Topic
Carbide
About: Carbide is a research topic. Over the lifetime, 36331 publications have been published within this topic receiving 503586 citations.
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01 Feb 1998-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the shape development of WC crystals in cemented carbides during liquid phase sintering was studied and the relative influence of shape relaxation and carbide crystal growth processes on the shape was discussed.
Abstract: A study has been made of the shape development of WC crystals in cemented carbides during liquid phase sintering. The relative influence of shape relaxation and carbide crystal growth processes on the shape is discussed. An effect of titanium additions on the shape of WC crystals in WC–Ni cemented carbides was observed. A shape parameter referred to as shape equiaxiality has been defined and calculated theoretically for various triangular prisms. The observed change of shape equiaxiality with titanium concentration in the binder phase of WC–Ni cemented carbides is discussed in terms of titanium segregation at the interphase boundary.
104 citations
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TL;DR: In this paper, the authors used an intermittent microwave heating (IMH) method to prepare Pt modified with tungsten carbide nanocrystals (the catalyst denotes as PtPd-WC/C) for hydrogen evolution reaction in the acidic media.
104 citations
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TL;DR: In this paper, the authors carried out extensive first-principles calculations based on density functional theory to investigate the interaction of H with TiC precipitates that are assumed to be efficient trapping agents mitigating HE in advanced high-strength steels.
Abstract: A correct description of hydrogen diffusion and trapping is the prerequisite for an understanding of the phenomenon of hydrogen embrittlement. In this study, we carried out extensive first-principles calculations based on density functional theory to investigate the interaction of H with TiC precipitates that are assumed to be efficient trapping agents mitigating HE in advanced high-strength steels. We found that there exists a large variety of possible trapping sites for H associated with different types of interfaces between the TiC particle and the Fe matrix, with misfit dislocations and other defects at these interfaces, and with carbon vacancies in TiC. The most efficient trapping by more than 1 eV occurs at carbon vacancies in the interior of TiC particles. However, these traps are difficult to populate at ambient temperatures since the energy barrier for H entering the particles is high. H trapping at the semicoherent interfaces between the TiC particles and the Fe matrix is moderate, ranging from 0.3 to 0.5 eV. However, a sufficiently large concentration of the carbide particles can significantly reduce the amount of H segregated at dislocation cores in the Fe matrix. A systematic comparison of the obtained theoretical results with available experimental observations reveals a consistent picture of hydrogen trapping at the TiC particles that is expected to be qualitatively valid also for other carbide precipitates with the rock-salt crystal structure.
104 citations
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TL;DR: In this article, a high-entropy carbide ceramics (HECC) with a single-phase rock-salt structure was synthesized by spark plasma sintering, which was irradiated by 3-MeV Zr ions to 20 dpa at 25, 300, and 500°C.
104 citations
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TL;DR: In this article, the influence of roughness on general corrosion and pitting of (FeCoCrNi)0.89(WC) 0.11 high-entropy alloy composite in 3.5 wt.% NaCl solution was studied by electrochemical measurements and composition characterization.
103 citations