On correlation between densification kinetics during spark plasma sintering and compressive creep of B2 aluminides

Chawake, Niraj; Koundinya, N.T.B.N.; Srivastav, Ajeet K.; Kottada, Ravi Sankar

doi:10.1016/j.scriptamat.2015.05.021

Cited by 17 publications

(3 citation statements)

References 32 publications

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“…Subsequently, the milled powders were densified to ~95% relative density using spark plasma sintering up to 1600 °C. The enhanced localized Joule heating due to dynamically evolved porous structure could be attributed for the densification during spark plasma sintering.Spark plasma sintering (SPS) has shown a great promise over the last few decades due to several advantages than the conventional sintering processes, such as densifying variety of materials to fully dense structure at a lower temperature in a short duration of time with a possibility of retaining the fine grain structure [1][2][3]. These benefits are primarily attributed to localized heating mechanism [4,5].…”

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confidence: 99%

“…Spark plasma sintering (SPS) has shown a great promise over the last few decades due to several advantages than the conventional sintering processes, such as densifying variety of materials to fully dense structure at a lower temperature in a short duration of time with a possibility of retaining the fine grain structure [1][2][3]. These benefits are primarily attributed to localized heating mechanism [4,5].…”

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confidence: 99%

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Localized pore evolution assisted densification during spark plasma sintering of nanocrystalline W-5wt.%Mo alloy

Srivastav¹,

Chawake²,

Yadav³

et al. 2019

Scripta Materialia

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The present work reports the role of different atomic mobility induced localized pore evolution on densification during spark plasma sintering of nanocrystalline W-Mo alloy powder. The shrinkage (or expansion) behavior of cold compacted milled powders was studied using dilatometry during non-isothermal sintering up to 1600 °C. Subsequently, the milled powders were densified to ~95% relative density using spark plasma sintering up to 1600 °C. The enhanced localized Joule heating due to dynamically evolved porous structure could be attributed for the densification during spark plasma sintering.Spark plasma sintering (SPS) has shown a great promise over the last few decades due to several advantages than the conventional sintering processes, such as densifying variety of materials to fully dense structure at a lower temperature in a short duration of time with a possibility of retaining the fine grain structure [1][2][3]. These benefits are primarily attributed to localized heating mechanism [4,5]. However, localized heating mechanisms are highly dependent on the nature of contact between the particles in due course of sintering process of conductive materials. It has been established that the localized heating and electrosintering mechanisms will be highest and largely contributing at the initial stages of sintering (with more point contacts and higher current) and gradually decreases with time [6,7]. The nature

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confidence: 99%

Localized pore evolution assisted densification during spark plasma sintering of nanocrystalline W-5wt.%Mo alloy

Srivastav¹,

Chawake²,

Yadav³

et al. 2019

Scripta Materialia

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“…The remaining constants can be A Deformation Mechanism Map for Incoloy 800H Optimized Using the Genetic Algorithm 5 estimated using similar methods. A small fraction of examples of this approach from within the last decade include Ueda et al, [29] Matsunaga et al, [30] Kawasaki and Langdon, [31] and Chawake et al [32] The analytical approach contains a number of significant flaws. It involves several subjective assumptions, most particularly when estimating a priori where the changes in the dominant mechanism occur in the data before fitting.…”

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A Deformation Mechanism Map for Incoloy 800H Optimized Using the Genetic Algorithm

Beardsley

Bishop

Kral

2019

Metall Mater Trans A

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A total of fifty-eight Incoloy 800H samples were creep tested between temperatures of 1023-1293 K, stresses of 14.1-105 MPa, and average grain sizes of 87.7-315 µm. Combined with data obtained by the National Institute for Materials Science (NIMS), a deformation mechanism map (DMM) for Incoloy 800H was produced. Optimization of the fit of the constitutive creep equations to the experimental data was performed using a global search iterative numerical optimization tool called a genetic algorithm (GA). It was found that the data were well represented by both high-temperature and low-temperature power-law creep mechanisms, but the extent of the influence of diffusion-based creep mechanisms, most specifically Coble creep, will require further investigation. A training and test method was performed to validate the solution and to test the extrapolability of the dataset. It was determined that the extrapolability of the data in all directions of the DMM was generally low.

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Creep deformation behavior during densification of ZrB2-SiBCN ceramics with ZrO2 additive

et al. 2020

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ZrB2-SiBCN ceramics with ZrO2 additive are hot-pressed under a constant applied pressure. The densification behavior of the composites is studied in a view of creep deformation by means of the Bernard-Granger and Guizard model. With determination of the stress exponent (n) and the apparent activation energy (Qd), the specific deformation mechanisms controlling densification are supposed. Within lower temperature ranges of 1300–1400 °C, the operative mechanism is considered to be grain boundary sliding accommodated by atom diffusion of the polymer-derived SiBCN (n = 1, Qd = 123±5 kJ/mol) and by viscous flow of the amorphous SiBCN (n = 2, Qd = 249±5 kJ/mol). At higher temperatures, the controlling mechanism transforms to lattice or intra-granular diffusion creep (n = 3–5) due to gradual consumption of the amorphous phase. It is suggested that diffusion of oxygen ions inside ZrO2 into the amorphous SiBCN decreases the viscosity, modifies the fluidity, and contributes to the grain boundary mobility.

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On correlation between densification kinetics during spark plasma sintering and compressive creep of B2 aluminides

Cited by 17 publications

References 32 publications

Localized pore evolution assisted densification during spark plasma sintering of nanocrystalline W-5wt.%Mo alloy

Localized pore evolution assisted densification during spark plasma sintering of nanocrystalline W-5wt.%Mo alloy

A Deformation Mechanism Map for Incoloy 800H Optimized Using the Genetic Algorithm

Creep deformation behavior during densification of ZrB2-SiBCN ceramics with ZrO2 additive

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