Hello researchers
I want to compare the measured Ni-Co hardness with the calculated hardness by Hall-Petch law
So my question is as follows : How can I find constants of Hall-Petch relation: H0 and K for Ni-Co alloys?
thanks in advance
Best regards
Mohamed
Hi Hamidouche,
The constants are attained experimentally. You need to repeat hardness testing for Ni-Co samples with different grain sizes (D), then plot hardness as a function of D^-1/2.
By doing that you can see if your results obey Hall-Petch equation or not. So it is not correct to say "compare the measured Ni-Co hardness with the calculated hardness by Hall-Petch law".
Dear all
There is a new work that tries to combine both the Hall-Petch and its inverse in one model through presenting a multiscale model that enables description of both the Hall-Petch relation and its inverse in one equation without the need of prior knowledge of the grain size distribution, for more details, please see the following link:
https://www.researchgate.net/publication/324507369_A_new_multiscale_model_to_describe_a_modified_Hall-Petch_relation_at_different_scales_for_Nano_and_micro_materials
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