Formation of grains and dislocation structure of geometrically necessary boundaries

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:643

Article

Koster, M.¹  Le, K. C.¹ 

[1] Ruhr Univ Bochum, Lehrstuhl Mech Mat Theorie, D-44780 Bochum, Germany

关键词: Dislocations;    Grain boundaries;    Crystal plasticity;    Single crystal;    Shear;   

DOI  :  10.1016/j.msea.2015.07.027

来源: Elsevier

【 摘 要 】

A continuum dislocation model of formation of grains whose boundaries have a non-vanishing thickness is proposed. For a single crystal deforming in simple shear the lamellar structure of grains with thin layers containing dislocations as the geometrically necessary boundaries turn out to be energetically preferable. The thickness and the energy of this type of grain boundary are computed as functions of the misorientation angle. (C) 2015 Published by Elsevier B.V.

【 授权许可】

Free