements leading to the deviation from the three empirical rules for the achievement of high glass-forming ability causes new mixed structures consisting of the amorphous phase containing nanoscale compound or quasicrystal particles in Zr-Al-Ni-Cu-M (M Ag, Pd, Au, Pt or Nb) bulk alloys prepared by the copper mold casting and squeeze casting methods. In addition, the mechanical strength and ductility of the nonequilibrium phase bulk alloys are significantly improved by the formation of the nanostructures as compared with the corresponding amorphous single phase alloys. The composition ranges, formation factors, preparation processes, unique microstructures and improved mechanical properties of the nanocrystalline and nanoquasicrystalline Zr-based bulk alloys are reviewed on the basis of our recent results reported over the last two years. The success of synthesizing the novel nonequilibrium, highstrength bulk alloys with good mechanical properties is significant for the future progress of basic science and engineering. ᭧

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Section: Introductionmentioning

confidence: 99%

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

Inoue

Fan

Saida

et al. 2000

Science and Technology of Advanced Materials

110

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“…Fe-based bulk metallic glasses (BMG), developed since 1995, show an interesting combination of physical and mechanical properties [1]. While conventional metallic glasses require rapid solidification with a cooling rate of about 10 6 K/s [2,3], BMGs can be formed at cooling rates between 1 and 100 K/s, leading to the possibility of casting much thicker objects [4].…”

Section: Introductionmentioning

confidence: 99%

“…While conventional metallic glasses require rapid solidification with a cooling rate of about 10 6 K/s [2,3], BMGs can be formed at cooling rates between 1 and 100 K/s, leading to the possibility of casting much thicker objects [4]. At first, Fe-based BMGs were developed with the purpose of obtaining very good soft ferromagnetic properties due to the structural isotropy of the material (high Fe content alloys in Fe-B-Si system) [1,5]. How-ever, during the last decade, these materials could be prepared with lower Fe content showing a paramagnetic behavior at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Fe-based bulk metallic glasses in plate form

Lavorato

Fiore

Castellero

et al. 2012

Physica B: Condensed Matter

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Amorphous alloys with composition (at%) Fe 48 Cr 15 Mo 14 C 15 B 6 Gd 2 (alloy A) and Fe 48 Cr 15 Mo 14 C 15 B 6 Y 2 (alloy B) were prepared either using pure elements (A and B1) and a commercial AISI430 steel as a base material (B2). When prepared from pure elements both alloys (A and B1) could be cast in plate form with a fixed thickness of 2 mm and variable lengths between 10 and 20 mm by means of copper-mold injection in air atmosphere. In the case of alloy B2, prepared using commercial grade raw materials, rods of 2 mm diameter were obtained.X-ray diffraction and scanning electron microscopy observations confirmed that an amorphous structure was obtained in all the as-cast samples. A minor fraction of crystalline phases (oxides and carbides) was detected on the as-cast surface. Differential scanning calorimetry measurements showed a glass transition temperature at 856 K for alloy A and 841 K for alloy B1, and an onset crystallization temperature of 887 K for alloy A and 885 K for alloy B1. In the case of alloy B2 a slightly different crystallization sequence was observed.Values of hardness ( 13 GPa) and the Young modulus ( 180 GPa) were measured by nanoinden-tation for both the alloys. The effects of adverse casting conditions (such as air atmosphere, non-conventional injection copper mold casting and partial replacement of pure elements with commercial grade raw materials) on the glass formation and properties of the alloy are discussed.

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“…Until 1995, a number of new Fe-based bulk amorphous alloys with wide super-cooled liquid region (ÁT x ) above 50 K were developed according to these three empirical rules for achieving high glass forming ability (GFA). The Fe-based bulk amorphous alloys mainly consist of the following groups of elements Fe-(Al,Ga)-(P,C,B,Si), [16][17][18][19] Fe-(Co,Ni)-(Zr,Hf,Nb)-B, [20][21][22] (Fe,Co)-(Zr,Hf)-(Nb,Ta)-(Mo,W)-B, 23) (Fe,Co)-Ln-B 24) (Ln = lanthanide metals) and (Nd,Pr)-FeAl [25][26][27] systems. The possibility to cast bulk Fe-based amorphous magnetic alloys widely extends their potential in industrial applicability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Al on Bulk Amorphization and Magnetic Properties of FeSnPSiB Alloys

et al. 2004

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Structure and magnetic properties of melt-spun multi-component Fe 78Àx Al x Sn 2 P 12 Si 4 B 4 (x ¼ 0, 3, 4, 5 at%) amorphous ribbons and copper-mold-cast rods were investigated. The improvement of thermal stability was recognized with the replacement of Fe by 3$5 at% Al in these Sn-containing alloys. The super-cooled liquid region (ÁT x ), defined by (T x À T g ) where T x is the crystallization temperature and T g the glass transition temperature, increases from 46.5 K as x ¼ 3 to the maximum value 50.2 K as x ¼ 4. With increasing Al content, magnetic properties of annealed Fe 78Àx Al x Sn 2 P 12 Si 4 B 4 (x ¼ 3$5 at%) amorphous ribbons are: saturation magnetization decreases from 1.22 to 1.18 T; coercive force decreases from 3.3 to 2.2 A/m, maximum permeability increases from 137000 to 208000, Curie temperature lowers from 591.1 K to 578.3 K; the electrical resistivity increases from 175 to 188 m-cm; and core loss is about 0.14 W/kg (50 Hz, 1.1 T external magnetic field). Bulk amorphous rods with 1 mm diameter were successfully demonstrated for the composition Fe 74 Al 4 Sn 2 P 12 Si 4 B 4 by a copper mold casting method. Due to the combination of good glass forming ability and superior soft magnetic properties, these alloys will find potential applications in industries.

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Thermal and Magnetic Properties of Bulk Fe-Based Glassy Alloys Prepared by Copper Mold Casting

Cited by 451 publications

References 17 publications

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

High-strength Zr-based bulk amorphous alloys containing nanocrystalline and nanoquasicrystalline particles

Preparation and characterization of Fe-based bulk metallic glasses in plate form

Effect of Al on Bulk Amorphization and Magnetic Properties of FeSnPSiB Alloys

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