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Stress‐Amplitude‐Dependent Deformation Characteristics and Microstructures of Cyclically Stressed Ultrafine‐Grained Copper
Author(s) -
Li X.W.,
Jiang Q.W.,
Wu Y.,
Wang Y.,
Umakoshi Y.
Publication year - 2008
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.200800042
Subject(s) - materials science , microstructure , copper , deformation (meteorology) , amplitude , metallurgy , fracture (geology) , composite material , stress (linguistics) , plasticity , strain (injury) , linguistics , philosophy , physics , medicine , quantum mechanics
Fatigue deformation and fracture behavior of UFG copper produced by ECAP were investigated at different stress amplitudes ranging from 100 MPa to 200 MPa. The fatigue tests were carried out, in fact, in three regimes, i.e. HCF regime, LCF regime and in‐between regime. On cyclic stressing in these three regimes, there are obvious differences in the cyclic response behavior, surface deformation and damage features and corresponding microstructures. This phenomenon is regarded to result from the contributions of plastic component of the total strain amplitude, in different degrees, to the fatigue deformation.