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Fully dense nanocrystalline tungsten (nc-W) with extremely high strength (∼3.0GPa under quasi-static compression and ∼4.0GPa under dynamic compression) has been obtained by high-pressure torsion (HPT) at low temperature (500°C). The nanocrystalline microstructure is revealed by transmission electron microscopy (TEM). The grain boundaries (GBs) are mostly of the large-angle type. High-resolution TEM...
A micromechanical hysteresis associated with intimate atomic force microscopy (AFM) on the Si(100) surface is discovered using ab initio total energy pseudopotential density functional calculations. It is predicted that it is possible to cycle repeatedly between two buckled configurations of a surface dimer along two different paths, one of which involves a discontinuous change of the equilibrium...
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