Optimisation of high energy ball milling parameters to synthesize oxide dispersion strengthened Alloy 617 powder and its characterization

Sivakumar, M.; Dasgupta, Arup; Ghosh, C.; Sornadurai, D.; Saroja, S.

doi:10.1016/j.apt.2019.07.014

Cited by 17 publications

(7 citation statements)

References 44 publications

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“…28,29 Although, studies in the analogue compound, Na3PS4, have shown that mechanochemical treatment can introduce discrepancy between local and long-range structures, 30 our complimentary PXRD, Raman, and NMR analyses confirm that the crystallinity (sharpness of the diffraction peaks) decreases in NSS-CMC post mechanochemical treatment but retains the tetragonal crystalline symmetry. 31 Similar results are observed for the 23 Na MAS NMR data in Fig 1C, whereby a unique quadrupolar lineshape was observed in 23 Na NMR spectrum of NSS-CMC pre-ball milling (NSS-CMC noBM), consistent with two sodium environments experiencing motion as demonstrated in its analogue Na3PS4 tetragonal phase. 32 As crystallinity decreases, the distinctive quadrupolar lineshape smooths and broadens due to the distribution in EFG and reduction in long-range order introduced through mechanochemical treatments.…”

Section: Scheme 1 Formation Of Nss-cmc Compositessupporting

confidence: 82%

A Cellulose Encapsulated Composite Electrolyte Design: Towards Chemically and Mechanically Enhanced Solid-sodium Batteries

Dong,

Xie,

et al. 2024

Preprint

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Replacing liquid electrolytes with solid ionic conductors attracts increasing attention due to the potential of improved battery safety. Solid-state batteries show potential for further increased energy/power density by eliminating the use of packaging accessories for unit cells. Sulfide- and halide-based ceramic ionic conductors exhibit comparable ionic conductivity with liquid electrolytes. These materials, however, are inherently brittle, making them unfavorable for applications. Here, we report a mechanically enhanced composite Na+ conductor that contains 92.5 wt% of sodium thioantimonate (Na3SbS4, NSS) and 7.5 wt% of sodium carboxymethylcellulose (CMC); the latter serves as the binder and an electrochemically inert encapsulation layer. The ceramic and binder constituents were integrated at the particle level, providing ceramic NSS-level Na+ conductivity in the NSS-CMC composite, the more than five-fold decrease of electrolyte thickness obtained in NSS-CMC composite electrolytes provided a five-fold increase in Na+ conductance compared to NSS ceramic pellets. Resulting from the CMC encapsulation, this NSS-CMC composite shows increased moisture resistivity and electrochemical stability, which significantly promotes the cycling performance of NSS- based solid-state batteries, and improves ductility of the material. This work demonstrates a well-controlled, orthogonal process of ceramic-rich, composite electrolyte processing – independent streams for ceramic particle formation along and binder encapsulation in a solvent-assisted environment. This work provides insights into the interplay among the solvent, the polymeric binder, and the ceramic particles in composite electrolyte synthesis, and implies the critical importance of identifying the appropriate solvent/binder system for the precise control of this complicated process. Finally, the work also provides valuable insights into the potential of designing mechanically tailorable battery components via fundamental understanding of the effect of the constituents on the overall composite ductility.

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Section: Scheme 1 Formation Of Nss-cmc Compositessupporting

confidence: 82%

A Cellulose Encapsulated Composite Electrolyte Design: Towards Chemically and Mechanically Enhanced Solid-sodium Batteries

Dong,

Xie,

et al. 2024

Preprint

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“…Those results are summarized in Table 2 together with the crystallite sizes evaluated by the Rietvield analysis. The obtained values of deformation energy and the fact that the maximal ∆T at 700 RPM was approximately 80 K, even if only the ideal inelastic behaviour was considered [29], suggest that the imposed deformation energy increased the diffusion and can initiate formation of new phases. Lastly, the particles milled for 30 minutes at 700 RPM possesed an uniform distribution of individual elements across the particles and the phases CaZn13, MgZn2 and Mg2Zn11 were found in the material by the XRD.…”

Section: Fig 1 Micrographs Of Zinc (A) Magnesium (B) and Calcium Oxmentioning

confidence: 90%

“…The dependence of the diffusion process on the temperature is well know. However, the deformation energy seems to be more important in the case of high energy ball milling [29]. In order to emhasize this statement, Collision energy (Ec) was calculated for all milling conditions according to Eq.…”

Section: Fig 1 Micrographs Of Zinc (A) Magnesium (B) and Calcium Oxmentioning

confidence: 99%

Microstructural characterization and optimization of the ZnMg0.8(CaO)0.26 alloy processed by ball milling and subsequent extrusion

Pinc¹,

Školáková²,

Veřtát³

et al. 2020

Manufacturing Technology

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Zinc is one of the most promising elements for the preparation of biodegradable metallic implants. Despite low mechanical performance for load-bearing applications, the degradation characteristics of pure zinc belong to the best from all significant biodegradable metals (Zn, Mg, Fe). The enhancement of the mechanical properties is often reached using various methods of material processing, leading to grain refinement and subsequent enhancement of the mechanical properties. In this study, the microstructure, phase composition and the possible mechanisms of intermetallic phase formation in the ZnMgCaO alloy prepared by high energy ball milling and consolidated by extrusion were studied. Formation of the Mg2Zn11, MgZn2 and CaZn13 phases during the material processing was confirmed. The creation of the phases was, with high probability, significantly affected by the magnitudes of individual components of internal energy. The increment of the internal energy led to the formation of stable Mg2Zn11 phase as well as to CaZn13 formation. Based on our results and the characterization of the microstructure, the most suitable conditions for the preparation of a ZnMgCaO alloy were found.

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“…Alloy 617 ODS was synthesized by mechanical milling of Alloy 617 prealloyed powder (nominal composition is Ni–20Cr–10Co–8Mo–3Fe–0.8Al (in wt%) (Sivakumar et al, 2019) together with 0.6 wt% of Y 2 O 3 nano powder in a high energy ball mill from Retsch, Emax. The milling was performed at a constant high speed of 1,000 rpm with water cooling (12°C).…”

Section: Methodsmentioning

confidence: 99%

“…It is well established that the high-temperature creep resistance of such alloys is enhanced by oxide dispersions which provide for dislocation entanglement by the stable oxide particles in the metallic matrix. Such dispersion strengthening can be achieved in various alloy systems, such as in ferritic steels (Ukai & Fujiwara, 2002; Hirata et al, 2011; Saroja et al, 2011; Odette, 2014; Pasebani et al, 2015; Oono et al, 2016; Raghavendra et al, 2018), austenitic steels (Kim et al, 2008; Wang et al, 2015), and Ni-base superalloys (Park et al, 2012; Tang et al, 2012; Aghamiri et al, 2015; Sivakumar et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Complexity of Nano-Dispersoids in the Oxide Dispersion Strengthened Alloy 617

Sinha

Dasgupta

Sivakumar

et al. 2022

Microscopy and Microanalysis

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Nanocrystalline oxides are mainly responsible for Ni-base oxide dispersion strengthened (ODS) superalloys excellent thermo-mechanical properties. To establish the microstructural correlations between the metallic matrix and various oxide dispersoids, we report here the atomic-scale structure and chemistry of the complex nano-oxide dispersoids. Ultrahigh-resolution Cs-aberration-corrected scanning transmission electron microscopy (STEM) based techniques have been used to resolve nano-dispersoids in the Alloy 617 ODS. These nano-oxides, interestingly, possess a variety of high-angle annular dark-field (HAADF) contrasts, that is, bright, dark, and bi-phases. Both the light and heavy atoms have been found to be present in Y–Al–O complex-oxide nanostructures in varying quantities and forming a characteristic interface with the metallic matrix. In overcoming the limitation of conventional STEM-HAADF imaging, the integrated differential phase-contrast imaging technique was employed to investigate the oxygen atoms along with other elements in the dispersoids and its interface with the matrix. The most intriguing aspect of the study is the discovery of a few atoms thick Al2O3 interlayer (shell) around a monoclinic Y–Al–O core in the Ni-matrix. On the other hand, when the dispersoid is a hexagonal type Y–Al–O complex, the interface energy is already low, maintaining a semi-coherent interface and it was devoid of a shell.

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Optimisation of high energy ball milling parameters to synthesize oxide dispersion strengthened Alloy 617 powder and its characterization

Cited by 17 publications

References 44 publications

A Cellulose Encapsulated Composite Electrolyte Design: Towards Chemically and Mechanically Enhanced Solid-sodium Batteries

A Cellulose Encapsulated Composite Electrolyte Design: Towards Chemically and Mechanically Enhanced Solid-sodium Batteries

Microstructural characterization and optimization of the ZnMg0.8(CaO)0.26 alloy processed by ball milling and subsequent extrusion

Unraveling the Complexity of Nano-Dispersoids in the Oxide Dispersion Strengthened Alloy 617

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