20:49
Dominik Weil of KLA Instruments presents fun and unusual nanoindentation applications.
16:43
Technically pure cobalt with a phase transformation temperature of 700 K was investigated by high temperature nanoindentation. From the results of constant indentation strain rate experiments as well as strain rate jump tests the rate controlling deformation mechanisms could be derived. For the low temperature hcp phase from room temperature to 450 K a bcc-like deformation behavior was observed, while from 450 K to 700 K it was found that dislocation cross slip bears plasticity. In the high temperature face centered cubic phase cutting of forest dislocations was identified as the dominating...
06:36
In recent years, nanoindentation systems have been developed which can operate at ever higher temperatures in order to characterize the local mechanical properties and thermally activated mechanisms of high temperature materials such as nickel-based superalloys at their operating temperature. In this work a new ultra-high temperature nanoindentation system for testing at up to 1100 °C will be presented. The system is capable to perform indents from small scale up to large indentation depths due to the combination of a 1 N actuator and a high frame stiffness of > 106 N/m even at 1100 °C. ...
