%0 Journal Article
%T The Indentation-Induced Pop-in Phenomenon and Fracture Behaviors of GaP(100) Single-Crystal
%J Micromachines | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/mi10110752
%X The deformation behaviors and fracture features of GaP(100) single-crystal are investigated by using nano- and micro-scale indentation techniques. The hardness and Young¡¯s modulus were measured by nanoindentation using a Berkovich diamond indenter with continuous contact stiffness measurements (CSM) mode and the values obtained were 12.5 ¡À 1.2 GPa and 152.6 ¡À 12.8 GPa, respectively. In addition, the characteristic ¡°pop-in¡± was observed in the loading portion of load-displacement curve, which was caused by the nucleation and/or propagation of dislocations. An energetic estimation methodology on the associated nanoindentation-induced dislocation numbers resulting from the pop-in events was discussed. Furthermore, the Vickers indentation induced fracture patterns of GaP(100) single-crystal were observed and analyzed using optical microscopy. The obtained fracture toughness KC of GaP(100) single-crystal was ~1.7 ¡À 0.1 MPa¡¤m1/2, which is substantially higher than the KIC values of 0.8 MPa¡¤m1/2 and 1.0 MPa¡¤m1/2 previously reported for of single-crystal and polycrystalline GaP, respectively. View Full-Tex
%U https://www.mdpi.com/2072-666X/10/11/752