Question about Hall Petch equation

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In summary, the two stress-related values that should be entered according to the Hall-Petch equation are k and sigma0, which are constants for a material and their values are dependent on the material itself.
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da_coolest
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according to the equation what are the two stress related value that should be entered? (the value before the = and the value after = sing?




this is a silly question. but i couldn't find any answer and I am in a hurry!

Thanks in advance
 
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  • #3
k and sigma0 are constant for a material and their values depend purely on the material.
 

What is the Hall Petch equation?

The Hall Petch equation is an empirical relationship between the yield strength of a material and its grain size. It states that as the grain size decreases, the yield strength of the material increases.

What factors influence the Hall Petch equation?

The Hall Petch equation is influenced by the grain size, the strength of the grain boundaries, and the dislocation density within the material.

What is the significance of the Hall Petch equation in materials science?

The Hall Petch equation is important in materials science because it helps us understand the relationship between the microstructure of a material and its mechanical properties. It is also used to predict the strength of a material at different grain sizes, which is useful for designing and selecting materials for specific applications.

What are the limitations of the Hall Petch equation?

The Hall Petch equation is limited in its applicability to materials with a specific type of microstructure, such as metals with equiaxed grains. It also does not account for other factors that can affect material strength, such as impurities or defects.

How is the Hall Petch equation derived?

The Hall Petch equation is based on the concept of grain boundary strengthening, where the strength of a material is increased by decreasing the grain size and increasing the density of grain boundaries. It was first proposed by E.O. Hall and N.J. Petch in the 1950s and has been further developed and refined by subsequent studies.

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