Growth behavior of rounded (Ti,W)C and faceted WC grains in a Co matrix during liquid phase sintering

Yoon, Byung-Kwon; Lee, Bo-Ah; Kang, Suk–Joong L.

doi:10.1016/j.actamat.2005.06.021

Cited by 143 publications

(94 citation statements)

References 26 publications

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“…This is also shown in the work of Y oon et al 22 If the starting mean size of the WC powder was fine (0.5J.tm), then abnormal grain growth occurred after sintering at 1450°C for 1 hour (Fig. 2).…”

Section: Grain Growth In Two-phase Systemssupporting

confidence: 73%

Effect of Interface Structure on Microstructural Evolution in Polycrystals

Fisher

Kang

2012

Trans. Mat. Res. Soc. Japan

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ABSTRACT.Control of microstructure during processing is necessary to produce materials with optimum properties. Grain growth behaviour in both two-phase (solid/liquid) and single phase materials is strongly dependant on interface structure, either rough (atomically disordered) or faceted (atomically ordered). Materials with disordered interfaces show normal grain growth behaviour, whereas materials with ordered interfaces can show different types of non-normal grain growth, which are system and timedependant: pseudo-normal, abnormal, stagnant and delayed abnormal. Examples of the different types of grain growth are given from ceramic and metallic systems, and general principles of microstructure evolution with respect to interface structure are presented.

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Section: Grain Growth In Two-phase Systemssupporting

confidence: 73%

Effect of Interface Structure on Microstructural Evolution in Polycrystals

Fisher

Kang

2012

Trans. Mat. Res. Soc. Japan

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“…This is also shown in the work of Yoon et al 22 If the starting mean size of the WC powder was fine (0.5mm), then abnormal grain growth occurred after sintering at 1450°C for 1 hour (Fig. 2).…”

Section: Grain Growth In Two-phase Systemssupporting

confidence: 50%

“…Examples of systems with ordered solid/liquid interfaces which display these different types of grain growth behaviour include MgO 22 Rounded (Ti,W)C and faceted WC grains grow together in the same liquid Co matrix. The rounded (Ti,W)C grains show normal grain growth whereas the faceted WC grains show non-normal (nonstationary) grain growth (Fig.…”

Section: Grain Growth In Two-phase Systemsmentioning

confidence: 99%

Effect of Interface Structure on Microstructural Evolution in Polycrystals

Fisher

Kang

2010

Trans. Mat. Res. Soc. Japan

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“…Shape changes accompanying grain growth in the dual phase hexagonal carbides (WC-Co, WC-Ni and even pure WC) are usually attributed to the strong difference in surface energies between the prismatic and basal planes which subsequently lead to angular and faceted grains [4]. Secondary recrystallization or abnormal grain growth (AGG) is suspected to be a consequence of surface ledges produced by screw dislocations, stacking faults or twin defects on specific crystal planes which act as 2D nucleation sites for growth at later stages [5,6].…”

Section: Introductionmentioning

confidence: 99%

The influence of Si on the microstructure and sintering behavior of ultrafine WC

Kumar

Watabe

Kurokawa

2012

Philosophical Magazine

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The microstructure of sintered nano scale tungsten carbide powders with 1wt. % Si addition was found to be populated by an abnormally large number of elongated grains. Interrupted sintering experiments were conducted to clarify the origins of the excessive abnormal grain growth seen in the microstructure. It was observed that rapid coarsening occurred at high temperatures owing to the formation of a liquid phase. However, the grain shape evolution during this coarsening period was found to be a consequence of excessive stacking faults and micro twins on the basal planes probably generated by reaction of WC with Si. Analyses of the microstructures and the isothermal and non isothermal coarsening behaviors suggested that the platelet morphology evolved by defect-assisted nucleation and growth on faceted grains. Based on experimental evidence from samples interrupted at low temperatures and crystal growth theories, we discuss the possible mechanisms that eventually led to the rampant platelet-type morphology. Further, the influence of such rapid grain growth on the shrinkage rate during sintering is also discussed. In comparison with the cyclic coarsening-densification process of sintering in pure nano scale WC, the addition of Si leads to only two distinct sintering stages: either densification dominated or coarsening dominated. Concurrent densification and coarsening cannot be sustained particularly in the presence of a liquid phase that significantly enhances coarsening.

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Growth behavior of rounded (Ti,W)C and faceted WC grains in a Co matrix during liquid phase sintering

Cited by 143 publications

References 26 publications

Effect of Interface Structure on Microstructural Evolution in Polycrystals

Effect of Interface Structure on Microstructural Evolution in Polycrystals

Effect of Interface Structure on Microstructural Evolution in Polycrystals

The influence of Si on the microstructure and sintering behavior of ultrafine WC

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