Micro-compression testing: A critical discussion of experimental constraints

摘要: Micro-compression testing is a promising technique for determining mechanical properties at small length scales since it has several benefits over nanoindentation. However, as all new techniques, experimental constraints influencing the results of such micro-mechanical test must be considered. Here we investigate imposed by sample geometry, pile-up dislocations top and base, lateral stiffness setup. Using focused ion beam milling setup, single crystal Cu specimens with different geometries orientations were fabricated. Tapered samples served to influence strain gradients, while stiff coatings undeformable substrates depict dislocation pile-ups these interfaces. The system was reduced placing on needles. Samples loaded using an in situ indenter scanning electron microscope load controlled or displacement mode. observed differences response respect are discussed lead conclusion that controlling most important point.