Preparation of Fe-based monodisperse spherical particles with fully glassy phase

Miura, Ayako; Dong, Wei; Fukue, Masahiro; Yodoshi, Noriharu; Takagi, Kenta; Kawasaki, Akira

doi:10.1016/j.jallcom.2011.02.044

Cited by 37 publications

(15 citation statements)

References 25 publications

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“…Droplet generators can generate single droplets of a defined size [1][2][3] and are common tools to study phenomena such as droplet impact [4,5] or droplet collisions [6,7] under defined conditions. While droplet generation is simple to achieve with cold fluids, specific requirements for the droplet generators provide more challenges for the droplet generation of liquid metals with increasing melt temperature.…”

Section: Introductionmentioning

confidence: 99%

Solidification of single droplets under combined cooling conditions

Ellendt

Ciftci

Goodreau

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this study, a pneumatic high-temperature droplet generator was used to generate individual droplets (diameter range: 350 -1200 µm) which were cooled under combined cooling conditions. The individual droplets were cooled in a nitrogen atmosphere after ejection and during subsequent free fall. After a defined falling distance, the particles were quenched in either oil or water to further increase their cooling rate. Two alloys in different temperature ranges were used to study the effect of different cooling conditions quantitatively by the analysis of different microstructural features. To show the working range of the droplet generator, a metallic glass FeCo35.1Nb7.7B4.3Si2.8 (liquidus: 1210 °C) was used as a high-temperature alloy, and its resulting amorphous fraction was quantified as an indicator for different cooling conditions. Furthermore, the aluminium alloy AlCu4.5 (liquidus: 650 °C) was solidified under different conditions and the subsequent secondary dendrite arm spacing (SDAS) measurements were analyzed.

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Section: Introductionmentioning

confidence: 99%

Solidification of single droplets under combined cooling conditions

Ellendt

Ciftci

Goodreau

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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“…In our method, monodispersed particles are formed according to the following mechanism: after melting the mother alloys in a crucible with a small orifice at the bottom, small droplets are ejected through the orifice by precisely controlled mechanical knocking with a vibrating rod, and then solidify during free falling in a cooling tube without containers [14,15]. This method enables the accurate determination of the critical cooling rate needed for maintaining a metallic glassy or amorphous phase in Fe-based alloys, which is difficult to determine by conventional methods [16]. This allows us to discuss quantitatively the nucleation phenomena in Fe-based alloys and their dependence on the composition.…”

Section: Introductionmentioning

confidence: 99%

“…In a previous study, we successfully prepared monodispersed particles of [(Fe 0.5 Co 0.5 ) 0.75 Si 0.05 B 0.2 ] 96 Nb 4 metallic glass with a maximum diameter of 650 lm by POEM, and revealed that the critical cooling rate for maintaining the glassy phase is about 1000 K/s [16]. We also tried to obtain monodispersed particles of [(Fe 0.8 Co 0.2 ) 0.75 Si 0.05 B 0.2 ] 96 Nb 4 metallic glass with higher Fe content, identifying in 300 lm the maximum diameter of a single-glassy phase particle, with a corresponding critical cooling rate of about 4000 K/s [19].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of critical cooling rate of Fe76Si9B10P5 metallic glass by containerless solidification process

Yodoshi

Yamada

Kawasaki

et al. 2015

Journal of Alloys and Compounds

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“…Among the BMG-forming alloy systems Fe-based BMGs attract considerable attention due to their high strength, high hardness and corrosion properties [6][7][8][9]. However, it is well known that the low glass forming ability (GFA) of some Fe-based alloys is a major obstacle for engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Role of Nb in glass formation of Fe–Cr–Mo–C–B–Nb BMGs

Zhai

Pineda

Duarte

et al. 2014

Journal of Alloys and Compounds

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Abstract:A new Fe-based bulk metallic glass with superior glass forming ability, Fe 46 Cr 15 Mo 14 C 15 B 6 Nb 4 , was developed based on the Fe-Cr-Mo-C-B alloy system by minor addition of niobium. The effects of niobium addition on glass formation of the Fe 50-x Cr 15 Mo 14 C 15 B 6 Nb x (x=0, 2, 4 and 6 at.%) alloys were investigated. The optimum addition content of niobium was determined as 4 at.% by X-ray diffraction and differential scanning calorimeter analysis. A fully amorphous rod sample with 3 mm in diameter was produced by using commercial-grade raw materials and a copper mold casting technique. This alloy shows an ultimate compressive strength of 1920 MPa and Vickers hardness 1360 HV, which is two to three times that of conventional high strength steel and suggests a promising potential for applications combining outstanding corrosion and wear resistance properties. The crystallization kinetics studies found that the activation energies for glass transition, onset of crystallization and crystallization peak were higher than those of other reported Fe-based bulk metallic glasses. The value of the fragility parameter m for the Fe 46 Cr 15 Mo 14 C 15 B 6 Nb 4 alloy was calculated to be 34, indicating that the Fe-Cr-Mo-C-B-Nb alloy system is a strong glass former according to the Angell's classification scheme. It is inferred that 2 the more sequential change in the atomic size, the generation of new atomic pairs with large negative heats of mixing and the amount of oxygen in the molten liquid neutralized into niobium oxides provide a synergetic effect for the remarkably improved glass-forming ability and thermal stability.

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Preparation of Fe-based monodisperse spherical particles with fully glassy phase

Cited by 37 publications

References 25 publications

Solidification of single droplets under combined cooling conditions

Solidification of single droplets under combined cooling conditions

Evaluation of critical cooling rate of Fe76Si9B10P5 metallic glass by containerless solidification process

Role of Nb in glass formation of Fe–Cr–Mo–C–B–Nb BMGs

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