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Microcracks in fatigued FCC polycrystals by interaction between persistent slip bands and grain boundaries
Author(s) -
Dörr G.,
Blochwitz C.
Publication year - 1987
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170220124
Subject(s) - grain boundary , crystallite , lüders band , slip (aerodynamics) , materials science , grain boundary strengthening , condensed matter physics , stress field , composite material , crystallography , geometry , metallurgy , physics , chemistry , microstructure , mathematics , thermodynamics , finite element method
Persistent slip bands (PSB) are zones of high plastic strain localization in fatigued fee metals. They cannot propagate across the grain boundaries of polycrystalline specimens. Consequently, a local stress field should exist near the end of the PSB, “inducing” new PSBs in the neighbouring grain or initiating cracks within the grain boundary. This interaction between PSBs and grain boundaries will be discussed in the present paper. The observed effects may be divided into few characteristic groups, the occurrence of which depends on the geometrical relations between PSB, grain boundary and specimen axis.