The reason for this difference is not known, but possibly the lower load (300 lN) and thus the lower indentation depth (about 0.03– 0.13 lm) compared to the 2 lm indentation depth observed by Whitenack et al. (2010) lead to strain hardening.
Thereason for this difference is not known, but possibly the lower load(300 lN) and thus the lower indentation depth (about 0.03–0.13 lm) compared to the 2 lm indentation depth observed byWhitenack et al. (2010) lead to strain hardening.