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Open AccessArticle

The Indentation-Induced Pop-in Phenomenon and Fracture Behaviors of GaP(100) Single-Crystal

School of Mechanical and Automotive Engineering, Xiamen University of Technology, Xiamen 361024, China
Department of Materials Science and Engineering, I-Shou University, Kaohsiung 840, Taiwan
Department of Materials Engineering, Ming Chi University of Technology, New Taipei City 243, Taiwan
Center for Plasma and Thin Film Technologies, Ming Chi University of Technology, New Taipei City 24301, Taiwan
Department of Mechanical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
Department of Electrophysics, National Chiao Tung University, Hsinchu 300, Taiwan
Author to whom correspondence should be addressed.
Micromachines 2019, 10(11), 752;
Received: 26 September 2019 / Revised: 31 October 2019 / Accepted: 31 October 2019 / Published: 2 November 2019
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 ± 1.2 GPa and 152.6 ± 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 ± 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-Text
Keywords: GaP(100) single crystal; pop-in; nanoindentation; fracture GaP(100) single crystal; pop-in; nanoindentation; fracture
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Chiu, Y.-J.; Jian, S.-R.; Lee, J.-W.; Juang, J.-Y. The Indentation-Induced Pop-in Phenomenon and Fracture Behaviors of GaP(100) Single-Crystal. Micromachines 2019, 10, 752.

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