Question about Particle in Grain Boundary

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Grain boundaries can cut through particles rather than looping around them due to the instability of the grain boundary, which is where defects tend to congregate. Dislocations are also relevant in this context, as they can either cut through or loop around particles, influencing material strength. The discussion references key literature that explores grain boundary migration and interactions with precipitates. Understanding these mechanisms is crucial for predicting material behavior under stress. Overall, the relationship between grain boundaries and particles is complex and significantly impacts material properties.
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Why does the grain boundary cut directly through a particle, instead of looping around the particle's surface?
 
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Hi etmsni, welcome to PF!

It sounds like you might be talking about dislocations rather than grain boundaries; two models of precipitate strengthening involve dislocations cutting through vs. looping around a particle. It this possibly the case?
 
Actually, I would like to ask about the dislocation case too. What I originally meant was, could what occurs to dislocations also occur for grain boundaries? I'm not very clear on the concepts.
 
Suggest looking at Grant et al., "Grain-boundary migration in single-phase and particle-containing materials," J Mater Sci (1984) and Randle et al., "Interactions of grain boundaries with coherent precipitates during grain growth," Acta Metall (1986).
 
there are two kinds of fracture: one is through the grain, and the other is along the grain. usually, the grain boundary is the place where defects get together, so it is the most un-stable. If in a ceramic, fracture will be the grain boundary
 

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