Grain boundary penetration

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August undefined, 2024

WebOxygen penetration of grain boundaries in nickel and nickel base alloys may produce severe intermediate temperature embrittlement. In the present study, several simple nickel alloys have been doped with sulfur prior to directional solidification. For specimens taken perpendicular to the growth direction, intergranular fracture at room temperature was … WebNov 15, 2008 · Rapid penetration of bismuth from solid Bi2Te3 along grain boundaries in Cu and Cu-based alloys. As well known, bismuth rapidly penetrates into copper grain boundaries at about 550 °C and embrittles copper. In the experiments, the authors have used solid Bi2Te3 for the embrittlement of pure….

Grain Boundary Penetration of Oxygen in Nickel and the …

WebApr 29, 2004 · In order to facilitate quantitative investigation of grain boundary and surface diffusion, a mathematical analysis of the problem has been completed, assuming that … WebJun 8, 2024 · When grains reach a critical size and the volume of grain boundaries represents a significant part of the entire material volume, the ... (S, P, Zn) and elements from the counter body. In addition, oxygen can be detected, however, with larger penetration depth, see Figure 5. The deeper intake of oxygen cannot be explained … phone shop wickford

Grain boundary penetration of nickel by liquid bismuth as a film of ...

WebOct 30, 2000 · Introduction. When a liquid metal is brought into contact with a polycrystalline solid metal, grain boundary penetration can occur. This process is observed if 2γ LS ≤ γ GB, where γ LS is the liquid-solid surface tension and γ GB is the grain boundary surface tension. These tensions are dependent on temperature. WebDescription. This situation can happen in otherwise corrosion-resistant alloys, when the grain boundaries are depleted, known as grain boundary depletion, of the corrosion … WebMay 21, 2024 · As shown in Figure 3c, the penetration of O ions at the grain boundary is faster, and the corrosion depth at the grain boundary is more than four atomic layers. This phenomenon is related to the structure and stability of the grain boundary. As the angle of the grain boundary increases, the corrosion at the grain boundary will be easier. phone shop wimbledon

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The kinetics of gallium penetration into aluminum grain boundaries ...

WebSep 30, 2024 · Grain boundaries will oxidize or corrode more rapidly, usually referred to as grain-boundary penetration or intergranular attack. In under-deposit corrosion and … WebApr 1, 2024 · Grain boundary diffusion of cobalt in Ni of purity level 99.98 wt% was measured over a wide temperature interval using the radiotracer technique and applying the 57Co radioisotope. The diffusion experiments were performed in Harrison’s type B and C kinetic regimes. ... The penetration profiles for this case follow the Gauss solution ... phone shop widnesWebOct 30, 2000 · When a liquid metal is brought into contact with a polycrystalline solid metal, grain boundary penetration can occur. This process is observed if 2γ LS ≤ γ GB, where … how do you spell bon appetit in french

"WebThe influence of different processing routes and grain size distributions on the character of the grain boundaries in Li7La3Zr2O12 (LLZO) and the potential influence on failure … " - Grain boundary penetration

Grain boundary penetration

Grain Boundary - an overview ScienceDirect Topics

WebMar 25, 2003 · We examine different interface energy relationships at the $\mathrm{WC}(101\ifmmode\bar\else\textasciimacron\fi{}0)$ surface in the WC-Co cemented carbide using density-functional theory. To assess the stability of WC/WC grain boundaries, $90\ifmmode^\circ\else\textdegree\fi{}$-twist grain boundaries and a … WebAug 30, 2024 · An abnormal growth of Cu 3 Sn along the grain boundaries of Cu 6 Sn 5 is discovered. • Such abnormal growth occurs only after the exhaustion of Sn. • Rapid grain boundary penetration causes a faster conversion of Cu 6 Sn 5 into Cu 3 Sn. • A mechanism for this abnormal growth is proposed from the Cu and Sn diffusivities.

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WebNov 18, 2005 · The U.S. Department of Energy's Office of Scientific and Technical Information WebMay 11, 2000 · The penetration behavior of gallium into aluminum grain boundaries was compared with Al grain boundary properties estimated from atomistic computer models. …

WebWe report the first application of a five-parameter determination of grain boundary types to grain boundary engineered alpha-brass. The most important findings were that the … WebLegal Notes: Deeds/Senior Rights v. Junior Rights. I have been asked to write a column on legal developments relating to land survey issues. My intention is to devote this column …

Webpreferential grain boundary oxygen penetration was obtained. Complex oxides were identified on the boundaries at depths roughly an order of magnitude greater than those for matrix internal oxidation. It was shown that boron was effective in preventing the preferential grain boundary precipitation during air exposure although the experiment was ... WebJun 22, 2011 · The objective of this research is to generate grain boundary structures over a wide range of degrees of freedom for future use in assessing how grain boundary degrees of freedom impact the …

WebMar 22, 2010 · A tilted grain boundary with a boundary plane normal making an angle less than 10° to the rolling direction allowed for the easy penetration of the lancet …

WebApr 7, 2024 · Additionally, EDS results confirm the Pb-Bi penetration phenomena and the oxide scale structure composed of the magnetite layer, ... It should be noted that preferential diffusion of oxygen along grain boundaries was also confirmed by the inner Fe-Cr spinel oxide layer with the spike-like structure at 450 ℃, and it was most likely an early ... how do you spell bon voyage correctlyWebGrain boundary diffusion (GBD) efficiency of heavy rare-earth (HRE) elements for Nd–Fe–B magnets is closely related to the chemical composition of the initial magnets but this has not been well studied yet. Here, we demonstrated the significant difference in the diffusion efficiency of Tb for Pr–Nd–Fe–B and Nd–Fe–B magnets. phone shop wishawWebThe grain boundary in polycrystalline materials is not an ideal source and sink of atoms, and a critical driving force is needed if boundaries are to operate as a source. The … phone shop wetherbyWebJul 23, 2014 · The impact of the alloy microstructure, grain distribution and grain boundaries on the final de-alloyed material morphology were also analyzed by crystallography analysis with electron back-scattered diffraction (EBSD) by focus ion beam (FIB) surface patterning the surface of the materials prior to performing DA across the … how do you spell bonnie and clydeWebMay 12, 2009 · Polycrystalline materials are composites of crystalline particles or “grains” separated by thin “amorphous” grain boundaries (GBs). Although GBs have been exhaustively investigated at low temperatures, at which these regions are relatively ordered, much less is known about them at higher temperatures, where they exhibit significant … phone shop withamWebJournal Article: Effect of grain-boundary penetration of AISI Type-316 stainless steel by cesium oxides on the biaxial stress-to-failure properties how do you spell bonyWebDec 8, 2024 · Grain boundary penetration (GBP) is an important safety issue where a specific liquid metal penetrates into a solid metal along GBs [4,5,6]. It can lead to embrittlement or corrosion of the solid metal [7,8,9,10]. how do you spell bombed