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

Yodoshi, Noriharu; Yamada, R.; Kawasaki, Akira; Makino, Akihiro

doi:10.1016/j.jallcom.2015.04.088

Cited by 22 publications

(9 citation statements)

References 19 publications

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“…It seems to be applicable to analyze their solidification process and formation characteristics by means of theoretical calculation methods. In fact, some calculation methods have been used for many BMG-forming systems successfully, such as the critical cooling rate evaluation based on the thermodynamics [20][21][22], the cooling rate estimation according to the Fourier's law [23][24][25], and the mixing enthalpy and mismatch entropy calculation for evaluating GFA [26].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of glass formation and critical casting diameter in Al-based metallic glasses

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Evaluation of glass formation and critical casting diameter in Al-based metallic glasses

et al. 2015

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“…Fe 76 Si 9 B 10 P 5 was selected in this study as a representative soft-magnetic amorphous material as it has a high amorphous-forming ability and excellent soft-magnetic properties. 23,24) A detailed analysis of the effect of the atomization conditions on the morphology, microstructure, and internal pore volume of the powder particles was performed. We experimentally verified the hypothesis that the presence of a reducing gas during atomization can suppress the oxidation of the droplet surface and enhance gas removal from the particles.…”

Section: A D V a N C E V I E Wmentioning

confidence: 99%

Evaluation of Porosity in Gas-Atomized Powder by Synchrotron X-ray CT and Investigation of the Effect of Gas Species

2021

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The presence of pores in gas-atomized alloy powders induces a significant deterioration in the properties of the final product. However, there is no established technique to quantitatively analyze the porosity of gas-atomized powders. In this study, the pores in gas-atomized amorphous Fe 76 Si 9 B 10 P 5 powder particles prepared under different atomization conditions were analyzed in detail using synchrotron radiation X-ray computed tomography. This technique allowed the detection of small pores with diameters below 10 µm. It also enabled the quantification of the porosity; thus, the pore diameter and volume ratio under different atomization conditions were determined. The volume ratio of the pores with the use of low-pressure Ar as the atomization gas was lower than that with the use of high-pressure Ar. The use of a low-pressure gas during spraying induced an increase in the diameter of the powder particles, thereby resulting in the presence of numerous irregular-shaped particles. The results of X-ray diffraction confirmed the partial precipitation of a crystalline phase with a decrease in the cooling rate. The use of 3 or 7% ArH 2 mixtures as the atomization gas induced a decrease in the number and volume of pores, without affecting the particle size and cooling rate. The presence of H 2 as a reducing gas suppressed the surface oxidation of the droplet during the atomization of the molten-metal stream, which allowed trapped gas bubbles to be efficiently removed before solidification. This study demonstrated that the total pore volume in a powder can be decreased using a H 2 -containing gas. The low cost and abundance of H 2 could facilitate the use of this technique in various industrial applications.

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“…So the final properties can be modified through microstructure morphology change, nonequilibrium phase formation or structure refinement. Therefore, simulation and characterizing the solidified microstructure of mono-sized spherical copper particles with different diameter at various cooling rates is important for revealing their inherent phase-forming ability [23]. During the solidification of copper droplet, these particles have different microstructures, and this difference would be due to the difference cooling rate in the solidification.…”

Section: Introductionmentioning

confidence: 99%

Cooling Rate and Microstructural Investigation of Rapidly Solidified Spherical Mono-Sized Copper Particles

Wang

Can

et al. 2020

MSF

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Spherical copper particles with diameter ranging from 120.6 to 437.0 μm were prepared by the pulsated orifice ejection method (termed “POEM”). These spherical copper particles exhibit a good spherical shape and a narrow size distribution, suggesting that the liquid copper can completely break the balance between the surface tension and the liquid static pressure in the crucible micropores and accurately control the volume of the droplets. Furthermore, the relationship between cooling rate and microstructures of spherical copper particles was carried out with a specific focus on different cooling atmosphere and particle diameter during the rapid solidification. The cooling rate of spherical copper particles is evaluated by a Newton’s cooling model. It is revealed that the cooling rate was depended on cooling medium and particle diameter. The cooling rate decreases and the grain size increases with the increase of particle diameter during the rapid solidification, while the grain boundary of same particle diameter with larger cooling rate in argon gas is smaller, while the grain boundary of particles with smaller cooling rate in helium gas is larger. When the particle diameter is larger than 100 μm, the cooling rate of the cooper droplet in argon gas achieves 1.0×104 K/s. Meanwhile, the cooling rate decreases rapidly when the particle diameter increased between 70.6 and 149.6 μm. It is an effective route for fabrication of high-quality spherical copper particles.

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

Cited by 22 publications

References 19 publications

Evaluation of glass formation and critical casting diameter in Al-based metallic glasses

Evaluation of glass formation and critical casting diameter in Al-based metallic glasses

Evaluation of Porosity in Gas-Atomized Powder by Synchrotron X-ray CT and Investigation of the Effect of Gas Species

Cooling Rate and Microstructural Investigation of Rapidly Solidified Spherical Mono-Sized Copper Particles

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