Dislocation-Based Deformation Mechanisms in Metallic Nanolaminates

摘要

the appeal of nanolayered materials from mechanical viewpoint is that, in principle, plastic deformation can be con- fined to small volumes of material by controlling both the frequency and mag- nitude of obstacles to dislocation motion. As we shall see, the spacing of obstacles Can be used to impart large plastic an- Isotropy and work hardening. However, How strong can such materials be made As layer thickness (and therefore obstacle Spacing) is decreased to the nanoscale Level? In perspective, large, micron-scale, Polycrystalline materials generally dis- Ply improved yield strength (and fracture Toughness) as grain size is decreased.