Grain boundary sliding in creep

In summary, engineers can prevent grain boundary sliding and reduce the likelihood of creep by designing components with larger grains or a columnar grain structure. This is because these methods prevent grains from sliding against each other. However, there may be some confusion about whether columnar grains are more prone to sliding since they are parallel. Can you provide more information on this?
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kelvin490
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To prevent grain boundary sliding so that creep is less likely to occur, usually engineers would design components of larger grains or have columnar grain structure to prevent grain-boundary sliding. Why this two method can prevent grain-boundary sliding? For columnar grains, would they be more easy to slide against each other since the grains are parallel?
 
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I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
 
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I would like to know why grain boundary sliding can be prevented by columnar grain arrangement? what does it related to the mechanism of creep?
 

FAQ: Grain boundary sliding in creep

What is grain boundary sliding in creep?

Grain boundary sliding in creep refers to the gradual movement or deformation of a material along its grain boundaries under a constant load or stress. This process is a common mechanism of creep deformation in polycrystalline materials.

How does grain boundary sliding contribute to creep deformation?

Grain boundary sliding allows for the redistribution of stress within a material, reducing the overall stress concentration and thereby increasing its resistance to deformation. It also facilitates the accommodation of thermal and mechanical stresses, allowing the material to deform without fracturing.

What factors influence grain boundary sliding in creep?

The rate and extent of grain boundary sliding in creep are influenced by several factors, including temperature, applied stress, grain size, and the presence of impurities or second-phase particles. Higher temperatures and stresses, as well as smaller grain sizes, tend to promote grain boundary sliding.

How is grain boundary sliding measured and studied?

Grain boundary sliding can be studied through various techniques, including in situ observations, electron microscopy, and mechanical testing. The amount of grain boundary sliding can be quantified using strain measurements and models such as the Coble creep model or the Norton creep law.

What are the practical applications of understanding grain boundary sliding in creep?

Understanding grain boundary sliding in creep is crucial for the design and engineering of materials that are subjected to long-term stress or high temperatures. It can also help in the development of more durable and reliable materials for various applications, such as in power plants, aerospace, and structural engineering.

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