| Abstract Scope |
Nanoindentation is a popular technique for investigating nanostructured materials. Yet, constant strain rate nanoindentation is usually limited to strain rates ≤ 0.1 /s, which has long prevented investigating ballistic-like conditions, e.g. like those found during a shock or a collision. The limitation to 0.1 /s actually mostly derives from the plasticity error of the continuous stiffness measurements (CSM). It was overcome with a newly introduced evaluation method discarding the need for a measurement of the contact stiffness, which makes it possible to measure hardness values up to ca. 104 /s with a Berkovich indenter. A further step consists in swapping Berkovich for a spherical indenter, so as to capture the full high strain rate yield behavior of a sample at the nanoscale. Spherical indentation is an attractive alternative to micropillar compression, which is hampered by a limited throughput due to the convoluted sample preparation. The talk will discuss its implementation. |