Two types of symmetrical copper bicrystals, designated as [(1) over bar 35]/[(1) over bar 35] and [(2) over bar 35]/[(2) over bar 35], were cyclically deformed at constant shear strain amplitudes (gamma(p1)) in the range from similar to 1.7 x 10(-4) to similar to 9.1 x 10(-3). Observations showed that the dislocation structures in the plateau regions of the cyclic stress-strain (CSS) curves of the bicrystals are mainly composed of the ladders of persistent slip bands (PSBs) and the loop patches of matrix. However, additional structure types, such as cells, are present at the high end of plateau in the [(2) over bar 35]/[(2) over bar 35] bicrystal. Above the plateau, the dislocation structures are characterized by cells or labyrinths. The dislocation structures in the vicinity of grain boundary were found to be basically similar to those in the bulk of the fatigued bicrystals. Dislocation-free-zones beside grain boundaries were seldom formed under low strain amplitudes and PSBs were observed to become irregular or taper to a point when approaching to a grain boundary. (C) 1997 Elsevier Science S.A.
部门归属
hu, ym (reprint author), acad sinica,inst met res,state key lab fatigue & fracture mat,shenyang 110015,peoples r china
Y. M. Hu,Z. G. Wang. Dislocation structures in cyclically deformed copper bicrystals[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,1997,234:98-101.
APA
Y. M. Hu,&Z. G. Wang.(1997).Dislocation structures in cyclically deformed copper bicrystals.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,234,98-101.
MLA
Y. M. Hu,et al."Dislocation structures in cyclically deformed copper bicrystals".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 234(1997):98-101.
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