The effect of tip radius on nano-indentation hardness tests

A study on nano-deformation behavior of rheo-formed Al–Si alloy based on depth-sensing indentation with three-dimensional surface analysis

“…A valley of 20 nm depth was observed. Lu and Bogy [15] have reported through finite element analyses that aluminum shows higher pile-up and less elastic recovery than silicon. As previously mentioned, the microstructure of semi-solid processed Al-Si alloy usually consists of a ␣-Al globular structure and Al/Si eutectic phases.…”

Stress induced phase transitions in silicon

“…The Voigt and Reuss averages are ν = 0.218 and ν = 0.228, respectively (Hull, 1999). However, often values around ν = 0.275 are cited (Brantley, 1973;Hess, 1996;Lu and Bogy, 1995;Youn and Kang, 2005;Yan et al, 2001) and successfully used. Wortman and Evans (1965) noted that the Poisson's ratio varies over a large range of values depending on the crystal orientation with bounds given by 0.048 < ν < 0.403.…”

Nanoindentation of thin films: Simulations and experiments

“…This difference could be because the indenter tip is not perfectly spherical in the experiments. Indeed, the shape of the indenter can make a significant difference [34][35][36] because the contact area evolution, as the indentation proceeds, will depend on the indenter shape. Another possible explanation for this discrepancy is the role played by pre-existing defects in the experimental film.…”