Pressure controlled micro-viscous deformation assisted spark plasma sintering of Fe-based bulk amorphous alloy

Paul, Tanaji; Chawake, Niraj; Kottada, Ravi Sankar; Harimkar, Sandip P.

doi:10.1016/j.jallcom.2017.12.147

Cited by 21 publications

(12 citation statements)

References 28 publications

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“…It enhances the sintering kinetics, while the temperature enhances the atomic motion, and with it, the diffusion process, but in metallic glasses, also promotes crystallization. Note that the temperature should be above 535 °C of a Fe-alloy to activate particle deformation playing a role in the material densification [34]. Therefore, the final temperature was decreased at 560 ℃ to avoid crystallization, but the axial pressure of samples S4 was increased from 50 MPa to 100, 200, 300, and 400 MPa.…”

Section: Optimization Of Bmg Materialsmentioning

confidence: 99%

Microstructure and corrosion study of Fe-based bulk metallic glass obtained by spark plasma sintering

Zarazúa-Villalobos

Mary

Soo-Hyun

et al. 2021

Journal of Alloys and Compounds

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Section: Optimization Of Bmg Materialsmentioning

confidence: 99%

Microstructure and corrosion study of Fe-based bulk metallic glass obtained by spark plasma sintering

Zarazúa-Villalobos

Mary

Soo-Hyun

et al. 2021

Journal of Alloys and Compounds

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“…Insufficient amorphous forming abilities of the Febased ribbons, usually less than 30 μm, limit their extensive applications [1,5,8]. Electric spark sintering (SPS) method [11] or additive manufacturing (3D printing, selective laser remelting, hot isostatic pressing, etc.) [12 -14] can effectively improve the final geometrical sizes, mechanical and magnetic properties of Fe-based amorphous soft magnets.…”

Section: Introduction *mentioning

confidence: 99%

Fabrication and Soft Magnetic Properties of Fe81.3Si4B10P4Cu0.7 Amorphous Powders by Using the Spinning-water Atomization Process

Dan

et al. 2022

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Soft magnetic Fe81.3Si4B10P4Cu0.7 powders have been fabricated by using spinning-water atomization process (SWAP) under the water pressure of 17.5 MPa and gas pressure of 2 MPa. To clarify the amorphous forming ability, thermal stability, and the corresponding soft magnetism, the as-SWAPed powders have been sieved into 6 groups with different powder sizes from 0 – 150 μm. After the analysis of the amorphous and crystalline characteristics, the morphology, and soft magnetic properties of these 6 groups of as-SWAPed powders, it is concluded that the SWAPs with a high cooling rate of 105 K/s can improve the amorphous forming abilities of Fe81.3Si4B10P4Cu0.7 powders up to 53 μm, the saturated magnetic flux density as high as 170 – 173 emu/g and the thermal stabilities higher than 112.8 K. The characteristic parameters of as-SWAPed powders above mentioned are close to those of the counterpart rapid solidified ribbons. The surface oxide layers on as-SWAPed powders mainly consist of Fe2O3, and are 10 nm thick, much thicker than these counterpart ribbons, which might help to weaken the eddy effects accompanying with the slight decrease of the saturated magnetic flux density. Due to the higher cooling rates of SWAPs than gas atomization processes and the better spheroidization of powders for SWAPs than water atomization processes, it is key for NANOMET® family alloys to increase their amorphous forming abilities and better the soft magnetic performances.

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“…The utilization of metallic glass alloy systems during manufacturing as well as applications is most extensive in the temperature regime of the supercooled liquid region (SLR) or, in other words, between the glass transition temperature T g and the onset crystallization temperature T x 36 . This temperature regime enables harnessing the drastic decrease in viscosity of metallic glasses 37 .…”

Section: Introductionmentioning

confidence: 99%

Quantification of Thermal Oxidation in Metallic Glass Powder using Ultra-small Angle X-ray Scattering

Paul

Zhang

Biswas

et al. 2019

Sci Rep

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In this paper, the composition, structure, morphology and kinetics of evolution during isothermal oxidation of Fe 48 Cr 15 Mo 14 Y 2 C 15 B 6 metallic glass powder in the supercooled region are investigated by an integrated ex - situ and in - situ characterization and modelling approach. Raman and X-ray diffraction spectra established that oxidation yielded a hierarchical structure across decreasing length scales. At larger scale, Fe 2 O 3 grows as a uniform shell over the powder core. This shell, at smaller scale, consists of multiple grains. Ultra-small angle X-ray scattering intensity acquired during isothermal oxidation of the powder over a wide Q-range delineated direct quantification of oxidation behavior. The hierarchical structure was employed to construct a scattering model that was fitted to the measured intensity distributions to estimate the thickness of the oxide shell. The relative gain in mass during oxidation, computed theoretically from this model, relatively underestimated that measured in practice by a thermogravimetric analyzer due to the distribution in sizes of the particles. Overall, this paper presents the first direct quantification of oxidation in metallic glass powder by ultra-small angle X-ray scattering. It establishes novel experimental environments that can potentially unfold new paradigms of research into a wide spectrum of interfacial reactions in powder materials at elevated temperatures.

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Pressure controlled micro-viscous deformation assisted spark plasma sintering of Fe-based bulk amorphous alloy

Cited by 21 publications

References 28 publications

Microstructure and corrosion study of Fe-based bulk metallic glass obtained by spark plasma sintering

Microstructure and corrosion study of Fe-based bulk metallic glass obtained by spark plasma sintering

Fabrication and Soft Magnetic Properties of Fe81.3Si4B10P4Cu0.7 Amorphous Powders by Using the Spinning-water Atomization Process

Quantification of Thermal Oxidation in Metallic Glass Powder using Ultra-small Angle X-ray Scattering

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