Initial-stage Sintering Kinetics of Nanocrystalline Tungsten

Srivastav, Ajeet K.; Sankaranarayana, M.; Murty, B.S.

doi:10.1007/s11661-011-0975-6

Cited by 25 publications

(6 citation statements)

References 25 publications

(22 reference statements)

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“…The detailed research on this topic has been reported in our previous work [37]. Briefly, the integral and differential methods deduced from the well-known grain growth power law were used to analyze the nonisothermal sintering data [34,38,39]. Consequently, it was found that, for the W-Y 2 O 3 system, grain boundary diffusion is responsible for the mass transport mechanism during the low-temperature sintering process.…”

Section: +mentioning

confidence: 99%

Enhanced mechanical properties in oxide-dispersion-strengthened alloys achieved via interface segregation of cation dopants

Dong

et al. 2020

Sci. China Mater.

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Section: +mentioning

confidence: 99%

Enhanced mechanical properties in oxide-dispersion-strengthened alloys achieved via interface segregation of cation dopants

Dong

et al. 2020

Sci. China Mater.

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“…The magnified (211) peak as shown in Fig. 1(b) clearly indicates the peak broadening due to crystallite size refinement and induced lattice strain during milling [16,17]. Complete alloying could not be ascertained just by observing the peak profile due to low solute content and almost matching peak positions for both W and Mo [13].…”

mentioning

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 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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“…a) Dependence of sintering temperature of W powder on particle size expressed by the scaling law, along with trajectory fitted by experimental results from previous literatures. [ 77,116,137 ] b) Grain coarsening index (from initial particle size to bulk grain size) versus relative density, for comparison of the differently sized pure W powders. [ 50,77,88,91,98,117,125,130,135,136,138–141 ] c) Comparison of grain size of pure W versus various ODS W, plotted with relative density.…”

Section: Recent Progress In Sintered Refractory Metals Alloys and Com...mentioning

confidence: 99%

Powder Metallurgy Route to Ultrafine‐Grained Refractory Metals

Zhang

et al. 2023

Advanced Materials

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Ultrafine‐grained (UFG) refractory metals are promising materials for applications in aerospace, microelectronics, nuclear energy, and many others under extreme environments. Powder metallurgy (PM) allows to produce such materials with well‐controlled chemistry and microstructure at multiple length scales and near‐net shape manufacturing. However, sintering refractory metals to full density while maintaining a fine microstructure is still challenging due to the high sintering temperature and the difficulty to separate the kinetics of densification versus grain growth. Here an overview of the sintering issues, microstructural design rules, and PM practices towards UFG and nanocrystalline refractory metals are sought to be provided. The previous efforts shall be reviewed to address the processing challenges, including the use of fine/nanopowders, second‐phase grain growth inhibitors, and field‐assisted sintering techniques. Recently, pressureless two‐step sintering has been successfully demonstrated in producing dense UFG refractory metals down to ≈300 nm average grain size with a uniform microstructure and this technological breakthrough shall be reviewed. PM progresses in specific materials systems shall be next reviewed, including elementary metals (W and Mo), refractory alloys (W‐Re), refractory high‐entropy alloys, and their composites. Last, future developments and the endeavor towards UFG and nanocrystalline refractory metals with exceptionally uniform microstructure and improved properties are outlined.

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Initial-stage Sintering Kinetics of Nanocrystalline Tungsten

Cited by 25 publications

References 25 publications

Enhanced mechanical properties in oxide-dispersion-strengthened alloys achieved via interface segregation of cation dopants

Enhanced mechanical properties in oxide-dispersion-strengthened alloys achieved via interface segregation of cation dopants

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

Powder Metallurgy Route to Ultrafine‐Grained Refractory Metals

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