We are developing new methods of testing mechanical properties at the micron scale, using a combination of focussed ion beam (FIB) machining to produce bend test specimens. A nanoindenter is then used to test the specimens. We are exploring how well elastic, plastic and fracture properties can be extracted from the measured load-displacement data. The methods are being applied to testing individual grains and grain boundaries in polycrystalline metals, and ion-irradiated surface layers.
