Maier Verena, Leitner Alexander, Pippan Reinhard, Kiener Daniel
Erich-Schmid-Institute for Materials Science, Austrian Academy of Sciences, Jahnstr. 12, 8700 Leoben, Austria.
Department Materials Physics, Montanuniversität Leoben, Jahnstr. 12, 8700 Leoben, Austria ; Materials Center Leoben, Rosenegger Str. 12, 8700 Leoben, Austria.
JOM (1989). 2015;67(12):2934-2944. doi: 10.1007/s11837-015-1638-7. Epub 2015 Sep 23.
For testing time-dependent material properties by nanoindentation, in particular for long-term creep or relaxation experiments, thermal drift influences on the displacement signal are of prime concern. To address this at room and elevated temperatures, we tested fused quartz at various contact depths at room temperature and ultra-fine grained (ufg) Au at various temperatures. We found that the raw data for fused quartz are strongly affected by thermal drift, but corrected by use of dynamic stiffness measurements all the datasets collapse. The situation for the ufg Au shows again that the data are only useful with drift correction, but with this applied it turns out that there is a significant change of elastic and plastic properties when exceeding 200°C, which is also reflected by an increasing strain rate sensitivity.
对于通过纳米压痕测试随时间变化的材料性能，特别是对于长期蠕变或松弛实验，热漂移对位移信号的影响是首要关注的问题。为了在室温和高温下解决这个问题，我们在室温下对不同接触深度的熔融石英以及在不同温度下对超细晶粒（ufg）金进行了测试。我们发现，熔融石英的原始数据受到热漂移的强烈影响，但通过使用动态刚度测量进行校正后，所有数据集都能吻合。超细晶粒金的情况再次表明，只有进行漂移校正后数据才有用，而应用此校正后发现，超过200°C时弹性和塑性性能会发生显著变化，这也反映在应变率敏感性的增加上。
