build amorphous silica structure crystalmaker

In this method, the monocrystalline workpiece is exposed to a high-energy ion beam.

For example, to control the fracture, surface amorphization, which may be achieved through ion implantation, could be performed before the mechanical processes occur.

Besides, an amorphous layer can also be used to facilitate the machining of brittle materials. Due to different mechanical properties, the amorphous layer on the top of the crystalline bulk would affect the machining processes significantly such as ultra-precision turning, grinding, and polishing. Therefore, the crystal being machined in fact has an amorphous-crystalline structure instead of its original lattice. The amorphous structure is believed to be transformed from a metallic phase (β-Sn for Si and Ge) induced by intensive hydrostatic pressure during loading. Amorphization also occurs during nano-cutting or ultra-precision turning. A typical example is the phase transition of covalent crystals (e.g., Si, Ge) during the nanoindentation with fast unloading. Įxcept for the applications of protective coatings and functional surfaces, the layered composite structure is also very common in the mechanical processes on a nanometric scale. It indicated that defects in the material would improve the plasticity. studied the effects of nanostructures including grain boundary and lattice orientation on the hardness of TiC/NbC system. simulated the nanoindentation of TiC/NbC and TiC and discussed the hardness enhancement in the TiC/NbC superlattice. They found that the semi-coherent boundary hindering the dislocation movement played a key role in mechanical hardening. The dislocation evolution in the Al/Ni system was analyzed by Cao et al. The contact stiffness increased with more nickel layers in the specimen, and the specific cutting energy decreased under a high scratch speed. studied the nanoindentation and nanoscratch on the Al/Ni multilayer by molecular dynamics method. In addition, with the great advances in computer science, numerical simulation has become an essential approach to the understanding of the mechanism of material deformation under these loading conditions, especially on the nanometric scale. To study the mechanical properties, nanoindentation and nano-cutting techniques are always employed. Some of these composite structures that are well designed can provide high strength and high wear resistance and are used as protective coatings. Materials with a specific layered structure such as film substrates and multilayer systems have many fascinating features.

Build amorphous silica structure crystalmaker