Chapter 7

Correlation Between Defect Structure and Mechanical Properties of Nanocrystalline Materials

Abstract

The defect-related mechanical properties of nanomaterials are overviewed. The influence of small grain size on plastic deformation mechanisms, strength, and ductility is discussed. The smaller the grain size in face-centered cubic metals, the higher the activity of twinning at the expense of dislocation glide, while hexagonal close-packed (hcp) materials behave contrarily. The relationship between the dislocation structure and the yield strength is studied in details. Above the grain size of ∼20 nm, the decrease of grain size is accompanied by an increase of yield strength and a decrease of ductility. The loss of ductility can be moderated ...

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