球状压头纳米压痕的校准与数据分析程序
Calibration and data analysis routines for nanoindentation with spherical tips
AI总结：
本研究提出并验证了一套球状纳米压痕的校准与数据分析程序，用于提取应力-应变曲线并评估尺寸效应，为相关研究提供了统一流程。
摘要：
具有连续刚度测量的仪器化球状纳米压痕在材料科学研究中，对脆性和延性材料均日益受到欢迎。这些研究涉及与晶界、孪晶、位错密度、离子诱导损伤等广泛微观物理相关的假设。这些研究依赖于不同的仪器校准方法和规避压头形状缺陷的策略。在本研究中，我们测试、整合并重新调整了已发表的球状压头的压头和机器刚度校准策略。我们提出了一种使用三种参考材料（熔融石英、蓝宝石、玻璃碳）独立校准有效压头半径和机器刚度的程序，这需要将有效半径参数化为载荷的函数。我们针对关键基准（如杨氏模量随深度的变化）验证了我们提出的工作流程。我们将所得的校准应用于具有不同延展性的材料（橄榄石、钛和钨）收集的数据，以提取压痕应力-应变曲线。我们还测试了机器刚度对最近提出的屈服应力识别方法的影响，并比较了不同约定对评估压痕尺寸效应的影响。最后，我们将这些分析程序综合为一个单一工作流程，以供未来旨在提取和处理球状纳米压痕数据的研究使用。
英文摘要：
Instrumented spherical nanoindentation with a continuous stiffness measurement has gained increased popularity in material science studies in brittle and ductile materials alike. These investigations span hypotheses related to a wide range of microphysics involving grain boundaries, twins, dislocation densities, ion-induced damage and more. These studies rely on the implementation of different methodologies for instrument calibration and for circumventing tip shape imperfections. In this study, we test, integrate, and re-adapt published strategies for tip and machine-stiffness calibration for spherical tips. We propose a routine for independently calibrating the effective tip radius and the machine stiffness using three reference materials (fused silica, sapphire, glassy carbon), which requires the parametrization of the effective radius as a function of load. We validate our proposed workflow against key benchmarks, such as variation of Young's modulus with depth. We apply the resulting calibrations to data collected in materials with varying ductility (olivine, titanium, and tungsten) to extract indentation stress-strain curves. We also test the impact of the machine stiffness on recently proposed methods for identification of yield stress, and compare the influence of different conventions on assessing the indentation size effect. Finally, we synthesize these analysis routines in a single workflow for use in future studies aiming to extract and process data from spherical nanoindentation.
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