OK, you can easily check here if the stress will be high enough to deform plastically the material. https://amesweb.info/HertzianContact/HertzianContact.aspx
Following what you give in terms of numbers, you achieve a shear stress higher than 1GPa in the specimen at 10% of indentation. Make sure you have the right units (GPa and not MPa for example), to be consistent with the applied load in N and the indenter in m or mm...
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