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Results of an investigation of the nature of load-displacement curves, pop-in events and

indentation size effect of the (001) and (100) faces of KDP crystals by nanoindentation

deformation under Berkovich indenter at different loads are presented and discussed.

It was found that: (1) load-displacement curves reveal numerous pop-in events but these

pop-in events occur less frequently on the (100) face than on the (001) face, (2) different

segments of individual load-displacement curves are explained by plastic deformation

under the indenter, (3) the value of indentation displacement excursion d of pop-in events

lies between 3 and 20 nm, (4) nanohardness H lies between 2.2 and 3.3 GPa and between

1.6 and 3.2 GPa for the (001) and (100) faces, respectively, and is comparable with that

reported before, whereas penetration independent hardness H0 obtained from analysis

of the H(h) data is 2.04 and 1.41 GPa for the (001) and (100) faces, respectively.
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