To measure the true hardness of a grain the plastic zone size must not exceed the size of the grain on which the indentation is made. Now, for a nano-sized grain, the indentation depth must be very shallow in order to confine the plastic zone within that particular grain (I am using nanoindentation with 3-sided pyramid Berkovich indenter). This may result in an indentation size effect. Then how to obtain the hardness efficiently?
Dear Dr. Arka Mandal,
I suggest to have a look at the following papers:
-Grain size effect on the hardness of nanocrystal measured by the nanosize indenter
Xiaoming Liu, Fuping Yuan, YueguangWei
Applied Surface Science, Volume 279, Pages 159-166 (2013)
Available on Rg at: https://www.researchgate.net/publication/257032464_Grain_size_effect_on_the_hardness_of_nanocrystal_measured_by_the_nanosize_indenter
and at:
https://www.sciencedirect.com/science/article/pii/S0169433213007666
-MECHANICAL BEHAVIOR: STRUCTURAL NANOSTRUCTURED MATERIALS
Available at: http://www.wtec.org/loyola/nano/06_02.htm
-Modeling the dependence of strength on grain sizes in nanocrystalline materials
Wei He, Sanjeev D Bhole & Dao Lun Chen
Science and Technology of Advanced Materials, Volume 9, Issue 1 (2008)
Available at: https://www.tandfonline.com/doi/full/10.1088/1468-6996/9/1/015003
Best regards, Pierluigi Traverso
You can view my paper
https://www.researchgate.net/publication/264716390_Degradation_of_Thermomechanical_Performance_and_Lifetime_Estimation_of_Multilayer_Greenhouse_Polyethylene_Films_Under_Simulated_Climatic_Conditions
You can refer the following book.
Hardness Testing
G. Sundararajan, M. Roy, in Encyclopedia of Materials: Science and Technology, 2001
Hi.
You need to use mathematical modeling to estimate the size of the plastic zone.
Valery A.
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