Chiu Yi-Jui, Jian Sheng-Rui, Lee Jyh-Wei, Juang Jenh-Yih
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.
Micromachines (Basel). 2019 Nov 2;10(11):752. doi: 10.3390/mi10110752.
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 of GaP(100) single-crystal was ~1.7 ± 0.1 MPa·m, which is substantially higher than the values of 0.8 MPa·m and 1.0 MPa·m previously reported for of single-crystal and polycrystalline GaP, respectively.
利用纳米和微米尺度压痕技术研究了GaP(100)单晶的变形行为和断裂特征。使用具有连续接触刚度测量（CSM）模式的Berkovich金刚石压头通过纳米压痕测量硬度和杨氏模量，得到的值分别为12.5±1.2 GPa和152.6±12.8 GPa。此外，在载荷-位移曲线的加载部分观察到特征性的“压入”现象，这是由位错的形核和/或扩展引起的。讨论了一种关于由“压入”事件导致的相关纳米压痕诱导位错数量的能量估计方法。此外，使用光学显微镜观察和分析了GaP(100)单晶的维氏压痕诱导断裂模式。获得的GaP(100)单晶的断裂韧性约为1.7±0.1 MPa·m，这大大高于先前分别报道的单晶和多晶GaP的0.8 MPa·m和1.0 MPa·m的值。
