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Defect Structure and Properties of Nanomaterials, 2nd Edition by J Gubicza

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Chapter 4

Defect Structure in Low Stacking Fault Energy Nanomaterials

Abstract

In this chapter, the effect of low stacking fault energy (SFE) on a defect structure in nanomaterials is summarized. The low value of SFE leads to a large degree of dislocation dissociation into partials that hinder strongly the cross-slip and climb of dislocations. As a consequence, a relatively large dislocation density develops during severe plastic deformation of low SFE metallic materials. Additionally, the low SFE is accompanied by a small value of twin boundary energy resulting in a significant twinning activity during plastic deformation that alters grain-refinement mechanisms. Among the pure face-centered cubic metals, silver has the lowest SFE. Therefore, the ...

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