The oxidation behavior of an Fe61B15Zr8Mo7Co5Y2Cr2 bulk metallic glass at 550–700 °C

Kai, Wu; Ren, I.F.; Kao, P.C.; Liu, Chang

doi:10.1016/j.intermet.2008.08.013

Cited by 18 publications

(4 citation statements)

References 9 publications

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“…This observation agrees with the literature that boron is oxidized at a temperature higher than 600 °C 62 . B 2 O 3 has also been observed upon oxidation of Fe-based metallic glasses containing boron 43,44,63,64 . Thus it can be concluded that the oxide phases grow as a shell over the entire surface of the metallic glass powder particles.…”

Section: Resultsmentioning

confidence: 92%

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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Section: Resultsmentioning

confidence: 92%

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

Paul

Zhang

Biswas

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Thus, the present Tx result is close to that in the literature mentioned above. Oxidation tests and characterization of the substrate and scales were similar to those described previously [10], except for that the heating and cooling rates of the TGA furnace were set at 20 • C/min.…”

Section: Methodsmentioning

confidence: 99%

Air-oxidation of a Co-based amorphous ribbon at 400–600°C

Kai

Lin

Chen

et al. 2011

Journal of Alloys and Compounds

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“…T-IA of bulk crystalline alloys requires several additional processing considerations not critical to that of amorphous/ nanocrystalline systems for which it has previously been demonstrated. [2,3] In addition to the inherent surface oxidation resistance of amorphous and nanocrystalline systems, [8][9][10][11] the much higher temperatures (800-1000 °C, compared to 400-600 °C for amorphous/nanocrystalline) and longer annealing times (hours compared to seconds) make the bulk crystalline workpieces much more susceptible to oxidation if annealed under air. For conventional annealing, this is easily mitigated by flowing an inert or reducing gas through the furnace during the annealing process.…”

Section: Introductionmentioning

confidence: 99%

Spatially Tuned Properties in a Bulk Fe–Co Soft Magnetic Alloy via Transverse Induction Annealing and Feasibility Study for Motor Applications

Paplham,

Greve,

Ghosh

et al. 2023

Adv Eng Mater

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Electric vehicle adoption has seen a dramatic upward trend in the last decade. Maximal efficiency of electric motor technology for maximum range, achieved by minimizing losses experienced by motor stator and rotor, is limited by a trade‐off with high strength, as necessary to withstand torque experienced during operation. Spatial tailoring of magnetic and mechanical properties for optimized magnetic performance while retaining sufficient mechanical strength is a desirable pathway toward improved performance. Here, radiofrequency transverse induction annealing is demonstrated as a novel pathway to continuous spatial variation in microstructure of bulk crystalline soft magnetic alloys, providing a novel processing route to spatially tuned properties. Via local control of grain size, magnetic and mechanical properties may be separately prioritized as functions of position, enabling optimized stator laminations with reduced losses while retaining requisite mechanical strength. Experiment and finite element modeling demonstrate that a cylindrical induction coil can impose significant microstructure and property variation in a Fe–Co bulk crystalline soft magnetic alloy. A basic feasibility study follows, examining improved performance of a motor containing a stator with radial variation in coercivity. Results indicate future potential for co‐optimization of spatial thermal processing of magnetic laminations with motor designs for unprecedented performance.

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The oxidation behavior of an Fe61B15Zr8Mo7Co5Y2Cr2 bulk metallic glass at 550–700 °C

Cited by 18 publications

References 9 publications

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

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

Air-oxidation of a Co-based amorphous ribbon at 400–600°C

Spatially Tuned Properties in a Bulk Fe–Co Soft Magnetic Alloy via Transverse Induction Annealing and Feasibility Study for Motor Applications

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