Kinetics of Coarsening of Spherical Particles in a Liquid Matrix

Sarian, S.; Weart, H. W.

doi:10.1063/1.1708583

Cited by 100 publications

(26 citation statements)

References 5 publications

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“…The most effective inhibitors reduce the number of reaction sites, leading to the emergence of flat-faced grains or core-rim grains, where the chemistry changes from the outside to the inside [133][134][135][136]. In diffusion-controlled growth, the grains remain rounded with an abundance of atomic steps, so there is no limitation from the population of interfacial sites available for dissolution or precipitation [9,131,137].…”

Section: Densificationmentioning

confidence: 99%

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Review: liquid phase sintering

2009

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Liquid phase sintering (LPS) is a process for forming high performance, multiple-phase components from powders. It involves sintering under conditions where solid grains coexist with a wetting liquid. Many variants of LPS are applied to a wide range of engineering materials. Example applications for this technology are found in automobile engine connecting rods and high-speed metal cutting inserts. Scientific advances in understanding LPS began in the 1950s. The resulting quantitative process models are now embedded in computer simulations to enable predictions of the sintered component dimensions, microstructure, and properties. However, there are remaining areas in need of research attention. This LPS review, based on over 2,500 publications, outlines what happens when mixed powders are heated to the LPS temperature, with a focus on the densification and microstructure evolution events.

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Section: Densificationmentioning

confidence: 99%

“…Reaction control is observed in mixed phase systems, such as complex cemented carbides from WC, VC, TiC, or TaC with a cobalt-based liquid [130][131][132]. Grain growth inhibitors slow interfacial reaction events.…”

Section: Densificationmentioning

confidence: 99%

Review: liquid phase sintering

2009

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“…Sarian and Weart 6) showed nearly cubic NbC grains in an NbCFe alloy (with about 20 wt % Fe) sintered at 1300°C, but the edges of the grains, particularly the small grains, were rounded. Warren 1), 2) also observed round-edged cube-shaped NbC grains in NbCNi and NbCCo sintered at temperatures between 1380 and 1550°C.…”

Section: Resultsmentioning

confidence: 99%

Effect of ball-milling on dislocation generation and grain growth behavior in sintered NbC–Co

Yang

Yoon

Kang

2012

J. Ceram. Soc. Japan

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Widely employed in the fabrication of structural ceramics, ball-milling is a process of mixing or pulverizing powders. Despite its popular use, the effects of ball-milling on grain growth behavior are nevertheless still obscure. In this study, we investigated the effects of ball-milling on grain growth behavior in light of the crystal growth theory in a model NbCCo system with partially faceted grains. Two kinds of 90NbC10Co (wt %) samples, with and without ball-milling, were prepared. With ball-milling, the density of dislocations increased considerably. In samples without ball-milling, abnormal grain growth (AGG) occurred from the beginning of liquid phase sintering at 1450°C. In contrast, in samples with ball-milling, grain growth behavior was quite normal and large abnormal grains did not appear up to 96 h of sintering. These observations can be explained in terms of the change in the critical driving force for appreciable growth with dislocation density. The present results also demonstrate that proper mechanical treatment (ball-milling) can be useful for suppressing AGG in cemented carbide systems.

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“…It was recognized quite some time ago, by Lifshitz and Slyozov themselves [1] and, for example, by Asimow [3] and Sarian and Weart [4], that for finite values of f e , the kinetics of coarsening must increase faster than predicted by LSW. The physical reason for this is straightforward.…”

Section: Introductionmentioning

confidence: 99%

Non-integer temporal exponents in trans-interface diffusion-controlled coarsening

Ardell

2016

J Mater Sci

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The kinetics of c 0 -type (Ni 3 X) precipitate growth and solute depletion in Ni-Al, Ni-Ga, Ni-Ge, Ni-Si, Ni-Ti and Ni-Al-Cr alloys is successfully predicted by the trans-interface diffusion-controlled theory of coarsening using non-integer temporal exponents, n, satisfying 2 B n B 3, which are obtained from analyses of particle size distributions (PSDs). The origin of non-integer n is concentrationdependent diffusion through the c/c 0 interface. The literature on diffusion of Al and Ni in Ni 3 Al is specifically examined. It is shown unequivocally that the concentration-dependent diffusion of Al can account semi-quantitatively for the value of n that successfully describes the PSDs and kinetics of coarsening of the c 0 precipitates. There is no need to invoke a particle size-dependent c/c 0 interface width, as was done in prior work. It is argued that existing theory and computational modeling of coarsening in systems with highly disparate diffusion mobilities in both phases do not correctly represent the mobilities in the matrix, precipitate, and interface in Ni-Al alloys. These theories predict temporal exponents satisfying 3 B n B 4, for which there is no experimental support.

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Kinetics of Coarsening of Spherical Particles in a Liquid Matrix

Cited by 100 publications

References 5 publications

Review: liquid phase sintering

Review: liquid phase sintering

Effect of ball-milling on dislocation generation and grain growth behavior in sintered NbC–Co

Non-integer temporal exponents in trans-interface diffusion-controlled coarsening

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