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Boundary Strengthening over Five Length Scales
Author(s) -
Hansen N.
Publication year - 2005
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200500102
Subject(s) - grain boundary strengthening , grain boundary , materials science , nanocrystalline material , dislocation , grain size , nanometre , metallurgy , length scale , composite material , nanotechnology , mechanics , microstructure , physics
The strengthening effect of grain boundaries and dislocation boundaries is a traditional metallurgical theme, which at the present time is being revived. The reason is the scientific and industrial interest in strength obtained through a structural refinement. Such a refinement is found in nanocrystalline metals subdivided by grain boundaries and in heavily deformed metals subdivided by a mixture of dislocation boundaries and high angle boundaries. The structural dimension of these materials covers a scale form the nanometre range to the hundreds micrometers level i.e. five length scales. Consequently, a multiscale analysis has been applied to the relationship between strength and the boundary parameters. As an example this analysis suggests that the yield stress/grain size relationship follows the Hall‐Petch relationship down to a grain size of about 15–20 nm showing large potential for strengthening of a metal through a structural refinement.