Abstract Nanoindentation is a widespread and useful method for evaluating mechanical properties at the sub-micron length scale. However, the indentation size effect remains a major obstacle to obtain meaningful macroscopic mechanical properties from small volume testing. This work systematically addresses the Indentation Size Effect (ISE) phenomenon as a function of temperature and defect density in an austenitic Fe-Cr-Ni alloy (800H) to establish the baseline for nanoindentation testing of ion-irradiated alloys in environmental conditions. The 800H steel sample was irradiated with 70 MeV Fe9+ at 450 °C to the total dose of 20.68 dpa. All samples were tested up to 300 °C in order to quantify the effect of temperature on the indentation size effect. It was found that in all cases, the ISE is less pronounced at high temperatures due to the increase of the plastic zone size. For the same grain orientation, the ISE is less pronounced in the irradiated 800H at all temperatures.

中文翻译：

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高温下未辐照和离子辐照 800H 钢的压痕尺寸效应

摘要 纳米压痕是一种在亚微米长度尺度上评估机械性能的广泛且有用的方法。然而，压痕尺寸效应仍然是从小体积测试中获得有意义的宏观力学性能的主要障碍。这项工作系统地解决了作为奥氏体 Fe-Cr-Ni 合金 (800H) 中温度和缺陷密度函数的压痕尺寸效应 (ISE) 现象，以建立环境条件下离子辐照合金纳米压痕测试的基线。800H 钢样品在 450 °C 下用 70 MeV Fe9+ 辐照，总剂量为 20.68 dpa。所有样品均在高达 300 °C 的温度下进行测试，以量化温度对压痕尺寸效应的影响。结果发现，在所有情况下，由于塑性区尺寸的增加，ISE 在高温下不太明显。对于相同的晶粒取向，在所有温度下的 800H 辐照下，ISE 不太明显。