Yes, tungsten needles can be used for nanoindentation in materials science. Nanoindentation is a technique used to study the mechanical properties of materials at the nanoscale, by indenting the material with a small probe and measuring the force-displacement response. Tungsten needles can be used as the probe in this technique, due to their high strength and stiffness, as well as their ability to maintain a sharp tip. The size of the tungsten needle used in nanoindentation depends on the specific requirements of the experiment, but can be as small as a few nanometers in diameter. The use of tungsten needles in nanoindentation has been reported in numerous studies and is considered a reliable and effective method for measuring the mechanical properties of materials at the nanoscale.
